温度对裂纹尖端张开位移的影响  

Effect of temperature on opening displacement of crack tip

作　　者：李有堂[1] 栾秋慧 

机构地区：[1]兰州理工大学机电工程学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2016年第6期160-163,共4页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(71461018)

摘　　要：以含穿透缺口无限大受拉平板的Dugdale-Barrenblett模型(D-B模型)为基础,通过理论分析和数值模拟,讨论温度对裂纹尖端张开位移(CTOD)的影响规律.结果表明:裂纹尖端张开位移值在-90℃到20℃范围内随温度升高或降低而增大或减小;温度从20℃逐渐降低到-90℃,CTOD不发生变化;温度从-90℃升高,CTOD逐渐增大;随着荷载的增大,裂纹尖端张开位移随温度升高的幅度增大;荷载增大致使裂纹尖端塑性区发展程度变高,使得裂纹尖端张开位移随温度变化的幅度增大.Based on Dugdale-Barrenblett model （D-B model） of unlimited tensile plate with penetrating notch, the influence of temperature on crack tip opening displacement （CTOD） is explored through theo- retical analysis and numerical simulation. The result shows that crack tip opening displacement will in- crease（decrease）, as temperature increases（decreases） in temperature range from --90 ℃ to 20℃, the value of CTOD will not change if temperature decreases gradually from 20 ℃ to --90 ℃, and the value of CTOD will gradually if increase temperature increases from --90 ℃. When the load is increased the in- creasing magnitude of the crack tip opening displacement will increase with temperature. The increased load will lead to a greater propagation of crack tip plastic zone, so that the increasing magnitude of crack tip opening displacement will increase with temperature.

关 键 词：裂纹张开位移 低温 D-B模型 有限元分析 

分 类 号：O346[理学—固体力学]