FORMULATION OF RESIDUAL STRESS INTENSITY FACTOR IN DCB SPECIMEN OF Al ALLOY
QIAN Yourong; CHEN Zailiang (Beijing Institute of Aeronautics and Astronautics)
Cite this article:
QIAN Yourong; CHEN Zailiang (Beijing Institute of Aeronautics and Astronautics). FORMULATION OF RESIDUAL STRESS INTENSITY FACTOR IN DCB SPECIMEN OF Al ALLOY. Acta Metall Sin, 1983, 19(5): 86-91.
Abstract The verified formulation for determining the residual stress intensity factor (SIF) in the DCB specimen was deduced as below:K_(IR)=Eφh h~(1/2)/2 3~(1/2)which can be easily got by measuring the curvature φ of the half-specimen and does not vary with the crack propagation. It was found that the value K_(IR) for LC4 Al alloy is markedly influenced by the aging temperature, e.g., below 120℃, its K_(IR)>K_(ISCC), the residual SIF can not be effectively dissipated, and its K_(IR) may be much lowered only by an additional fractional aging up to 160℃. The influence of the heat treatment upon the value K_(IR) of LC4 Al alloy has been described.
