Abstract
The basic assumption in the derivation of the high temperature fracture mechanics parameters is the homogeneity of materials. The material inhomogeneity introduced by welding is inevitable. How to characterize the creep crack growth with appropriate fracture mechanics parameters is rather challenging to the structural integrity assessment in the presence of weld interface. The influence of material mismatch on the stress field and the time-dependent fracture mechanics parameters of uniaxial welded specimens was studied. The applicability of conventional C equation based on the load line displacement was examined. It is found that under the extensive creep condition C value of hard weld/soft parent metal specimen can be significantly higher than that of single weld metal specimen, and the material mismatch has little influence on C(t) in small scale creep. It is proposed that the C formula based on the load line displacement recommended by ASTM E1457 needs to be modified to interpret the creep crack growth behavior of welded specimens.
| Original language | English |
|---|---|
| Pages (from-to) | 1-5 |
| Number of pages | 5 |
| Journal | Hanjie Xuebao/Transactions of the China Welding Institution |
| Volume | 21 |
| Issue number | 2 |
| State | Published - Jun 2000 |
Keywords
- Creep crack growth
- Material mismatch
- Testing standard
- Time-dependent fracture
- Weld