最新刊期
卷 48 ， 期 1 ， 2026
- 摘要：ObjectiveTo investigate the influence of the microstructure of nanoparticle silver wires on their mechanical and electrical properties, finite element modeling of the microstructure of silver wires was conducted. A force-electric coupling cohesive zone model was established to simulate and analyze the effect of multiscale nanoparticle size distribution on the bending fatigue resistance of silver wires.MethodsFirstly, a random circular packing algorithm was developed to perform stochastic packing modeling of nanoparticles generated based on a normal distribution, enabling finite element modeling of silver wires with different microstructures. Secondly, a force-electric coupling cohesive zone model was employed to characterize the mechanical and electrical damage behavior at particle interfaces. Finally, numerical implementation was carried out using the UEL subroutine in Abaqus software. Finite element simulations were conducted to study the effects of average particle size, particle size standard deviation, and bimodal particle size distribution on the resistance variation and service life of nanoparticle silver wires during fatigue loading.ResultsThe results indicate that the bending fatigue resistance of silver wires significantly improves with increasing particle size standard deviation, while changes in average particle size have a minor effect on performance. For silver wires with bimodal particle size distributions, small particles effectively enhance bending fatigue resistance by filling the gaps between large particles. However, as the proportion of small particles increases, the performance improvement gradually diminishes. Additionally, an increase in the size of small particles impedes effective bonding between large particles, thereby reducing the enhancement effect on the bending fatigue resistance of silver wires.关键词：Nanoparticle;Multi-scale distribution;Cohesive zone model;Electrical damage;Fatigue34|1|0更新时间：2026-01-21
- 摘要：ObjectiveIn order to enhance the load-bearing performance of face gear transmission and reduce its sensitivity to installation misalignment, a high-order segmented topological modification method based on a predefined contact path was proposed.MethodsFirstly, 2nd-order and 4th-order segmented modification functions were designed along the predefined contact path of the pinion and the instantaneous contact line direction, respectively. Based on the surface superposition method, the equation of the modified tooth surface was established. Subsequently, the tooth contact analysis (TCA) equation incorporating installation errors was derived. The influence of parameters such as predefined contact path angle, modification length, modification curve order, and maximum modification amount on the contact characteristics of face gear pair under different installation error conditions was investigated. Finally, a comparative analysis of the load-bearing contact characteristics of the face gear pair under different modification functions and modification amounts was conducted using the finite element method.ResultsThe calculation results show that compared to 2nd-order modification, the 4th-order modification method reduces the contact stresses of the tooth surface and the error amplitude of load-bearing transmission. Furthermore, the contact trace extends from the root of the inner diameter tooth of the face gear to the tip of the outer diameter tooth. The high-order segmented modification method can reduce the sensitivity of the face gear pair to installation errors, optimize the load distribution of the tooth surface, and enhance meshing performance.关键词：Face gear pair;Topological modification;Loaded tooth contact analysis;Meshing performance;Installation error61|44|0更新时间：2026-01-21
- 摘要：ObjectiveThe effects of different joining processes—riveting, spot welding, argon arc welding, and laser welding—on the compressive buckling behavior and failure modes of TC2 titanium alloy stiffened panels were investigated.MethodsIntegral stiffened panels were designed and fabricated for compression testing to determine buckling loads, failure loads, and failure modes. Analytical buckling theories and finite element (FE) models using solid elements were employed to analyze the buckling and post-buckling behaviors, with numerical results compared against test data.ResultsThe results indicate that while welded panels exhibit significantly higher buckling and failure loads than riveted and spot-welded panels, the latter shows a higher failure-to-buckling load ratio. Failure in riveted and spot-welded panels is characterized by global buckling, whereas welded panels fail due to local buckling involving skin bulging and rib torsion. The FE simulations show good agreement with test values, with errors within 10%, effectively capturing the rib torsion and skin deformation details.关键词：Welding process;Stiffened integral panel;Compression test;Buckling analysis;Failure mode11|0|0更新时间：2026-01-21
- 摘要：ObjectiveBased on the fact that the quality of cold extrusion strengthening is closely related to the selection of process parameters, this study investigates the effects of different process parameters on the residual stress and fatigue life of 7050 aluminum alloy lug holes after cold extrusion strengthening.MethodsFirstly, the distribution and variation of residual stress in 7050-T7451 aluminum alloy lug holes with PH13-8Mo pressed-in bushings after cold extrusion strengthening were explored by using the finite element method. The validity of the established finite element model was confirmed through energy methods and pull-out force tests. Subsequently, the influence patterns of different process parameters on the fatigue life of lug holes were explored based on the finite element fatigue analysis software FE-Safe. Finally, fatigue tests were conducted to verify the reliability of the simulation model and results.ResultsThe results indicate that both excessively large and small fillet radii of the mandrel transition are detrimental to improving the fatigue life of the lug holes. When the fillet radius of the mandrel transition is approximately 2 mm, the fatigue life of the lug holes is maximized. With the increase of the bushing reaming allowance, the fatigue life of the lug holes first increases and then decreases, reaching the longest fatigue life at a reaming allowance of about 0.8 mm. Additionally, the larger the installation clearance between the hole and the bushing, the shorter the fatigue life of the lug holes.关键词：Cold extrusion strengthening;Finite element simulation;FE-SAFE;Residual stress;Fatigue life10|0|0更新时间：2026-01-21
- 摘要：ObjectiveAiming at the problems of long cycle, high cost of traditional group method for testing metal fatigue S-N curves and insufficient targeting of existing infrared thermographic correlation models, a fatigue life prediction method based on intrinsic damage dissipation was proposed to achieve rapid and accurate determination of S-N curves.MethodsFirstly, an intrinsic damage dissipation characterization model was derived based on continuum damage mechanics and irreversible thermodynamics. Secondly, a fatigue life prediction model was constructed by combining the correlation assumption between temperature rise and fatigue damage. Finally, infrared thermographic tests were conducted with aluminum alloy 2A12 as the research object, and the predicted S-N curves were compared with the results of the group method for verification.ResultsThis method only required a single sample to complete the test, and the obtained S-N curves are highly consistent with those of the group method, which verified the effectiveness of the model. It significantly reduced the test cost and cycle, providing an efficient scheme for the determination of metal fatigue S-N curves.关键词：Metal fatigue;S-N curve;Life prediction;Infrared thermographic technique;Intrinsic damage dissipation5|0|0更新时间：2026-01-21
- 摘要：ObjectiveAiming at the string strength failure problem induced by the packer system during multi-stage fracturing, the investigation on the mechanical behavior of the string and the influence law of strength was carried out to ensure the safety of fracturing operations and the structural reliability of the string.MethodsFirstly, based on the working characteristics of multi-stage packers, a mechanical model of the fracturing string system was established, and the governing equations under the two working conditions of setting and fracturing were derived. Secondly, the finite element method was adopted, and the packer displacement was taken as the initial boundary condition of the fracturing working condition. Then, the non-deterministic boundary conditions of packer sliding and fixing were considered, and a numerical calculation method for the multi-stage fracturing string system was constructed. Finally, calculation and analysis were carried out through field well cases.ResultsThe analysis results showed that with the increase of fracturing stages, the wellhead axial force and equivalent stress increased significantly, and the safety factor decreased gradually; the fracturing fluid flow rate, wellhead pressure and proppant concentration all had significant effects on the string strength; the increase of any parameter would lead to the increase of axial force and the decrease of safety factor, thereby aggravating the risk of string strength failure. The research results provided a basis for the strength design and safety evaluation of multi-stage fracturing strings.关键词：Finite element method;Pipe element;Multi-stage fracturing;Strength of tubular column6|0|0更新时间：2026-01-21
- 摘要：ObjectiveTo clarify the influence of different initial crack shapes on the fatigue life of sucker rods, crack propagation simulation and residual useful life (RUL) prediction were conducted on sucker rods in corrosive environments using FRANC3D fracture mechanics software.MethodsFirstly, the simulation accuracy of the M-integral method for calculating stress intensity factors was verified by comparing with the Newman-Raju solution. Secondly, a finite element model of in-service sucker rods was established based on Ansys WorkBench software and simulation analysis was conducted. The maximum von Mises stress was found at the intersection of the cutting groove and the shoulder. Finally, the secondary development of FRANC3D software was carried out based on the Python interface, and crack propagation simulations were conducted respectively on semi-elliptical and long-shallow surface cracks in non-corrosive and corrosive environments.ResultsThe results show that both types of cracks propagate rapidly from the middle to both ends initially. When the crack extends to a certain depth, the front edge of the crack gradually becomes elliptical, reducing its impact on the subsequent crack propagation rate. The RUL under corrosive conditions is reduced by 28.95% and 28.32%, respectively, compared to non-corrosive conditions. This study provides reference for predicting the residual life of in-service sucker rods.关键词：Fracture mechanics;Crack propagation;Crack shape;Residual useful life;Sucker rod6|0|0更新时间：2026-01-21
- 摘要：ObjectiveEH36 and EH690 high-strength steels are widely used in offshore platforms, but their dissimilar welded joints have poor fatigue resistance and are prone to fracture failure. This study aims to investigate the fatigue crack propagation behavior and life characteristics of these welded joints under different stress ratios, providing a theoretical basis for safety assessment and fatigue design of marine steel structures.MethodsFirstly, welded joints of EH36 and EH690 dissimilar steels were prepared using gas metal arc welding (GMAW), and standard compact tension specimens were machined. Secondly, fatigue crack propagation tests were conducted on the weld zone, heat-affected zone , and EH36 base metal under three stress ratios (R=0.1, 0.3, 0.5). Thirdly, the fatigue crack growth rates were calculated based on test data, and material constants C and m were obtained by fitting the Paris formula. Finally, the microscopic morphology of fatigue fractures was analyzed using scanning electron microscopy (SEM).ResultsThe results show that for the same crack propagation distance, the number of fatigue cycles increases with the yield strength of the material. The welding residual tensile stress in the heat affected zone (HAZ) increases the mean stress level of the cyclic stress, thereby increasing the fatigue crack growth rate and reducing the fatigue life of the component. The fracture surface exhibits quasi-cleavage characteristics.关键词：EH36 steel;EH690 steel;Stress ratio;Fatigue crack growth;Micro-morphology7|0|0更新时间：2026-01-21
- 摘要：ObjectiveTo address the challenges in fatigue strength prediction caused by limited data and high-dimensional feature space, a method combining mutual information feature selection and recursive feature elimination (MIFS-RFE) is proposed.MethodsFirstly, MIFS was used to identify crucial features for prediction. Subsequently, the remaining features were processed in the RFE stage. Through an iterative process, the most informative features were selected to ensure accurate fatigue strength prediction. The finalized feature subset was input into random forest regression (RFR), K-nearest neighbors regression (KNN), support vector regression (SVR), and multilayer perceptron (MLP) models for performance analysis.ResultsAfter optimization, the feature dimensionality was reduced from 25 to 13. During the test process, RFR, KNN, SVR, and MLP achieved R2 values of 0.977 7, 0.972 5, 0.961 3, and 0.976 6, respectively. Compared with the test results of all features, the proposed method increased the maximum R2 of the model by 0.020 8. Finally, based on the SHAP value, the influence of effective features was analyzed, and the effectiveness of the combination of MIFS and RFE was validated. The results indicate that the proposed method maintains high performance while reducing feature dimensionality, offering an optimized solution for fatigue strength prediction.关键词：Fatigue strength;Mutual information feature selection;Recursive feature elimination;Machine learning;Optimal feature subset6|1|0更新时间：2026-01-21
- 摘要：ObjectiveTo reveal the influence law of grinding parameters on the residual stress of spiral bevel gear tooth surfaces, solve the problem of insufficient research on the correlation mechanism between process parameters and residual stress in existing studies, and further optimize the grinding process to improve the load-carrying capacity and service life of gears.MethodsFirstly, a finite element model of single abrasive grain grinding for spiral bevel gears was established based on Abaqus software, with the Johnson-Cook constitutive model and failure criterion adopted. Secondly, the influences of grinding speed, grinding depth and abrasive rake angle on residual stress were analyzed through single-factor simulation. Then, a residual stress prediction model was constructed by combining the response surface methodology, and the reliability of the model was verified by analysis of variance. Finally, multi-objective parameter optimization was conducted based on the reliable model, and comparative tests were carried out for verification.ResultsThe results showed that the residual stress of the tooth surface distributed along the layer depth as “compressive stress-maximum compressive stress (subsurface)-tensile stress-approaching zero”. The influence degree of each parameter on residual stress was ranked as abrasive rake angle>grinding depth>grinding speed. Under the optimal parameters (grinding speed 25 m/s, grinding depth 0.01 mm, abrasive rake angle -48°), the maximum residual compressive stress of the tooth surface reached 638.6 MPa, and the minimum residual tensile stress was 24.9 MPa. This result can provide a basis for the optimization of gear grinding processes.关键词：Single abrasive;Spiral Bevel Gear;Grinding residual stresses;Response surface methodology;Optimization5|1|0更新时间：2026-01-21
- 摘要：ObjectiveAiming at the residual stress problem in micro-electro-mechanical system (MEMS) films, research on the dynamic performance of micro-membrane with residual stress was conducted.MethodsFirstly, a mathematical model of thin micro-plates with residual stress was established. The influence law of residual stress on the natural frequency and vibration mode of micro-membrane was studied, and the influence of residual stress on the transition of behavioral characteristics between plates and films was discussed. Then, the stability of micro-membrane with residual stress was studied based on the minimum potential energy principle. Measures for preventing the buckling of micro-membrane were proposed, and the vibration response of micro-membrane under harmonic excitation was analyzed.ResultsThe results show that residual stress could induce the transition of behavior between plates and films; it has a significant impact on natural frequency but a slight effect on vibration mode. The instability of micro-membrane could be effectively prevented by adjusting the structural parameters and preparation process of the films. Moreover, the influences of residual stress on the natural frequency and vibration displacement of micro-membrane presented opposite variation trends. The research results have important reference significance and application value for the development of MEMS based on micro-membrane structures.关键词：Micro-membrane;Residual stress;Micro-electro-mechanical system;Dynamics;Stability17|0|0更新时间：2026-01-21
- 摘要：ObjectiveTo solve the problems that 42CrMo4 steel (commonly used in mechanical components bearing dynamic loads) has reduced service life due to residual tensile stress and is susceptible to corrosion in harsh environments, the regulatory effect of ultrasonic impact treatment on its surface residual stress and electrochemical properties was investigated.MethodsFirstly, 42CrMo4 steel samples were treated with ultrasonic impact for 0, 4, and 8 minutes (current 2.0 A, frequency 40 kHz). Secondly, their microstructures were characterized by a ultra-depth-of-field 3D digital microscope, and their microhardness was tested by a microhardness tester. Then, their residual stress was measured by the small hole method. Finally, their electrochemical properties (polarization curves, impedance spectra) were tested using a three-electrode system (3.5% NaCl solution).ResultsThe results showed that ultrasonic impact caused plastic deformation and grain refinement on the surface of the samples;at 8 minutes, the average surface hardness reached 262.9 HV (14.3% higher than the initial value), the residual tensile stress was converted to compressive stress and increased with treatment time, and the maximum residual compressive stresses in the x and y axes at 8 minutes were -204.2 MPa and -121.5 MPa, respectively;at 8 minutes, the corrosion current density was reduced to 12% of that of the untreated sample, showing the best corrosion resistance. The synergistic effect of grain refinement, plastic deformation and residual compressive stress was the key mechanism for performance improvement.关键词：Ultrasonic impact treatment;Microstructure;Microhardness;Residual stress;Electrochemistry50|72|0更新时间：2026-01-21
- 摘要：ObjectiveAims to investigate the lack of test data and microscopic mechanism analysis of 60Si2CrV spring steel under high-temperature tempering. A systematic comparison was conducted between medium-temperature (420 ℃) and high-temperature (580 ℃) tempering.MethodsMultidimensional test methods, including uniaxial tensile, impact, three-point bending fatigue, and hardenability tests, were employed to evaluate mechanical properties. Microstructures and fractures were observed via SEM to clarify the strengthening and toughening mechanisms.ResultsThe results indicate that medium-temperature tempering yields high strength but low ductility and toughness. High-temperature tempering significantly enhances plastic deformation and impact toughness. Notably, the fatigue ultimate strength of high-temperature tempered samples reaches 951.6 MPa, 11.6% higher than that of medium-temperature samples (853.4 MPa). Microstructural analysis shows typical tempered troostite after medium-temperature tempering and tempered sorbite after high-temperature tempering. The latter achieves a superior balance of strength, plasticity, and toughness.关键词：60Si2CrV;Spring steel;Tempering;Mechanical property;Hardenability10|0|0更新时间：2026-01-21
- 摘要：ObjectiveTo clarify the failure mechanism and influencing factors of contact fatigue， improve the fatigue resistance of mechanical parts， and extend the fatigue life， research on the initiation and propagation mechanism of surface cracks under contact fatigue was carried out.MethodsThe influencing factors of the stress intensity factor at the crack tip under sliding contact thermo-mechanical coupling were analyzed by the finite element method and fracture mechanics theory. The variation rules of the stress intensity factor under different pressure loads， friction coefficients， crack lengths， crack angles， and sliding velocities were obtained.ResultsThe results show that the crack belongs to the Ⅰ-Ⅱ compound crack. The mode of crack changes from Ⅰ to Ⅱ as the sliding block approaches the crack. The thermal effect can suppress Ⅰ and Ⅱ expansion， and the more significant the thermal effect is， the stronger the inhibition is. However， KⅠ is more sensitive to the thermal effect than KⅡ. The compound crack propagation intensifies with the increase of pressure load and crack angle. The mode Ⅰ extension intensifies while mode Ⅱ decreases when the friction coefficient increases. The mode Ⅰ extension decreases， and the mode Ⅱ extension increases when the crack length increases. Both mode Ⅰ and Ⅱ extensions become weak with the increase of sliding speed.关键词：Solid mechanics;Sliding contact;Thermo-mechanical coupling;Crack;Stress intensity factor;Finite element method6|0|0更新时间：2026-01-21
- 摘要：ObjectiveIn response to the high braking performance requirements for extended tracks, the friction discs with high friction coefficient and the large brake chambers were utilized to enhance the braking force. The temperature field, stress field and fatigue life of the improved brake under typical braking conditions were analyzed.MethodsA 3D thermo-mechanical coupling model of the drum brake was established using the Ansys finite element simulation software. The accuracy of the simulation model was validated through bench test, and the fatigue life of the brake drum was predicted using the Manson-Coffin model.ResultsThe results indicate that the temperature rise of the brake drum significantly increases the stress, with both the temperature and stress of the brake drum being higher under the continuous braking condition compared to the single braking condition. During braking, due to the plastic deformation of the brake drum, the stress distribution on the surface of the friction discs is non-uniform, affecting the braking stability and reducing the fatigue life of the drum brake. Test results demonstrate that the braking performance of the entire vehicle has been significantly improved.关键词：Drum brake;Thermo-mechanical coupling;Temperature field;Stress field;Fatigue life prediction6|0|0更新时间：2026-01-21
- 摘要：ObjectiveTo address the difficulties in obtaining load data for traditional steering systems under real-world customer usage conditions, which hinders effective support for reliability design and test evaluation, a rapid prediction method for global loads of steering systems based on vehicle trajectory was proposed.MethodsFirstly, a two-degree-of-freedom lateral dynamics model and a steering system mechanical model were established. Secondly, utilizing vehicle GPS trajectory data, the turning curvature was calculated employing the Haversine formula. Then, the yaw rate and sideslip angle were derived inversely, followed by the calculation of the lateral force and aligning torque. Finally, by integrating the mechanical relationships of the steering system, rapid predictions of the steering wheel angle, tie-rod displacement， and steering tie-rod force were achieved. The model accuracy was verified under extreme conditions, and the influence laws of turning curvature and vehicle speed on load characteristics were analyzed.ResultsThe research demonstrates that the proposed method can effectively predict the key loads of the steering system, with the prediction error for the steering wheel angle being less than 3.5%. The loads increase significantly with the increase in turning curvature and vehicle speed. The influence of turning curvature on the steering tie-rod force is particularly prominent, showing a nonlinear growth trend in the high curvature range. This method can provide effective support for the reliability evaluation of steering systems under customer usage conditions and the load design for bench tests.关键词：Steer-By-Wire system;GPS trajectory data;Turning curvature;Load;Fast prediction10|0|0更新时间：2026-01-21
- 摘要：ObjectiveTo detect faults in the generator bearings of offshore wind turbines in a timely manner, a DBO-XGBoost prediction model for predicting generator bearing temperature was proposed based on the dung beetle optimizer (DBO) algorithm and eXtreme Gradient Boosting (XGBoost) model. Combined with the exponentially weighted moving average (EWMA) control chart, this model enables fault prediction for generator bearings.MethodsFirst, key features that can accurately characterize the operational status of generator bearings were selected from the supervisory control and data acquisition (SCADA) system by means of the maximal information coefficient (MIC), and these features were then fed into the DBO-XGBoost model to predict the generator bearing temperature under normal operating conditions. Second, the deviation between the actual values and the predicted values was quantified using the mahalanobis distance (MD), and the MD sequence was input into a change-point detection algorithm based on the exponentially weighted moving average (EWMA) control chart to identify the change points corresponding to fault occurrences， thereby enabling fault prediction. Finally, a knowledge graph for bearing fault modes was constructed on the basis of feature importance.ResultsThe results demonstrate that this method can achieve relatively accurate prediction of generator bearing temperature under normal operating conditions and issue early fault warnings 3 days in advance. Compared with the fault warning method relying on setting a single threshold, this method can detect the time of fault occurrence with higher accuracy. In addition, the fault modes knowledge graph constructed for bearing provides visualized operation and maintenance decision support for operations personnel.关键词：Offshore wind turbine;Dung beetle optimization algorithm;Generator bearing;Fault prediction;Exponentially weighted moving average7|0|0更新时间：2026-01-21
- 摘要：ObjectiveTo address the challenge of directly measuring the contact load of large wind turbine tapered roller bearings, the main shaft bearing of a specific model wind turbine is taken as an example to implement intelligent modifications on the bearing rollers.MethodsFirstly, a load sensor and its associated circuitry were installed within a hollow roller to develop an intelligent roller designed for measuring contact load, along with corresponding load sensors. Secondly, finite element simulations were conducted to derive the radial strain distribution pattern of the metallic disc within the load sensor, followed by virtual bridge assembly simulations. Finally, experimental validation was performed to confirm the radial strain distribution pattern of the metallic disc and sensor calibration tests were conducted.ResultsThe results indicate that when subjected to fixed loads, the proposed bridge assembly method effectively mitigates the influence of roller rotation angle on load measurement, allowing for stable voltage output during roller rotation. The proposed measurement methodology provides a novel approach for obtaining contact loads in large tapered roller bearings.关键词：Tapered roller bearing;Intelligent roller;Contact load measurement;Sensor design57|54|0更新时间：2026-01-21
- 摘要：ObjectiveOffshore wind turbines are exposed to the risk of collision with vessels, where the effect of wind loads cannot be ignored. However, existing studies tend to adopt steady-state wind loads, which are inconsistent with actual conditions.MethodsBy adopting transient wind loads that are more consistent with actual working conditions, the collision processes between three types of offshore wind turbines and vessels under various wind speeds and directions were simulated using the Ls-Dyna software, and the dynamic responses, crashworthiness, and their influencing factors of the wind turbine foundations during the collision were analyzed.ResultsThe results show that the monopile foundation wind turbine exhibits the worst crashworthiness and the highest sensitivity to loads, while the jacket foundation wind turbine achieves the best overall crashworthiness. Compared with wind speed and direction, vessel speed has a more significant impact on the structural safety of wind turbines. When the vessel speed is not more than 4 m/s, wind turbines can still operate normally under the rated wind speed but with certain potential safety hazards. Once the vessel speed exceeds 4 m/s, the wind turbines will suffer severe structural damage. After a collision occurs, the kinetic energy of the wind turbine tower top increases with the increase of wind loads; the center of gravity of the tower top may deviate from the safe zone, leading to a risk of overturning. In addition, the wind turbine sustains the maximum structural damage when the vessel sails downwind, whereas the minimum structural damage occurs when the vessel sails upwind.关键词：Offshore wind turbine;Wind load;Wind direction;Vessel;Crashworthiness11|0|0更新时间：2026-01-21
·Fatigue·Damage·Fracture·Failure Analysis·
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