热量变化下含边裂纹TiC-Ni功能梯度条热应力影响  

Study on Thermal Stress Effect of TiC-Ni Functional Gradient Strips With Edge Cracks Under Heat Changes

作　　者：邹广平[1] Dergachova Nadiia 王宇洋 徐舒博 唱忠良[1] ZOU Guangping;Dergachova NADIIA;WANG Yuyang;XU Shubo;CHANG Zhongliang(College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China)

机构地区：[1]哈尔滨工程大学航天与建筑工程学院,黑龙江哈尔滨150001

出　　处：《沈阳大学学报（自然科学版）》2020年第3期183-187,199,共6页Journal of Shenyang University：Natural Science

基　　金：国家自然科学基金资助项目(11602068).

摘　　要：研究了不同升温条件(热冲击、指数升温和线性升温)对TiC-Ni功能梯度条热应力的影响.将含有垂直于边界的功能梯度条I型热应力断裂问题看作准静态弹性问题进行求解,并对其热应力和应力强度因子进行探讨.结果表明:不同升温机制对功能梯度条的热应力强度因子有显著影响;在线性升温速率下将获得最小热压应力,同时在指数升温和热冲击的条件下,热应力会随着时间的增加而降低;降低升温速率可以延迟功能梯度条边裂纹的扩展.The effects of different heating conditions,thermal shock,exponential heating and linear heating,on the thermal stress of TiC/Ni functional gradient strips were studied.The I-type thermal stress fracture problem of functional gradient strips perpendicular to the boundary was regarded as a quasistatic elastic problem for solution,and its thermal stress and stress intensity factor were discussed.The results show that different temperature rise mechanisms have a significant effect on the thermal stress intensity factor of the functional gradient stripe;under the linear heating rate,the minimum hot compression stress will be obtained,and under the conditions of exponential heating and thermal shock,the thermal stress will decrease with the increase of time;reducing the temperature rise rate can delay the growth of the functional gradient strip edge cracks.

关 键 词：功能梯度材料 边缘裂纹 热应力 准静态 热速率 

分 类 号：TB34[一般工业技术—材料科学与工程]