本文提出了一种计算DCB试样残余应力强度因子K_(IR)的公式,并取得了部分实验验证。利用剖切后半试样弯曲曲率的试验结果,确定了热处理制度对LC4合金K_(IR)值的影响。
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.
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