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一、前 言 近年来许多科技工作者对聚甲基丙烯酸甲酯(PMMA)板材的性能做了大量工作并有许多文献报导。但对疲劳断裂机理的研究尚属萌芽阶段,无成熟理论可以解释PMMA的疲劳断裂过程。但是,疲劳断裂机理的研究对于设计、生产和使用以及故障分析很有实际意义,同时对材料研究亦有益处。研究材料断裂机理的方法很多,但主要的是通过断口形貌分析,
I. INTRODUCTION In recent years, many scientists and technologists have done a lot of work on the properties of polymethylmethacrylate (PMMA) sheets and have reported many articles. However, the research on mechanism of fatigue fracture is still in its infancy. No mature theory can explain the fatigue fracture process of PMMA. However, the study of the mechanism of fatigue fracture is of great practical significance for design, production and use as well as failure analysis, and it is also beneficial for material research. There are many ways to study the fracture mechanism of materials, but the main one is through the fracture surface analysis,