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。
Using Young modulus of apparatus, the hysteresis property of tension exerted by steel wire is analyzed, the experimental way and theoretical principle are provided to check the quality of springs.
利用杨氏模量测定仪对钢丝力的滞后特性进实验分析，为减少实验误差和检验弹簧的好坏提供了一种实验途径及理论依据。
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