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论文类型：会议论文

发表时间：2011-10-21

收录刊物：EI、CPCI-S、Scopus

卷号：361-363

页面范围：1387-1391

关键字：short fatigue crack; collective evolution; surface damage variable; complex stress state; high temperature

摘要：The collective evolution of short fatigue crack was experimentally studied through differently-notched cylindrical specimens under symmetrical triangle wave load. A simple and feasible method to measure the damage variable was introduced. The crack length and surface damage variable were obtained by the observation system, the measurement software and the Mat lab program. The results show that: Grain boundary is the key factor leading to plateau regions phenomena during the increasing process of crack length; the group behavior of short fatigue crack is measurable and can be described by surface damage variable (D); the fitting curves of D-N/N-f present remarkable stage characteristics.