| 摘要 |
PROBLEM TO BE SOLVED: To utilize a polymeric material so that a void or a crack may not occur. SOLUTION: A method for evaluating a material strength includes the steps of restricting a stress effective region Sa of a test sheet S so as not to radially and circumferentially displace, applying a tensile stress of substantially uniform three-dimensional direction in the stress effective region S2 of the test sheet S, and obtaining a damage stress of the polymeric material in a state that the three-dimensional tensile stress is applied based on a relative displacing amount of the first fixed member 13 when a void or a crack occurs in the teste sheet S. COPYRIGHT: (C)2004,JPO
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