Investigation of tensile, fatigue crack growth behavior and prediction model of EH36 welded joints

作者：Molin Su, WenCai Liu, Hong Yan, Le Kang, Yue Zhao, Chao Feng, Yongdian Han, Lei Zhao · 发表于：Journal of Materials Research and Technology · 年份：2025 · DOI：10.1016/j.jmrt.2025.02.061 · 被引用次数：9 · 研究领域：Fatigue and fracture mechanics、Welding Techniques and Residual Stresses、Hydrogen embrittlement and corrosion behaviors in metals

This paper presented a comprehensive investigation of the tensile properties and fatigue crack growth behavior of EH36 steel joints. Tensile deformation and fracture mechanisms were elucidated using digital image correlation (DIC). For the fatigue property, DIC was developed to predict the growth rate ( da/dN ), providing insights into crack propagation behavior under dynamic loading conditions. Additionally, a novel approach for predicting fatigue damage ( D ) based on the maximum strain ( ε max ) characterized by DIC was established, enabling the assessment of fatigue damage states in EH36 structural components across various stress ratios ( R ). However, DIC showed limitations in addressing initial short crack propagation description, which suggested the need for alternative methods to effectively tackle this challenge.