...关键字： 无铅焊点；微电阻；蠕变应变；电阻应变[gap=1559]Key words: lead-free solder joint; micro resistance; creep strain; electronic-resistance strain...
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稳定蠕变应变率本构方程是作用在盐岩上的应力偏量的幂次函数和能量与温度的指数函数。
The steady-state creep strain rate is a power function of deviatoric stress and exponential function of temperature and energy.
最大累积等效蠕变应变位于内层焊点，且在芯片边缘。
The maximum cumulative equivalent creep strain was located in inner solder ball and at the edge of silicon chip.
红砂岩在加速蠕变过程中具有高度的非线性，蠕变应变率随时间呈现跳跃增长特性。
The accelerative creep shows highly nonlinear characteristics; and the creep strain rate displays a discontinuous form, which occurs in jumps change.
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