Residual Stress Analysis of Cold-Sprayed Copper Coatings by Numerical Simulation
Residual Stress Analysis of Cold-Sprayed Copper Coatings by Numerical Simulation
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DOI：
10.1007/s11666-015-0308-1
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发表时间：
2015
影响因子：
3.1
通讯作者：
Wenya Li;Kang Yang;Dongdong Zhang;Xianglin Zhou
中科院分区：
文献类型：
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作者：
Wenya Li;Kang Yang;Dongdong Zhang;Xianglin Zhou
本文对Cu和Al基体上冷喷涂铜涂层的残余应力演化进行了分析。为了研究颗粒速度、温度和材料组合对最终残余应力的影响，基于所建立的热-力耦合欧拉模型的仿真结果，提出了一种综合计算框架。在单个铜片中，一般来说，最大残余应力和塑性变形集中在接触区外，而不是在初始冲击中心点。在冲击过程中，颗粒与基体之间的摩擦剪切作用是影响最终残余应力的重要因素之一。残余应力的状态会随着材料组合、颗粒速度和温度的变化而发生显著变化。在单道次Cu涂层中，残余应力在涂层上波动，涂层内部同时存在压应力和拉应力。在一定的冲击速度范围内，合成残余应力随颗粒速度的增大而增大。本文的模拟结果与其他报道的实验结果相关联，表明残余应力状态和应力变化趋势与一些报道的结果有所不同。
In this paper, an analysis on the residual stress evolution of cold-sprayed copper coatings on Cu and Al substrates was performed. To investigate the influences of particle velocity, temperature and material combination on the final residual stresses, an integrated frame of calculation was proposed based on the simulation results obtained from the developed thermo-mechanically coupled Eulerian model. In a single Cu splat, generally speaking, the maximum residual stress and plastic deformation are concentrated at the outside contact zone rather than at the center point of initial impact. The action of friction shear between the particle and substrate during impacting should be considered as one of the essential factors on the final residual stress. And the states of residual stresses can vary significantly depending on the material combination, particle velocity, and temperature. In a single pass Cu coating, the residual stress fluctuates across the coating and there exists both compressive stress and tensile stress within the coating. At a certain range of impacting velocities, the resultant residual stresses increase with the increase of particle velocity. The present simulated results are related to the reported experiments by others, showing that the residual stress states and stress change trend are different from some of the reported results.