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Title: Direct observations and characterization of crack closure during microstructurally small fatigue crack growth via in-situ high-energy X-ray characterization

Abstract

This study provides direct observation of the crack closure mechanism of a naturally occurring, tortuous, 3D microstructurally small fatigue crack (SFC) in additively manufactured Inconel 718. In-situ non-destructive characterization is performed using high-energy X-ray diffraction techniques to capture the evolution of the 3D microstructure and micromechanical response in the vicinity of the crack front. Based on the stress state of twelve grains analyzed at the crack tip, the crack closure events of the SFC front was found to be spatially heterogeneous with respect to loading progression governed by the local stress state of the grains (specifically the stress reversal from compression to tension). From this analysis, three grains that displayed different degrees of crack closure were further investigated, based on the orientation of the crack relative to the grains and the associated modality of crack growth. The stress normal to the crack plane and the associated degree of Mode I crack behavior were correlated with events of the crack opening earlier during the loading cycle. This was further corroborated by diffraction spot spreading analysis that quantified the crystallographic lattice distortion caused by the opening crack. Additionally, the detailed characterization of the opening behavior of the grains located at the crackmore » tip and their associated states of stress elucidates the mechanism governing crack closure and will inform future modeling efforts of this phenomenon.« less

Authors:
ORCiD logo [1];  [1];  [2]; ORCiD logo [2]; ORCiD logo [1]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. Argonne National Lab. (ANL), Lemont, IL (United States). Advanced Photon Source (APS)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOD Defense Advanced Research Projects Agency (DARPA); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1777368
Grant/Contract Number:  
AC02-06CH11357; N66001-14-1-4041
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 205; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; High energy X-ray diffraction microscopy (HEDM); Selective laser melting (SLM); Mixed mode crack growth; Micro computed tomography

Citation Formats

Ravi, Priya, Naragani, Diwakar, Kenesei, Peter, Park, Jun-Sang, and Sangid, Michael D. Direct observations and characterization of crack closure during microstructurally small fatigue crack growth via in-situ high-energy X-ray characterization. United States: N. p., 2021. Web. doi:10.1016/j.actamat.2020.116564.
Ravi, Priya, Naragani, Diwakar, Kenesei, Peter, Park, Jun-Sang, & Sangid, Michael D. Direct observations and characterization of crack closure during microstructurally small fatigue crack growth via in-situ high-energy X-ray characterization. United States. https://doi.org/10.1016/j.actamat.2020.116564
Ravi, Priya, Naragani, Diwakar, Kenesei, Peter, Park, Jun-Sang, and Sangid, Michael D. 2021. "Direct observations and characterization of crack closure during microstructurally small fatigue crack growth via in-situ high-energy X-ray characterization". United States. https://doi.org/10.1016/j.actamat.2020.116564.
@article{osti_1777368,
title = {Direct observations and characterization of crack closure during microstructurally small fatigue crack growth via in-situ high-energy X-ray characterization},
author = {Ravi, Priya and Naragani, Diwakar and Kenesei, Peter and Park, Jun-Sang and Sangid, Michael D.},
abstractNote = {This study provides direct observation of the crack closure mechanism of a naturally occurring, tortuous, 3D microstructurally small fatigue crack (SFC) in additively manufactured Inconel 718. In-situ non-destructive characterization is performed using high-energy X-ray diffraction techniques to capture the evolution of the 3D microstructure and micromechanical response in the vicinity of the crack front. Based on the stress state of twelve grains analyzed at the crack tip, the crack closure events of the SFC front was found to be spatially heterogeneous with respect to loading progression governed by the local stress state of the grains (specifically the stress reversal from compression to tension). From this analysis, three grains that displayed different degrees of crack closure were further investigated, based on the orientation of the crack relative to the grains and the associated modality of crack growth. The stress normal to the crack plane and the associated degree of Mode I crack behavior were correlated with events of the crack opening earlier during the loading cycle. This was further corroborated by diffraction spot spreading analysis that quantified the crystallographic lattice distortion caused by the opening crack. Additionally, the detailed characterization of the opening behavior of the grains located at the crack tip and their associated states of stress elucidates the mechanism governing crack closure and will inform future modeling efforts of this phenomenon.},
doi = {10.1016/j.actamat.2020.116564},
url = {https://www.osti.gov/biblio/1777368}, journal = {Acta Materialia},
issn = {1359-6454},
number = ,
volume = 205,
place = {United States},
year = {2021},
month = {12}
}

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