Details
| Original language | English |
|---|---|
| Article number | 102614 |
| Journal | Theoretical and Applied Fracture Mechanics |
| Volume | 108 |
| Publication status | Published - Aug 2020 |
| Externally published | Yes |
Abstract
The present paper deals with the effects of repair welding residual stresses on the fracture behavior of IN939. A finite element (FE) model was developed using SYSWELD for the thermal-mechanical simulation of the welding process. The predicted residual stresses were verified through experiments. The results were then mapped to the fracture FE model in ABAQUS for further studies. A comparison of the fracture model predictions and experiments shows a reasonable agreement. The measured fracture toughness of partially welded compact tension (CT) specimens showed a considerable decrease in comparison with the as-received (AR) ones. The results revealed that welding residual stresses at the crack front were tangible non-uniform, and asymmetric. Both longitudinal and transverse residual stresses were maximum at the crack tip on free surfaces. In contrast, all three components of residual stresses were found to be compressive in the middle of the crack tip. The modified J-integral was affected by residual stresses and showed unexpected and irregular distribution along the crack front. Considerable changes were observed in both maximum J-integral value and its position. The residual stresses induced by the partial penetration repair welds reduce the fracture toughness, increase the crack driving force growth rate with the load, and change the critical point in which the crack driving force is maximum.
Keywords
- Crack driving force, Finite element analysis, Fracture toughness, IN939 Ni-based superalloy, Repair welding, Residual stresses
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanical Engineering
- Mathematics(all)
- Applied Mathematics
- Materials Science(all)
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In: Theoretical and Applied Fracture Mechanics, Vol. 108, 102614, 08.2020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Effects of residual stresses induced by repair welding on the fracture toughness of Ni-based IN939 alloy
AU - Moattari, M.
AU - Shokrieh, M.M.
AU - Moshayedi, H.
N1 - Publisher Copyright: © 2020 Elsevier Ltd
PY - 2020/8
Y1 - 2020/8
N2 - The present paper deals with the effects of repair welding residual stresses on the fracture behavior of IN939. A finite element (FE) model was developed using SYSWELD for the thermal-mechanical simulation of the welding process. The predicted residual stresses were verified through experiments. The results were then mapped to the fracture FE model in ABAQUS for further studies. A comparison of the fracture model predictions and experiments shows a reasonable agreement. The measured fracture toughness of partially welded compact tension (CT) specimens showed a considerable decrease in comparison with the as-received (AR) ones. The results revealed that welding residual stresses at the crack front were tangible non-uniform, and asymmetric. Both longitudinal and transverse residual stresses were maximum at the crack tip on free surfaces. In contrast, all three components of residual stresses were found to be compressive in the middle of the crack tip. The modified J-integral was affected by residual stresses and showed unexpected and irregular distribution along the crack front. Considerable changes were observed in both maximum J-integral value and its position. The residual stresses induced by the partial penetration repair welds reduce the fracture toughness, increase the crack driving force growth rate with the load, and change the critical point in which the crack driving force is maximum.
AB - The present paper deals with the effects of repair welding residual stresses on the fracture behavior of IN939. A finite element (FE) model was developed using SYSWELD for the thermal-mechanical simulation of the welding process. The predicted residual stresses were verified through experiments. The results were then mapped to the fracture FE model in ABAQUS for further studies. A comparison of the fracture model predictions and experiments shows a reasonable agreement. The measured fracture toughness of partially welded compact tension (CT) specimens showed a considerable decrease in comparison with the as-received (AR) ones. The results revealed that welding residual stresses at the crack front were tangible non-uniform, and asymmetric. Both longitudinal and transverse residual stresses were maximum at the crack tip on free surfaces. In contrast, all three components of residual stresses were found to be compressive in the middle of the crack tip. The modified J-integral was affected by residual stresses and showed unexpected and irregular distribution along the crack front. Considerable changes were observed in both maximum J-integral value and its position. The residual stresses induced by the partial penetration repair welds reduce the fracture toughness, increase the crack driving force growth rate with the load, and change the critical point in which the crack driving force is maximum.
KW - Crack driving force
KW - Finite element analysis
KW - Fracture toughness
KW - IN939 Ni-based superalloy
KW - Repair welding
KW - Residual stresses
UR - http://www.scopus.com/inward/record.url?scp=85083882256&partnerID=8YFLogxK
U2 - 10.1016/j.tafmec.2020.102614
DO - 10.1016/j.tafmec.2020.102614
M3 - Article
VL - 108
JO - Theoretical and Applied Fracture Mechanics
JF - Theoretical and Applied Fracture Mechanics
SN - 0167-8442
M1 - 102614
ER -