疲劳载荷作用下两条平行裂纹间增强或屏蔽相互作用的测定

Determination of the Enhancement or Shielding Interaction between Two Parallel Cracks under Fatigue Loading.

作者信息

Han Zhichao, Qian Caifu, Tang Lanqing, Li Huifang

机构信息

Department of Chemical Mechanics Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

出版信息

Materials (Basel). 2019 Apr 24;12(8):1331. doi: 10.3390/ma12081331.

DOI:10.3390/ma12081331

PMID:31022883

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6515455/

Abstract

In this paper, the interactions between two parallel cracks are investigated experimentally and numerically. Finite element models have been established to obtain the stress intensity factors and stress distributions of the parallel cracks with different positions and sizes. Fatigue crack growth tests of 304 stainless steel specimens with the single crack and two parallel cracks have been conducted to confirm the numerical results. The numerical analysis results indicate that the interactions between the two parallel cracks have an enhancement or shielding effect on the stress intensity factors, depending on the relative positions of the cracks. The criterion diagram to determine the enhancement or shielding effect between two parallel cracks is obtained. The changes of the stress fields around the cracks have been studied to explain the mechanism of crack interactions.

摘要

本文通过实验和数值模拟研究了两条平行裂纹之间的相互作用。建立了有限元模型，以获得不同位置和尺寸的平行裂纹的应力强度因子和应力分布。对含单裂纹和两条平行裂纹的304不锈钢试样进行了疲劳裂纹扩展试验，以验证数值结果。数值分析结果表明，两条平行裂纹之间的相互作用对应力强度因子有增强或屏蔽作用，这取决于裂纹的相对位置。得到了确定两条平行裂纹之间增强或屏蔽作用的判据图。研究了裂纹周围应力场的变化，以解释裂纹相互作用的机理。