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A Universal Reduced Rupture Creep Approach for Prediction of Long Term Failure Behavior of Aged Glass Polymers from the Short Term Test of Rupture Creep Compliance by the Unified Master Curved Extrapolation
Guang-jun Song,Da-ming Wu,Wei-yue Song,Ming-shi Song*,Gui-xian Hu
Author NameAffiliationE-mail
Guang-jun Song School of Mechanical and Electrical 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  
Wei-yue Song Department of Polymeric Material Science and Engineering, Beijing Institute of Petrochemical Tech-nology, Beijing 102617, 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  
Abstract:
The prediction of long term failure behaviors and lifetime of aged glass polymers from the short term tests of reduced rupture creep compliance (or strain) is one of difficult problems in polymer science and engineering. A new “universal reduced rupture creep approach” with exact theoretical analysis and computations is proposed in this work. Failure by creep for polymeric material is an important problem to be addressed in the engineering. A universal equation on reduced extensional failure creep compliance for PMMA has been derived. It is successful in relating the reduced extensional failure creep compliance with aging time, temperature, levels of stress, the average growth dimensional number and the parameter in K-W-W function. Based on the universal equation, a method for the prediction of failure behavior, failure strain criterion, failure time of PMMA has been developed which is named as a universal “reduced rupture creep approach”. The results show that the predicted failure strain and failure time of PMMA at di?erent aging times for different levels of stress are all in agreement with those obtained directly from experiments, and the proposed method is reliable and practical. The dependences of reduced extensional failure creep compliance on the conditions of aging time, failure creep stress, the structure of fluidized-domain constituent chains are discussed. The shifting factor, exponent for time-stress superposition at different levels of stress and the shifting factor, exponent for time-time aging superposition at different aging time are theoretically defined respectively.
Key words:  Reduced extensional failure creep compliance, Extensional failure, Prediction of failure strain and time, PMMA, Shifting factor, Shifting exponent
FundProject:
一种从短期蠕变断裂柔量测试和主组合曲线外推来预测老化玻璃态聚合物长期失效行为的普适对比态断裂蠕变法
宋广军,吴大鸣,宋玮岳,宋名实*,胡桂贤
摘要:
通过准确理论分析和计算提出了一种从短期蠕变断裂柔量测试和主组合曲线外推来预测老化玻璃态聚合物长期失效行为的普适对比态断裂蠕变法. 首先,从理论上推导出PMMA的对比态拉伸失效蠕变普适方程. 它成功地把对比态拉伸失效蠕变柔量同老化时间、温度、应力水平、平均生长维数及参数以K-W-W形式方程联系起来. 基于该普适方程,创建了一种有效预测PMMA失效行为、失效应变判据和失效时间等的新方法|又称为普适对比态断裂蠕变法. 实验结果证实预测到的不同老化时间不同应力水平下的失效应变量、失效时间均同实验符合. 说明所提出的方法是实用可行的. 此外,还讨论了普适对比态拉伸失效柔量对老化时的老化条件、失效应力和流动微区链组结构间的依赖性. 最后,从理论上分别定义了在不同应力水平下移动因子、移动指数和时间-应力叠加原理方程,以及不同老化时间下移动因子、移动指数和时间-老化时间叠加原理方程.
关键词:  对比态拉伸失效蠕变柔量,拉伸失效,失效应变和失效时间的预测,PMMA ,移动因子,移动指数
DOI:10.1088/1674-0068/25/05/552-562
分类号: