结构对Sm2Ce2O7-YSZ热障涂层残余应力及热冲击性能的影响

采用ANSYS软件分析了涂层结构对Sm2Ce2O7-YSZ热障涂层热应力的影响。结果表明,在涂层表面存在较大的残余热应力和热冲击应力。径向残余热应力从试样中心至边沿逐渐降低,轴向和剪切残余应力在试样边沿明显增大。径向冲击应力与径向残余应力分布相似,但远大于径向残余应力。轴向冲击应力在试样边沿从压应力转变为拉应力,剪切冲击应力则急剧降低。涂层层数的增加有利于降低涂层的残余应力和冲击应力。

基体条件对等离子喷涂Sm_2Zr_2O_7热障涂层热冲击性能的影响

采用有限元分析软件ANSYS对等离子喷涂Sm2Zr2O7热障涂层在金属基体材质类型、厚度、半径变化时涂层的冲击热应力进行了分析。结果表明,涂层表面及表面层/金属粘结层界面处热应力及其应力梯度随着金属基体热膨胀系数增加而增大。当基体厚度超过20mm后,其对冲击热应力的影响基本可以忽略。当基体半径达到28mm后,涂层最大径向冲击热应力趋于稳定,最大轴向热应力随基体半径增加逐渐减小,最大剪切应力不受基体半径的影响。

一种金属材料抗热冲击性能的快速对比试验法

基于加速寿命试验原理,提出了一种简捷、实用的金属材料抗热冲击性能的快速对比试验方法。

PCB环境测试

本文介绍了印刷线路板常用的环境测试,重点论述了电化学迁移和导电阳极丝两个重要测试及注意事项。

Shock resistance of supercharged boilers through integration with ship structure

The non-linear finite element software ABAQUS was used to simulate the dynamic response of a marine supercharged boiler when subjected to impact loading. Shock resistance was analyzed by the time-domain simulation method. After exhaustive simulations,the effect of air pressure induced by different working conditions on the shock response of a supercharged boiler was reviewed,leading to conclusions about the variability of structural response with different loading parameters. In order to simulate the real impulsive environments of supercharged boilers,the integration of equipment and ship structure was then primarily used to analyze shock response. These distinctly different equipment shock test methods,run under equivalent work conditions,were compared and the causes of discrepancy were analyzed. The main purpose of this paper is to present references for the anti-shock design of marine supercharged boilers.