复合材料厚壁圆筒的疲劳损伤研究  

Fatigue failure analysis of composite material tube

作　　者：杨宇宙[1] 钱林方[1] 徐亚栋[1] 陈龙淼[1] 

机构地区：[1]南京理工大学机械工程学院,南京210094

出　　处：《应用力学学报》2013年第3期378-383,476,共6页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(51205206)

摘　　要：基于能量耗散法,推导出了复合材料厚壁圆筒的疲劳损伤和疲劳寿命函数;在此基础上,采用有限元软件ABAQUS建立复合材料圆筒模型,进行了模拟周期内压载荷作用下的疲劳仿真计算,得到了随着循环数的增加,疲劳损伤变量不断增大和材料性能不断退化的损伤规律。以同样的方法和载荷边界条件计算了全金属圆筒疲劳损伤的起始和演化。对比结果表明:相同循环次数作用下,后者的裂纹扩展长度和张开位移更大;随着循环次数的增加,后者的疲劳破坏比前者更剧烈,更难预测。Based on the energy dissipated theory,fatigue damage and life expressions are proposed to predict the progressive failure properties of the steel-carbon fiber/epoxy composite tube.A 3D finite element technique is adopted to perform the progressive failure analysis.The material model has been implemented into ABAQUS standard finite element code and the law of its damage evolution has been concluded.During fatigue loading,the fatigue damage parameter grows stably and the material properties gradually deteriorate with increasing of the cycles.Fatigue damage initiation and growth of the all steel tube are also investigated with the same way.In contrast,with the same cycles,the crack length and crack opening displacement of the all steel tube are larger than the composite tube;with the cycles increasing,the fatigue damage of the all steel tube is more intense and more difficult to predict than the composite tube.

关 键 词：复合圆筒 疲劳损伤 疲劳寿命 直接循环法 能量耗散 

分 类 号：TB332[一般工业技术—材料科学与工程]