江南大学 机械工程学院 江苏省食品先进制造装备技术重点实验室,无锡 214122
杜阿龙,男,1999年生,安徽阜阳人,在读硕士研究生;主要研究方向为晶体塑性有限元;E-mail:2387230844@qq.com。
收稿:2025-02-13,
修回:2025-03-05,
纸质出版:2025-12-15
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杜阿龙,于培师,赵宇翔,等. 基于微结构特征的Ti6Al4V ELI钛合金疲劳裂纹萌生寿命晶体塑性预测方法[J]. 机械强度,2025,47(12):1-17.
DU Along,YU Peishi,ZHAO Yuxiang,et al. Crystal plasticity prediction method for fatigue crack initiation life of Ti6Al4V ELI titanium alloy based on microstructure characteristics[J]. Journal of Mechanical Strength,2025,47(12):1-17.
杜阿龙,于培师,赵宇翔,等. 基于微结构特征的Ti6Al4V ELI钛合金疲劳裂纹萌生寿命晶体塑性预测方法[J]. 机械强度,2025,47(12):1-17. DOI: DOI:10.16579/j.issn.1001.9669.2025.12.001.
DU Along,YU Peishi,ZHAO Yuxiang,et al. Crystal plasticity prediction method for fatigue crack initiation life of Ti6Al4V ELI titanium alloy based on microstructure characteristics[J]. Journal of Mechanical Strength,2025,47(12):1-17. DOI: DOI:10.16579/j.issn.1001.9669.2025.12.001.
Ti6Al4V ELI钛合金因其优异的力学性能而广泛应用于深海载人装备的重要结构中。然而,载人装备在深海服役期间,持续承受复杂的疲劳载荷,这极易导致裂纹的萌生与扩展,极端情况下甚至可能引发灾难性的断裂事故。裂纹萌生是决定整体疲劳寿命的关键因素,对其进行精确预测是确保装备安全性的关键。尽管现有的疲劳寿命分析方法已经能够在一定程度上揭示Ti6Al4V ELI钛合金的疲劳行为特征,但在预测不同微观结构材料的寿命时,其准确性仍显不足。为了解决该问题,借助电子背散射衍射(Electron Back Scatter Diffraction
EBSD)技术进行了真实微观结构模型的重构,基于晶体塑性有限元方法进行了数值模拟,构建了针对Ti6Al4V ELI钛合金的疲劳裂纹萌生寿命预测模型,模拟了双相结构Ti6Al4V ELI钛合金的低周疲劳行为,并引入了累积塑性滑移和累积能量耗散2种疲劳指示因子(Fatigue Indicator Parameters
FIPs),以全面评估疲劳过程中的损伤程度。研究结果表明,疲劳损伤主要集中在塑性滑移严重和能量耗散高的区域,特别是α相与β相的界面位置。此外,晶粒内部的拉压不对称性导致晶格旋转,进而加剧了应变的局部化,加速了微观结构的演变。通过与试验寿命数据的对比发现,基于累积塑性滑移的寿命预测方法相较于基于累积能量耗散的预测方法展现出更高的准确性。同时,与传统的Coffin-Manson(C-M)模型相比,基于疲劳指示因子的预测方法更好地揭示了不同微观结构Ti6Al4V ELI钛合金寿命的差异性。研究不仅为提高Ti6Al4V ELI钛合金疲劳裂纹萌生寿命预测的准确性提供了新的思路和方法,同时也为该材料在实际应用中的安全性和可靠性提供了有力的支持。
Ti6Al4V ELI titanium alloy is widely used in important structures of deep-sea manned equipment due to its excellent mechanical properties. However
during deep-sea service
manned equipment is continuously subjected to complex fatigue loads
which can easily lead to crack initiation and propagation
and in extreme cases
may even lead to catastrophic rupture accidents. Crack initiation is a key factor in determining the overall fatigue life
and accurate prediction of it is essential to ensure the safety of the equipment. Although existing fatigue life analysis methods have been able to reveal the fatigue behavior characteristics of Ti6Al4V ELI titanium alloys to a certain extent
their accuracy is still insufficient when predicting the life of materials with different microstructures. To solve this problem
a realistic microstructure model was reconstructed using electron back scatter diffraction (EBSD) technology
the numerical simulations were conducted based on the crystal plasticity finite element method
and a fatigue crack initiation life prediction model for Ti6Al4V ELI titanium alloy was successfully established. The low-cycle fatigue behavior of dual-phase structured Ti6Al4V ELI titanium alloy was simulated
and two fatigue indicator parameters (FIPs)
cumulative plastic slip and cumulative energy dissipation
were introduced to comprehensively assess the extent of damage during fatigue. The results show that the fatigue damage is mainly concentrated in the regions with severe plastic slip and high energy dissipation
especially at the interface location between the α-phase and β-phase. In addition
the tensile asymmetry within the grains leads to lattice rotation
which further exacerbates strain localization and accelerates the evolution of microstructure. By comparing with the experimental lifetime data
it is found that the lifetime prediction method based on cumulative plastic slip exhibits higher accuracy compared with the lifetime prediction method based on cumulative energy dissipation. Meanwhile
the fatigue indicator parameter-based prediction method better reveals the variability of the life of Ti6Al4V ELI titanium alloys with different microstructures compared with the conventional Coffin-Manson (C-M) model. This study not only provides new ideas and methods to improve the accuracy of fatigue crack initiation life prediction for Ti6Al4V ELI titanium alloy
but also provides strong support for the safety and reliability of this material in practical applications.
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