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聚氯乙烯(PVC)塑料在化工生产设备上使用日益增多,但如何安全地应用这些材料,就必须研究它在应力和环境介质共同作用下的环境应力开裂(简称ESC)行为。研究环境应力开裂常常是通过该行为的银纹特征入手的。通过观察银纹的引发、成长、终止等阶段所提供的数据,来估算PVC在某介质中设备结构强度使用的寿命。早期人们是采用“恒应力试验法”来观察银纹的成长规律的。但此法对银纹观察不便,且获取的数据有一定的误差,为此英国
Polyvinyl chloride (PVC) plastics are used more and more in chemical production equipment. However, how to use these materials safely, it is necessary to study the environmental stress cracking (ESC) behavior under the combined effect of stress and environmental media. Stress cracking in the study environment is often initiated by the silver grain features of the behavior. By observing the silver grain initiation, growth, termination and other stages of the data provided to estimate the PVC equipment in a medium strength of the life of the structure used. Early people are using “constant stress test ” to observe the growth of the silver rule. However, this method is inconvenient for the observation of the silver pattern, and the obtained data have some errors, for which the United Kingdom