stress relaxation，物质被施加一定的压力而变形，并使其保持一定应力时，应力随时间而减少，把这种现象称为应力缓和。
结果 三七粉应力缓和曲线与玉米淀粉最相似；
Results Stress-relaxation curve of PN powder was relatively similar to that of corn starch.
随着梯度结构层数的增加，应力缓和效果增强，但增强的趋势由明显变为平缓。
With the increase of the gradient layer number, the effect of thermal stress mitigation is more obvious, but the trend becomes smooth.
本文分析了异种材料固相连接接头热应力形成特点及其影响因素，指出材料的力学和热学性能与接头几何的匹配是异种材料固相连接热应力缓和设计的基础。
It is pointed that the matching of material properties and joint geometry is fundamental to the thermal stresses relaxation in the design of joints of dissimilar materials.
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