塑料业已超出家庭日用品中的杂货及电气元件的领域,发展到广泛采用于辅助结构材料及主结构材料方面。但它和金属相比,历史较短,还不能说表示机械性能的数据(资料)很充足,特别是疲劳和蠕变这些长时实验的数据是稀少的。既然用于结构材 Plastics have surpassed the grocery and electrical components in household goods and are widely used in auxiliary structural materials and main structural materials. However, compared with metals, it has a short history and it can not be said that the data (data) showing the mechanical properties are sufficient. In particular, the data of long-term experiments such as fatigue and creep are scarce. Since used for structural material