Numerical investigation on the creep damage induced by void growth in heat affected zone of weldments |
| |
Authors: | Tao Yu Masataka Yatomi Hui-Ji Shi |
| |
Affiliation: | 1. FML, Department of Engineering Mechanics, Tsinghua University, Beijing, PR China;2. Research Laboratory, IHI Corporation, Tokyo, Japan |
| |
Abstract: | In structural welded joints after long-term service at high temperature, fracture occurs mainly in the fine-grained heat affected zone (HAZ). Recently, the nucleation and growth of creep voids in the fine-grained HAZ of weldments, recognized as Type IV fracture, have become an important problem for low alloy ferritic heat resisting steels. In this paper, a new constitutive model was introduced to analyze the creep damage development in HAZ induced by void growth. This model is based on the equations of continuum damage mechanics (CDM) and combines a micromechanism-based method to account for the void growth process, which is different from the previous studies of creep damage. By coding a user-defined material subroutine (UMAT) in the FEA software ABAQUS, the proposed model was used to investigate the creep damage development in HAZ of a multi-material cross-weld specimen and a medium bore welded branched pipe where four different material properties: base material, coarse-grained HAZ, fine-grained HAZ, and weld material, were taken into account. |
| |
Keywords: | Creep damage Finite element analysis Heat affected zone Void growth User-defined material subroutine |
本文献已被 ScienceDirect 等数据库收录! |
|