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Correlation of Cooperatively Localized Rearrangement on the “Fluidized Domain”of Polymers to Their Nonexponentially Viscoelastic Behavior and Lifetime at Double Aging Processes II: Estimation of Long-term Mechanical Behavior and Lifetime of Polymeric Mate
Yan Jin,Ming-shi Song*,Gui-xian Hu,Da-ming Wu
Author NameAffiliationE-mail
Yan Jin School of Mechanical and Electrical Engineering Beijing University of Chemical Technology, Beijing 100029, China  
Ming-shi Song* School of Materials Science and Engineering Beijing University of Chemical Technology, Beijing 100029, China songmingshi@mail.buct.edu.cn 
Gui-xian Hu School of Materials Science and Engineering Beijing University of Chemical Technology, Beijing 100029, China  
Da-ming Wu School of Mechanical and Electrical Engineering Beijing University of Chemical Technology, Beijing 100029, China  
Abstract:
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.
Key words:  Physical aging, Mechanical aging, Dimensional stability, Bearing ability, Creep and stress relaxation, Estimation of aging lifetime
FundProject:
Correlation of Cooperatively Localized Rearrangement on the “Fluidized Domain”of Polymers to Their Nonexponentially Viscoelastic Behavior and Lifetime at Double Aging Processes II: Estimation of Long-term Mechanical Behavior and Lifetime of Polymeric Mate
金艳,宋名实*,胡桂贤,吴大鸣
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.
关键词:  物理老化,力学老化,蠕变和应力松弛,尺寸稳定性,负荷可载性,储存老化寿命
DOI:10.1088/1674-0068/23/02/185-194
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