工艺性能试验 processibility test 规定残余伸长应力 permanent set stress 规定非比例伸长（压缩）应力 proof stress of non-proportional elongation（compression） ..
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The orientations of polyurethanes resulted in a large number of the residual orientation , the stress softing and stress hysteresis , the permanent set , the higher modulus and strength of materials .
取向的结果，导致大量的硬段残留取向、应力软化、应力滞后和高变形，以及材料的高模量和高强度。
Metal flow takes place within the plastic range of the metal, so that the bend retains a permanent set after removal of the applied stress.
金属的流动发生在金属的塑性变形范围之内，因此在施加的外力去除之后弯曲保持永久的变形。
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