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基于细观非均匀变形的30CrMnSiNi2A扭转疲劳寿命预测

Torsional Fatigue Life Prediction of 30CrMnSiNi2A Based on Meso-Inhomogeneous Deformation.

作者信息

Cen Cheng-Xian, Lu Da-Min, Qin Da-Wei, Zhang Ke-Shi

机构信息

Key Laboratory of Disaster Prevention and Structural Safety/Guangxi Key Lab Disaster Prevention and Engineering Safety, College of Civil and Architectural Engineering, Guangxi University, Nanning 530004, China.

Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China.

出版信息

Materials (Basel). 2021 Apr 8;14(8):1846. doi: 10.3390/ma14081846.

DOI:10.3390/ma14081846
PMID:33917852
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8068275/
Abstract

In this paper, torsional fatigue failure of 30CrMnSiNi2A steel which exhibited non-Masing behavior was studied under different constant shear strain amplitudes, using thin-walled tubular specimens. The relationship between shear fatigue and the evolution of meso-deformation inhomogeneity and the prediction method of the torsional fatigue life curve were investigated. Shear fatigue of the material under constant amplitude was researched by numerical simulation with reference to tests, by using crystal plasticity of polycrystalline representative volume element (RVE) as the material model. Considering the non-Masing behavior of material, when determining the parameter values of the crystal plasticity model the correlation between these parameters and strain amplitude was taken into account. The meso-deformation inhomogeneity with increments in the number of cycles was characterized by using the statistical shear strain standard deviation of RVE as the basic parameter. Considering the effect of strain amplitude on fatigue damage, ratio cycle peak stress/yield stress was taken as the weight to measure the torsional fatigue damage and an improved fatigue indicator parameter (FIP) to measure the inhomogeneous deformation of the material was proposed. The torsional fatigue life curve of 30CrMnSiNi2A steel was predicted by the critical value of the FIP and then the result was confirmed.

摘要

本文采用薄壁管状试样，研究了呈现非马辛行为的30CrMnSiNi2A钢在不同恒定剪应变幅值下的扭转疲劳失效。研究了剪切疲劳与细观变形不均匀性演化之间的关系以及扭转疲劳寿命曲线的预测方法。以多晶代表性体积单元（RVE）的晶体塑性作为材料模型，通过数值模拟并参考试验研究了材料在恒定幅值下的剪切疲劳。考虑到材料的非马辛行为，在确定晶体塑性模型的参数值时，考虑了这些参数与应变幅值之间的相关性。以RVE的统计剪应变标准差为基本参数，表征了随着循环次数增加的细观变形不均匀性。考虑到应变幅值对疲劳损伤的影响，采用循环峰值应力/屈服应力之比作为衡量扭转疲劳损伤的权重，并提出了一种改进的疲劳指标参数（FIP）来衡量材料的不均匀变形。通过FIP的临界值预测了30CrMnSiNi2A钢的扭转疲劳寿命曲线，然后对结果进行了验证。

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本文引用的文献

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