摘要
为快速地估算拉伸过载作用下裂纹张开应力,本文提出基于裂纹最大张口位移变化量来计算裂纹张开应力方法。针对单次过载、多次连续过载,考虑了过载比、应力比、材料特性的影响,通过弹塑性有限元分析建立中心穿透裂纹张开应力与最大张口位移变化量的函数关系,该函数关系适用于不同形式的连续拉伸过载的硬化金属材料;对于间断过载,量化分析了过载距离对裂纹扩展的影响,发现当过载距离等于0.233倍,高载塑性区时迟滞效应最强,为获得最佳迟滞效果提供了有效的施加方案。
To obtain crack opening stress （trop） under tensile overloading quickly, an approach was proposed to determine σop based on the variable quantity of maximum crack opening displacement （VMCOD）. On the basis of elastic-plastic finite element analysis, the functional relationship between σop and VMCOD of a center-cracked specimen was established to determine the effects of stress ratio, overload ratio, and material properties. The relationship was applicable for determining σop of metallic hardening materials under multiple overloads. For the intermittent overload, the effect of distance between overloads on crack propagation was investigated. Results show that the maximum retardation occurred when the distance between overloads was 0. 233 times that of the high-load plastic zone. Thus, the proposed approach was an effective scheme for obtaining optimum retardation.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2018年第1期10-15,共6页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(51579039)
中央高校基本科研业务费专项基金项目(DUT2017LK02)
关键词
中心穿透裂纹
张开应力
裂纹最大张口位移
拉伸过载
裂纹扩展
量化分析
centre crack
crack opening stress
maximum crack opening displacement
overload
crack propagation
qnantitative analysis
