薄板件自然疲劳裂纹扩展SBFEM仿真方法（英文）  

Simulation of Natural Fatigue Crack Propagation in Thin-walled Structures Using SBFEM

作　　者：李翰超 杜平安 杨丹[2] 于亚婷 刘建涛 LI Han-chao;DU Ping-an;YANG Dan;YU Ya-ting;LIU Jian-tao(School of Mechanical and Electrical Engineering,University of Electronic Science and Technology of China Chengdu 611731;School of Mechanical Engineering,Southwest Jiaotong University Chengdu 610031)

机构地区：[1]电子科技大学机械与电气工程学院,成都611731 [2]西南交通大学机械工程学院,成都610031

出　　处：《电子科技大学学报》2020年第1期13-21,共9页Journal of University of Electronic Science and Technology of China

基　　金：National Key R&D Program of China(2017YFB0703200);National Natural Science Foundation of China(51972268,51305362,51775459)~~

摘　　要：自然疲劳裂纹扩展(NFCG)对关键部件的整体寿命有着重要影响,且机理复杂,几十年来被广泛研究。该文首先引用了基于疲劳裂纹扩展现象观察的NFCG模型,并利用比例边界有限元(SBFEM)方法模拟NFCG现象,提出了一种计算策略,预测不同厚度试样在不同循环加载条件下的疲劳寿命。本工作所建立的仿真策略可深入探讨加载条件、试件厚度和材料特性对自然疲劳裂纹扩展过程的影响,为实际试件设计、材料选择和涡流检测提供了有益的工具。Natural fatigue crack growth(NFCG) has been investigated extensively for decades due to its significant influence on the overall life of key components and the complex mechanism involved. In this study, a NFCG model based on the phenomenological observations of fatigue crack growth is first invoked, and a computational strategy is developed in the scaled boundary finite element method(SBFEM) context to simulate the NFCG phenomenon and to predict the fatigue life of specimen with different thicknesses under various cyclic loading conditions. The effects ascribed to the loading conditions, specimen thickness and material properties on the NFCG can be investigated in detail with the our elaborated strategy, which provides a helpful tool for practical specimen design, material selection and eddy current testing.

关 键 词：试验测试 加载作用 自然裂纹扩展 数值模拟 比例边界有限元 

分 类 号：TB114.3[理学—概率论与数理统计]