残余应力场对民机焊接壁板裂纹扩展速率影响的研究  

STUDY ON THE EFFECT OF RESIDUAL STRESS FIELD ON THE CRACK GROWTH RATE OF CIVIL WELDED PLATE

作　　者：陈杨柳[1] 宋欣[1] 白承正 盛宏威 张嘉振[1,2] CHEN YangLiu;SONG Xin;BAI ChengZheng;SHENG HongWei;ZHANG JiaZhen(College of Mechanical Power Engineering,Harbin University of Science and Technology,Harbin 150000,China;Instisute of Composite Materials and Structures,Harbin Instisute of Technology,Harbin 150000,China)

机构地区：[1]哈尔滨理工大学机械动力工程学院,哈尔滨150000 [2]哈尔滨工业大学复合材料与结构研究所,哈尔滨150000

出　　处：《机械强度》2018年第4期961-965,共5页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(51271067)资助~~

摘　　要：为了降低大型民机焊接壁板结构疲劳裂纹扩展试验成本,缩短焊接工艺在新型飞机壁板结构上应用的研究周期,利用Abaqus有限元软件,采用预定义温度场法模拟焊接残余应力场,通过有限元模拟得到裂尖应力强度因子值,结合大型焊接壁板结构特点,利用蒙皮材料参数,采用Pairs公式,预测焊接壁板的裂纹扩展速率,并基于该模型研究不同应力比与焊接工艺下试样的疲劳裂纹扩展速率。研究发现,残余应力使有效应力比Reff增加,但随着应力比的增加,影响逐渐降低;有效应力比的变化趋势与残余应力分布趋势相同。焊接残余应力提高了焊接构件的裂纹扩展速率。通过与试验结果进行对比,验证了文中所使用方法的可行性。In order to reduce the cost of fatigue crack growth test and shorten the research period of welding process on new aircraft siding structure,this paper uses Abaqus finite element software to simulate welding residual stress field by using predefined temperature field method.The stress intensity factor values of crack tip are obtained by finite element simulation.Based on the structural characteristics of large welded plate,the Pairs formula was used to predict the crack propagation rate of welded plate.Based on this model,the fatigue crack growth rate of specimens with different stress ratio and welding process was studied.It is found that the effective stress ratio increases with the residual stress,but the effect decreases with the increase of the stress ratio.The trend of the effective stress ratio is similar to that of the residual stress distribution.The welding residual stress increases the crack growth rate of the welded structure.The feasibility of the proposed method is verified by comparison with the experimental results.

关 键 词：裂纹扩展 焊接残余应力 有限元分析 

分 类 号：V215.6[航空宇航科学与技术—航空宇航推进理论与工程] V261.34