单晶合金中裂纹演化的有限元分析  

Finite Element Analysis of Crack Evolution in Single Crystal Alloy

作　　者：张姝[1] 刘志超 杨杰 ZHANG Shu;LIU Zhichao;YANG Jie(School of Mechanical and Power Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China)

机构地区：[1]沈阳化工大学机械与动力工程学院,沈阳110142

出　　处：《机械工程师》2023年第2期31-33,共3页Mechanical Engineer

基　　金：国家自然科学基金项目(50571070)。

摘　　要：对DD6合金在有裂纹和无裂纹缺陷的条件下,对其进行蠕变性能的测试、组织形貌的观察并采用ABAQUS软件对在裂纹附近的应力分布进行有限元分析。研究了单晶合金的蠕变行为和组织形貌受存在缺陷的影响。结果表明:试样的蠕变寿命由于受到组织缺陷的影响明显降低。近裂纹区域的应力较大值出现在与施加应力轴成45°角的方向,并且应力呈现出蝶形分布的特征。合金裂纹缺陷附近的应力较小值在其上下区域,最大值在两侧极点处,在极点处试样沿壁厚方向两端的应力比中部大,当裂纹沿[010]方向时应力稍大于沿[110]方向。随着蠕变的继续,应力值进一步增大,使裂纹长大,其扩展方向垂直于应力轴,导致合金蠕变寿命降低。The creep properties of DD6 alloy with and without crack defects are tested,the microstructure and morphology are observed,and the stress distribution near the crack is analyzed by finite element analysis using ABAQUS software.The creep behavior and microstructure of single crystal alloys are studied under the influence of the existence of defects.The results show that the creep life of the specimens is significantly reduced due to the influence of microstructure defects.The larger value of the stress in the near-crack region appears in the direction of 45°with the applied stress axis,and the stress exhibits the characteristics of butterfly distribution.The smaller value of the stress near the alloy crack defect is in its upper and lower regions,and the maximum value is at the poles on both sides.At the poles,the stress at both ends of the sample along the wall thickness direction is larger than that in the middle.When the crack is along the direction[010],the stress is slightly greater than that along the direction[110].As the creep continues,the stress value further increases,making the crack grow,and its propagation direction is perpendicular to the stress axis,resulting in a decrease in the creep life of the alloy.

关 键 词：单晶镍基合金 裂纹 蠕变寿命 有限元分析 

分 类 号：V115.57[航空宇航科学与技术—人机与环境工程]