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Indexed by:会议论文

Date of Publication:2011-10-21

Included Journals:EI、CPCI-S、Scopus

Volume:361-363

Page Number:1387-1391

Key Words:short fatigue crack; collective evolution; surface damage variable; complex stress state; high temperature

Abstract: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.