SEDL / STP / STP601-EB / STP28637S

Relevance of Nonlinear Fracture Mechanics to Creep Cracking

Nikbin, KM
Research student, senior lecturer, and professor of materials in mechanical engineering, Imperial College, London,

Webster, GA
Research student, senior lecturer, and professor of materials in mechanical engineering, Imperial College, London,

Turner, CE
Research student, senior lecturer, and professor of materials in mechanical engineering, Imperial College, London,

Pages: 16    Published: Jan 1976

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Abstract

Creep crack growth tests, conducted on contoured double cantilever beam (DCB) specimens are described for aluminium alloy RR58 and a chromium-molybdenum-vanadium steel. The results are analyzed in terms of ˙J, the rate equivalent of the J contour integral, which is a nonlinear fracture mechanics parameter. Direct proportionality is found between crack growth rate, ˙a and ˙J. The treatment is shown to reveal a unification of the linear elastic fracture mechanics and net section or reference stress descriptions of creep cracking.