结果表明：七种材料的焊件都存在着尺寸不稳定，这种尺寸不稳定变形随时间的变化速率逐渐变缓；
The results show that the weldments made from those metals in as-welded condition are instable in dimension and the rate of dimensional change decreases with time.
应用有限变形弹性理论分析了受内压作用的不可压热超弹性球壳发生非对称变形的不稳定性问题。
Instability of asymmetric deformations of an incompressible thermo-hyperelastic spherical shell, subjected to internal pressure, is examined within the framework of finite elasticity.
当内外股分离给缆线材料所造成的压力操作了弹性极限后， 易位或者不稳定的情况就会产生，进而造成永久的变形。
When this separation strains the cable material beyond its elastic limit, instability or birdcaging occurs in the form of the permanent deformation.
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