| About this Abstract |
| Meeting |
2024 AWS Professional Program
|
| Symposium
|
2024 AWS Professional Program
|
| Presentation Title |
Influence of Welding Residual Stresses on the Fracture Toughness in Compact Test Coupon by High-fidelity Numerical Modeling |
| Author(s) |
Hui Huang, Yanli Wang, Jian Chen, Zhili Feng, Yongbing Li |
| On-Site Speaker (Planned) |
Hui Huang |
| Abstract Scope |
The non-uniform heating and cooling in welding process usually causes complex microstructure evolution as well as residual stresses in the weld zone and heat affected zone of metallic components. The fracture toughness of the weld metal is of vital importance to the durability and safety of welded structures. On the other hand, the welding residual stresses especially the high tensile stresses have negative impacts on the fatigue properties and fracture behaviors of welded structures. However, it is generally believed that residual stresses in small coupons for mechanical test are negligible after electric discharge machining or mechanical cutting. In recent years, experimental studies on fatigue crack test of high strength steel have revealed that, a compact tensile specimen can retain high residual stresses which prevent the crack to propagate during test. Due to the limitation of measuring technique and the complexity of the stress distribution, numerical modeling with experimental validation are indispensable characterization tools toward enhanced structural integrity. In this study, a virtual fabrication of test coupons from the welding process to specimen preparation is carried out by numerical simulation. A multi-pass stainless steel pipe girth welding was first modeled by three-dimensional thermo-mechanical finite element analysis. The computational performance was enhanced by a novel accelerated explicit method and GPU technology. The residual stresses were validated by physical measurement on the outer surface as well as the inner surface for both axial stresses and hoop stresses. Subsequently, the test coupon for fracture toughness was virtually cut out from the welded component and loaded to evaluate stress intensity factor. The influence of cutting location, orientation, and size of specimen on fracture performance was investigated systematically to provide a fundamental understanding of welding residual stress and necessary insights into the specimen preparation procedure. |
| Proceedings Inclusion? |
Undecided |