Fatigue crack propagation beyond general yield
Tests are carried out on compact tension specimens of AISI 1020 hot-rolled steel at nominal stress levels beyond yield. The results show that crack propagation rates can be correlated successfully using an operational definition of the range ..delta..J of the J-integral. The rate of crack growth per cycle da/dN is shown to be related to ..delta..J by da/dN=A (..delta..J) /SUP a/ for conditions ranging from linear elastic to limit load. The exponent a agrees well with other published data on low strength steels and the quantity A is found to have a weak dependence on frequency. Examination of the fracture surface reveals that static failure modes are operating at the high crack propagation rates.
- Research Organization:
- Department of Mechanical Engineering, Bogazici University, Istanbul
- OSTI ID:
- 6133687
- Journal Information:
- J. Eng. Mater. Technol.; (United States), Journal Name: J. Eng. Mater. Technol.; (United States) Vol. 104:3; ISSN JEMTA
- Country of Publication:
- United States
- Language:
- English
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