ZHAO Zhongqiang,CAO Tianye,WANG Hui,et al. Analysis of stress intensity factor at the crack tip based on thermal-mechanical coupling[J]. Journal of Mechanical Strength,2026,48(1):109-115.
ZHAO Zhongqiang,CAO Tianye,WANG Hui,et al. Analysis of stress intensity factor at the crack tip based on thermal-mechanical coupling[J]. Journal of Mechanical Strength,2026,48(1):109-115. DOI: 10.16579/j.issn.1001.9669.2026.01.014.
ANALYSIS OF STRESS INTENSITY FACTOR AT THE CRACK TIP BASED ON THERMAL-MECHANICAL COUPLING
To 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.
Methods
2
The 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.
Results
2
The 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,
K
Ⅰ
is more sensitive to the thermal effect than
K
Ⅱ
. 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.
YANG Dapeng , WANG Junjie , YANG Xinhua , et al . Study on crack propagation rate under fatigue load [J]. Journal of Mechanical Strength , 2017 , 39 ( 1 ): 178 - 182 . (In Chinese)
YUAN Jie , JI Hongchao , SONG Changzhe , et al . Research status of initiation and expansion behavior of gear fatigue cracks [J]. Journal of Mechanical Transmission , 2023 , 47 ( 5 ): 167 - 176 . (In Chinese)
TROLLÉ B , BAIETTO M C , GRAVOUIL A , et al . 2D fatigue crack propagation in rails taking into account actual plastic stresses [J]. Engineering Fracture Mechanics , 2014 , 123 : 163 - 181 .
GLODEŽ S , POTOČNIK R , FLAŠKER J , et al . Numerical modelling of crack path in the lubricated rolling-sliding contact problems [J]. Engineering Fracture Mechanics , 2008 , 75 ( 3/4 ): 880 - 891 .
ANCELLOTTI S , BENEDETTI M , DALLAGO M , et al . Fluid pressurization and entrapment effects on the SIFs of cracks produced under lubricated rolling-sliding contact fatigue [J]. Procedia Structural Integrity , 2016 , 2 : 3098 - 3108 .
SONG Xin . Simulation study on the influence of wave wear characteristics on wheel rolling contact fatigue cracks growth [D]. Beijing : Beijing Jiaotong University , 2020 : 57 - 63 . (In Chinese)
WANG Mengfan , KAN Qianhua , ZHAO Jizhong , et al . Numerical analysis of 3D fatigue crack propagation on rail surface [J]. Chinese Journal of Solid Mechanics , 2023 , 44 ( 3 ): 355 - 367 . (In Chinese)
KO P L , IYER S S , VAUGHAN H , et al . Finite element modelling of crack growth and wear particle formation in sliding contact [J]. Wear , 2001 , 251 ( 1/2/3/4/5/6/7/8/9/10/11/12 ): 1265 - 1278 .
GOSHIMA T , ISHIHAR S , SHIMIZU M , et al . Crack propagation and initiation lives for surface pitting due to rolling/sliding contact [J]. Journal of Thermal Stresses , 2010 , 33 ( 11 ): 1087 - 1106 .
YAN Yutao , QIAN Xiaolin , ZHANG Yibo , et al . Analysis on crack tip J integral value under sliding contact effect [J]. Journal of Northeastern University(Natural Science) , 2016 , 37 ( 12 ): 1744 - 1749 . (In Chinese)
WU Xiaozan , XU Hui , WANG Dezhi . Analysis of the stress intensity factor in unilateral oblique crack [J]. Journal of Hunan University of Arts and Science(Science and Technology) , 2009 , 21 ( 1 ): 23 - 26 . (In Chinese)
ZHANG H Q , SADEGHIPOUR K , BARAN G . Numerical study of polymer surface wear caused by sliding contact [J]. Wear , 1999 , 224 ( 1 ): 141 - 152 .