| Title |
Evaluation of Creep Crack Life time by Parameter of creep Local Strain Distribution |
| Abstract |
The purpose of this paper is to evaluate the parameter A(t) which can characterize the local creep strain distribution in 2024-T6Al alloy. The evaluation of creep crack initiation and dependence of temperatures were investigated by A(t). The results showed that the instantaneous strain distribution ε_(y,i) near the crack tip could be characterized by the parameter A(t). The parameter A(t) was applied to evaluate the creep crack initiation from pre-crack. It was found that creep cracks initiated when A(t) was reached at some critical values. These critical values were independent of loading levels but changed in propotion to 1/T (T : testing temperature). It is possible to estimate the crack growth initiation time using the instantaneous strain distribution parameter A(0). |