压应力对裂尖塑性区影响的量化研究  

Quantitative study on the influence of compressive stress on crack tip plastic zone

作　　者：陈景杰[1] 黄一[1] 李玉刚[2] 

机构地区：[1]大连理工大学船舶工程学院,辽宁大连116024 [2]大连理工大学深海工程研究中心,辽宁大连116024

出　　处：《华中科技大学学报（自然科学版）》2016年第2期102-106,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金青年基金资助项目(51209135);国家自然科学基金创新研究群体科学基金资助项目(51221961);中央高校基本科研业务费专项资金资助项目(DUT14LK01)

摘　　要：为了量化压应力对裂尖反向塑性区尺寸的影响,填补压应力作用下裂尖塑性区尺寸估算的空白,基于理想弹塑性材料采用有限元数值计算方法,研究了含有中心穿透裂纹有限平板在拉压循环载荷作用下裂尖塑性区尺寸的变化规律,并分析了裂纹长度、应力比、时间历程等因素的影响;建立了压应力引起的裂尖最大反向塑性区尺寸的估算模型,提出了一种适用于R<0拉压循环载荷作用的基于裂纹最大张口位移确定最大反向塑性区尺寸的简便方法.To quantify the effect of compressive stress on the crack tip reverse plastic zone size （CTR‐PZS） ,and fill the research gap of estimating CTRPZS generated by compressive stress ,the finite ele‐ment method （FEM ） was employed to study the variation of CTRPZS for the central through cracked finite plate model subjected to tensile‐compressive cyclic load on the basis of elastic‐perfectly plastic material .The effects of crack length ,stress ratio and time history were further analyzed .The estima‐tion model for the maximum CTRPZS generated by compression stress was established .A simple method was proposed to calculate the maximum CTRPZS based on maximum crack opening displace‐ment （MCOD） .The method is suitable for the finite model subject to tension‐compression cyclic load at R〈0 .

关 键 词：裂尖塑性区 裂纹最大张口位移 理想弹塑性材料 中心穿透裂纹 压应力 拉压循环载荷 

分 类 号：U661.4[交通运输工程—船舶及航道工程]