I型和混合模式（I+II）加载下紧凑拉伸试样的数值疲劳裂纹扩展

Numerical Fatigue Crack Growth on Compact Tension Specimens under Mode I and Mixed-Mode (I+II) Loading.

作者信息

Martins Rui F, Xavier José, Caldeira João

机构信息

UNIDEMI, Department of Mechanical and Industrial Engineering, NOVA School of Science and Technology, Universidade NOVA de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal.

Intelligent Systems Associate Laboratory (LASI), 4800-058 Guimarães, Portugal.

出版信息

Materials (Basel). 2024 Sep 18;17(18):4570. doi: 10.3390/ma17184570.

DOI:10.3390/ma17184570

PMID:39336311

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11433036/

Abstract

This study focused on standard Compact Tension (CT) specimens and two loading modes during the numerical analyses carried out, namely: pure mode I and mixed-mode loading (Modes I+II). Numerical stress intensity factors, K, were calculated using Abaqus 2022 and compared with those given analytically under pure mode I loading, showing very good agreement. Additionally, K, K, and K results obtained from Abaqus were presented for mixed-mode loading, analyzing crack growth and variation through the thickness of the CT specimen. Moreover, fatigue crack growth simulations under mode I loading were conducted on standard CT specimens using the Extended Finite Element Method (XFEM) and the Paris Law parameters of an AISI 316L stainless steel. It was shown that XFEM effectively determines crack propagation direction and growth, provided that an appropriate mesh is implemented.

摘要

本研究聚焦于标准紧凑拉伸（CT）试样以及在进行数值分析时的两种加载模式，即：纯I型模式和混合模式加载（I + II型模式）。使用Abaqus 2022计算数值应力强度因子K，并将其与纯I型模式加载下的解析值进行比较，结果显示出非常好的一致性。此外，还给出了Abaqus在混合模式加载下获得的K₁、K₂和K₃结果，分析了CT试样厚度方向上的裂纹扩展和变化情况。此外，使用扩展有限元法（XFEM）和AISI 316L不锈钢的巴黎定律参数，对标准CT试样进行了I型模式加载下的疲劳裂纹扩展模拟。结果表明，只要实施合适的网格划分，XFEM就能有效地确定裂纹扩展方向和扩展情况。