Details
| Original language | English |
|---|---|
| Article number | 103464 |
| Journal | Theoretical and Applied Fracture Mechanics |
| Volume | 121 |
| Early online date | 2 Jul 2022 |
| Publication status | Published - Oct 2022 |
| Externally published | Yes |
Abstract
The present paper aims to study the effect of crack-tip geometrical constraints and welding residual stresses (WRS), as well as their interaction on fracture behavior of IN939 superalloy, which is widely used in gas turbine hot section components, such as turbine vanes. For the thermal–mechanical simulation of welding processes, a finite element (FE) model was developed, and the predicted WRS was verified through experiments. Two welding paths and two mechanical boundary conditions were considered to develop four different WRS distributions within the same geometry. These results were mapped to the validated fracture finite element models. By varying the loading conditions, two sets of specimens with high and low geometrical constraints were achieved in the same geometry. Two-parameter fracture mechanics analyses were then used to examine the effects of four WRS profiles and geometrical constraints on the fracture behavior of each set. Generally, the impact of WRS is more evident in specimens with lower geometrical constraints. The fracture behavior might be unexpectedly affected if the WRS changes from tensile to compressive near the crack tip. Using the maximum stress triaxiality factor, it was shown that the fracture behavior as a function of WRS is better demonstrated than that of the Q-constraint parameter.
Keywords
- Crack-tip geometrical constraint, Finite element, Fracture behavior, Inconel 939, Maximum stress triaxiality factor, Q-constraint, Welding residual stress
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanical Engineering
- Mathematics(all)
- Applied Mathematics
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In: Theoretical and Applied Fracture Mechanics, Vol. 121, 103464, 10.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Interaction of crack-tip constraint and welding residual stresses on the fracture behavior of Ni-based alloy
AU - Moattari, M.
AU - Shokrieh, M. M.
AU - Moshayedi, H.
N1 - Funding Information: This research was supported by Iran National Science Foundation (INSF), grant No. 97005493. Publisher Copyright: © 2022 Elsevier Ltd
PY - 2022/10
Y1 - 2022/10
N2 - The present paper aims to study the effect of crack-tip geometrical constraints and welding residual stresses (WRS), as well as their interaction on fracture behavior of IN939 superalloy, which is widely used in gas turbine hot section components, such as turbine vanes. For the thermal–mechanical simulation of welding processes, a finite element (FE) model was developed, and the predicted WRS was verified through experiments. Two welding paths and two mechanical boundary conditions were considered to develop four different WRS distributions within the same geometry. These results were mapped to the validated fracture finite element models. By varying the loading conditions, two sets of specimens with high and low geometrical constraints were achieved in the same geometry. Two-parameter fracture mechanics analyses were then used to examine the effects of four WRS profiles and geometrical constraints on the fracture behavior of each set. Generally, the impact of WRS is more evident in specimens with lower geometrical constraints. The fracture behavior might be unexpectedly affected if the WRS changes from tensile to compressive near the crack tip. Using the maximum stress triaxiality factor, it was shown that the fracture behavior as a function of WRS is better demonstrated than that of the Q-constraint parameter.
AB - The present paper aims to study the effect of crack-tip geometrical constraints and welding residual stresses (WRS), as well as their interaction on fracture behavior of IN939 superalloy, which is widely used in gas turbine hot section components, such as turbine vanes. For the thermal–mechanical simulation of welding processes, a finite element (FE) model was developed, and the predicted WRS was verified through experiments. Two welding paths and two mechanical boundary conditions were considered to develop four different WRS distributions within the same geometry. These results were mapped to the validated fracture finite element models. By varying the loading conditions, two sets of specimens with high and low geometrical constraints were achieved in the same geometry. Two-parameter fracture mechanics analyses were then used to examine the effects of four WRS profiles and geometrical constraints on the fracture behavior of each set. Generally, the impact of WRS is more evident in specimens with lower geometrical constraints. The fracture behavior might be unexpectedly affected if the WRS changes from tensile to compressive near the crack tip. Using the maximum stress triaxiality factor, it was shown that the fracture behavior as a function of WRS is better demonstrated than that of the Q-constraint parameter.
KW - Crack-tip geometrical constraint
KW - Finite element
KW - Fracture behavior
KW - Inconel 939
KW - Maximum stress triaxiality factor
KW - Q-constraint
KW - Welding residual stress
UR - http://www.scopus.com/inward/record.url?scp=85133305017&partnerID=8YFLogxK
U2 - 10.1016/j.tafmec.2022.103464
DO - 10.1016/j.tafmec.2022.103464
M3 - Article
AN - SCOPUS:85133305017
VL - 121
JO - Theoretical and Applied Fracture Mechanics
JF - Theoretical and Applied Fracture Mechanics
SN - 0167-8442
M1 - 103464
ER -