Experimental Characterization and Computational Modelling for Fatigue Behavior of a Ni-Based Single Crystal Alloy Considering Surface Roughness

J. J. Wang; Z. X. Wen; Y. M. Zhang; Y. Q. Yang; H. Q. Pei; Z. F. Yue

doi:10.1007/s12540-020-00784-9

Experimental Characterization and Computational Modelling for Fatigue Behavior of a Ni-Based Single Crystal Alloy Considering Surface Roughness

J. J. Wang, Z. X. Wen, Y. M. Zhang, Y. Q. Yang, H. Q. Pei, Z. F. Yue

School of Mechanics,Civil Engineering and Architecture

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

Abstract

Abstract: Using a combination of tests and numerical simulations, the fatigue behaviors of a Ni-based single crystal (SC) alloy with different surface roughnesses (SRs) are studied. The test results demonstrate that the fatigue life decreases with increasing SR, while the strain accumulation shown an opposite trend. Surface defects can give rise to the nucleation, aggregation and growth of surface cracks, which are the principal inducement of fatigue failure. Finite element models of the actual surface topography were established, and the notched plate models whose modelling parameters were determined by the SR parameters (R_z, R_sm, R_a) were used to equivalently simplify, the equivalent errors are within 5%. In addition, a semi-empirical formula between the surface stress concentration factor (K_t) and the SR parameters was fitted. By introducing the K_t expressed by the SR parameters into a fatigue damage model based on crystal plasticity theory, a fatigue life prediction method of a Ni-based SC alloy that considers SR was established, and it has been verified to exhibit excellent consistency with the test results. Graphic Abstract: [Figure not available: see fulltext.]

Original language	English
Pages (from-to)	4383-4396
Number of pages	14
Journal	Metals and Materials International
Volume	27
Issue number	11
DOIs	https://doi.org/10.1007/s12540-020-00784-9
State	Published - Nov 2021

Keywords

Crystal plastic model
Fatigue behavior
Fracture analysis
Stress concentration factor
Surface roughness

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title = "Experimental Characterization and Computational Modelling for Fatigue Behavior of a Ni-Based Single Crystal Alloy Considering Surface Roughness",

abstract = "Abstract: Using a combination of tests and numerical simulations, the fatigue behaviors of a Ni-based single crystal (SC) alloy with different surface roughnesses (SRs) are studied. The test results demonstrate that the fatigue life decreases with increasing SR, while the strain accumulation shown an opposite trend. Surface defects can give rise to the nucleation, aggregation and growth of surface cracks, which are the principal inducement of fatigue failure. Finite element models of the actual surface topography were established, and the notched plate models whose modelling parameters were determined by the SR parameters (Rz, Rsm, Ra) were used to equivalently simplify, the equivalent errors are within 5%. In addition, a semi-empirical formula between the surface stress concentration factor (Kt) and the SR parameters was fitted. By introducing the Kt expressed by the SR parameters into a fatigue damage model based on crystal plasticity theory, a fatigue life prediction method of a Ni-based SC alloy that considers SR was established, and it has been verified to exhibit excellent consistency with the test results. Graphic Abstract: [Figure not available: see fulltext.]",

keywords = "Crystal plastic model, Fatigue behavior, Fracture analysis, Stress concentration factor, Surface roughness",

author = "Wang, {J. J.} and Wen, {Z. X.} and Zhang, {Y. M.} and Yang, {Y. Q.} and Pei, {H. Q.} and Yue, {Z. F.}",

note = "Publisher Copyright: {\textcopyright} 2020, The Korean Institute of Metals and Materials.",

year = "2021",

month = nov,

doi = "10.1007/s12540-020-00784-9",

language = "英语",

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T1 - Experimental Characterization and Computational Modelling for Fatigue Behavior of a Ni-Based Single Crystal Alloy Considering Surface Roughness

AU - Wang, J. J.

AU - Wen, Z. X.

AU - Zhang, Y. M.

AU - Yang, Y. Q.

AU - Pei, H. Q.

AU - Yue, Z. F.

PY - 2021/11

Y1 - 2021/11

N2 - Abstract: Using a combination of tests and numerical simulations, the fatigue behaviors of a Ni-based single crystal (SC) alloy with different surface roughnesses (SRs) are studied. The test results demonstrate that the fatigue life decreases with increasing SR, while the strain accumulation shown an opposite trend. Surface defects can give rise to the nucleation, aggregation and growth of surface cracks, which are the principal inducement of fatigue failure. Finite element models of the actual surface topography were established, and the notched plate models whose modelling parameters were determined by the SR parameters (Rz, Rsm, Ra) were used to equivalently simplify, the equivalent errors are within 5%. In addition, a semi-empirical formula between the surface stress concentration factor (Kt) and the SR parameters was fitted. By introducing the Kt expressed by the SR parameters into a fatigue damage model based on crystal plasticity theory, a fatigue life prediction method of a Ni-based SC alloy that considers SR was established, and it has been verified to exhibit excellent consistency with the test results. Graphic Abstract: [Figure not available: see fulltext.]

AB - Abstract: Using a combination of tests and numerical simulations, the fatigue behaviors of a Ni-based single crystal (SC) alloy with different surface roughnesses (SRs) are studied. The test results demonstrate that the fatigue life decreases with increasing SR, while the strain accumulation shown an opposite trend. Surface defects can give rise to the nucleation, aggregation and growth of surface cracks, which are the principal inducement of fatigue failure. Finite element models of the actual surface topography were established, and the notched plate models whose modelling parameters were determined by the SR parameters (Rz, Rsm, Ra) were used to equivalently simplify, the equivalent errors are within 5%. In addition, a semi-empirical formula between the surface stress concentration factor (Kt) and the SR parameters was fitted. By introducing the Kt expressed by the SR parameters into a fatigue damage model based on crystal plasticity theory, a fatigue life prediction method of a Ni-based SC alloy that considers SR was established, and it has been verified to exhibit excellent consistency with the test results. Graphic Abstract: [Figure not available: see fulltext.]

KW - Crystal plastic model

KW - Fatigue behavior

KW - Fracture analysis

KW - Stress concentration factor

KW - Surface roughness

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DO - 10.1007/s12540-020-00784-9

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SN - 1598-9623

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JO - Metals and Materials International

JF - Metals and Materials International

IS - 11

ER -

Experimental Characterization and Computational Modelling for Fatigue Behavior of a Ni-Based Single Crystal Alloy Considering Surface Roughness

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