中文摘要：

以四种不同类型高聚物（半晶聚丙烯、聚甲基烯酸甲酯、交联环氧树酯和炭黑填充丁苯橡胶）的短时标应力松弛和蠕变测试实验数据作为实例，按照两套应力松弛模量和蠕变柔量普适对比态方程，从理论组合主直线上直线外推了四种高聚物的长时标力学行为和寿命，并将其外推预测值同理论计算值和实测值进行了对比. 结果证实四种高聚物的外推预测值均同理论计算值和实测值很好地符合. 又讨论了它们的尺寸稳定性、负荷承载性，失效寿命和失效形变量等对老化时间的依赖性. 最终证实该从理论组合主直线上来直线外推长时标力学行为和寿命的方法是有效可行的.

英文摘要：

Three kinds of polymeric materials are taken as example for the verification of linear ex-trapolation method from unified master lines with reduced universal equations on creep and stress relaxation tests. The theoretical values of long-term mechanical behavior and lifetime for a cured epoxide, polypropylene, poly（methyl-methacrylate）, and SBR rubber are directly evaluated with the universal equations on reduced creep compliance and reduced stress relax-ation modulus and are compared with their predicted values by the linear extrapolation from the unified master lines of creep and stress relaxation. The results show that the theoretical values of dimensional stability, bearing ability and lifetime are in an excellent agreement with the predicted values, it shows that the linear extrapolation method is more simple and reliable. The dependences of long-term mechanical behaviors and lifetime on the different aging times are discussed.