Hardening law and fatigue damage of a cyclic hardening metal

✍ Scribed by Niu Xiaode; Li Guangxia; Lee Hao

• Publisher: Elsevier Science
• Year: 1987
• Tongue: English
• Weight: 548 KB
• Volume: 26
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(87)90194-9

✦ Synopsis

A method describing the hardening law of a cyclic hardening metal is proposed. The variation of stress-strain relation with cyclic ratio N/N, due to cyclic hardening of a metal under different load levels is described by a new parameter H. The critical value H, at fatigue failure depends upon the load level. Using a normalized cyclic hardening parameter, a fatigue damage model is then constructed. Two level tests show that the fatigue model is acceptable and not sensitive to the change of the method describing the cyclic hardening law. NOMENCLATURE fatigue damage variable cyclic hardening parameters normalized cyclic hardening parameters critical value of H or H' at fatigue failure cyclic strength coefficient number of cycles cyclic strain hardening exponent fatigue life cyclic ratio cyclic hardening rate parameters true stress range at the second cycle true stress range true plastic strain range at the second cycle true plastic strain range