Designing brittle fracture specimens to investigate environmentally assisted crack growth

Sunday Aduloju; Wenjia Gu; Timothy Truster; John Emery; Dave Reedy; Scott J. Grutzik

doi:10.1007/978-3-319-62831-8_5

Designing brittle fracture specimens to investigate environmentally assisted crack growth

Sunday Aduloju, Wenjia Gu, Timothy Truster, John Emery, Dave Reedy, Scott J. Grutzik

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Subcritical crack growth can occur in a glass when the stress intensity factor is less than the fracture toughness if water molecules are present. A novel bi-material beam specimen is proposed to investigate environmentally assisted crack growth (EACG). Two materials with different coefficients of thermal expansion are diffusion bonded at high temperature and cooled to the room temperature which introduces residual stress in the beam. A Finite element (FE) model is developed and initially validated with an analytical model. Steady-state crack (SSC) depth at which mode II stress intensity factor (K_II) is zero and the corresponding mode I stress intensity factor (K_I) value are obtained for different material pairs and thickness ratios of the top and bottom materials using the FE model. Crack propagation path is also predicted. We finally modify the geometry of the specimen to generate non-constant K_I values as the crack propagates.

Original language	English
Title of host publication	Fracture, Fatigue, Failure and Damage Evolution - Proceedings of the 2017 Annual Conference on Experimental and Applied Mechanics
Editors	Ryan B. Berke, Garrett J. Pataky, Alison M. Beese, Jay Carroll, Shuman Xia
Publisher	Springer New York LLC
Pages	25-33
Number of pages	9
ISBN (Print)	9783319628301
DOIs	https://doi.org/10.1007/978-3-319-62831-8_5
State	Published - 2018
Externally published	Yes
Event	Annual Conference and Exposition on Experimental and Applied Mechanics, 2017 - Indianapolis, United States Duration: Jun 12 2017 → Jun 15 2017

Publication series

Name	Conference Proceedings of the Society for Experimental Mechanics Series
Volume	7
ISSN (Print)	2191-5644
ISSN (Electronic)	2191-5652

Conference

Conference	Annual Conference and Exposition on Experimental and Applied Mechanics, 2017
Country/Territory	United States
City	Indianapolis
Period	06/12/17 → 06/15/17

Funding

Acknowledgements Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia LLC, a wholly owned subsidiary of Honeywell International Inc. for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525. This project was completed as part of the Nonlinear Mechanics and Dynamics (NOMAD) Institute, co-hosted by Sandia National Laboratories and the University of New Mexico. The authors would like to thank Fracture Analysis Consultants (Ithaca, NY) for complimentary use of the Franc3D software.

Funders	Funder number
U.S. Department of Energy
National Nuclear Security Administration	DE-NA0003525

Keywords

Crack growth
Self-loading
Steady-state
Stress intensity factor

Access to Document

10.1007/978-3-319-62831-8_5

Cite this

Aduloju, S., Gu, W., Truster, T., Emery, J., Reedy, D., & Grutzik, S. J. (2018). Designing brittle fracture specimens to investigate environmentally assisted crack growth. In R. B. Berke, G. J. Pataky, A. M. Beese, J. Carroll, & S. Xia (Eds.), Fracture, Fatigue, Failure and Damage Evolution - Proceedings of the 2017 Annual Conference on Experimental and Applied Mechanics (pp. 25-33). (Conference Proceedings of the Society for Experimental Mechanics Series; Vol. 7). Springer New York LLC. https://doi.org/10.1007/978-3-319-62831-8_5

Aduloju, Sunday ; Gu, Wenjia ; Truster, Timothy et al. / Designing brittle fracture specimens to investigate environmentally assisted crack growth. Fracture, Fatigue, Failure and Damage Evolution - Proceedings of the 2017 Annual Conference on Experimental and Applied Mechanics. editor / Ryan B. Berke ; Garrett J. Pataky ; Alison M. Beese ; Jay Carroll ; Shuman Xia. Springer New York LLC, 2018. pp. 25-33 (Conference Proceedings of the Society for Experimental Mechanics Series).

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title = "Designing brittle fracture specimens to investigate environmentally assisted crack growth",

abstract = "Subcritical crack growth can occur in a glass when the stress intensity factor is less than the fracture toughness if water molecules are present. A novel bi-material beam specimen is proposed to investigate environmentally assisted crack growth (EACG). Two materials with different coefficients of thermal expansion are diffusion bonded at high temperature and cooled to the room temperature which introduces residual stress in the beam. A Finite element (FE) model is developed and initially validated with an analytical model. Steady-state crack (SSC) depth at which mode II stress intensity factor (KII) is zero and the corresponding mode I stress intensity factor (KI) value are obtained for different material pairs and thickness ratios of the top and bottom materials using the FE model. Crack propagation path is also predicted. We finally modify the geometry of the specimen to generate non-constant KI values as the crack propagates.",

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Aduloju, S, Gu, W, Truster, T, Emery, J, Reedy, D & Grutzik, SJ 2018, Designing brittle fracture specimens to investigate environmentally assisted crack growth. in RB Berke, GJ Pataky, AM Beese, J Carroll & S Xia (eds), Fracture, Fatigue, Failure and Damage Evolution - Proceedings of the 2017 Annual Conference on Experimental and Applied Mechanics. Conference Proceedings of the Society for Experimental Mechanics Series, vol. 7, Springer New York LLC, pp. 25-33, Annual Conference and Exposition on Experimental and Applied Mechanics, 2017, Indianapolis, United States, 06/12/17. https://doi.org/10.1007/978-3-319-62831-8_5

Designing brittle fracture specimens to investigate environmentally assisted crack growth. / Aduloju, Sunday; Gu, Wenjia; Truster, Timothy et al.
Fracture, Fatigue, Failure and Damage Evolution - Proceedings of the 2017 Annual Conference on Experimental and Applied Mechanics. ed. / Ryan B. Berke; Garrett J. Pataky; Alison M. Beese; Jay Carroll; Shuman Xia. Springer New York LLC, 2018. p. 25-33 (Conference Proceedings of the Society for Experimental Mechanics Series; Vol. 7).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Designing brittle fracture specimens to investigate environmentally assisted crack growth

AU - Aduloju, Sunday

AU - Gu, Wenjia

AU - Truster, Timothy

AU - Emery, John

AU - Reedy, Dave

AU - Grutzik, Scott J.

PY - 2018

Y1 - 2018

N2 - Subcritical crack growth can occur in a glass when the stress intensity factor is less than the fracture toughness if water molecules are present. A novel bi-material beam specimen is proposed to investigate environmentally assisted crack growth (EACG). Two materials with different coefficients of thermal expansion are diffusion bonded at high temperature and cooled to the room temperature which introduces residual stress in the beam. A Finite element (FE) model is developed and initially validated with an analytical model. Steady-state crack (SSC) depth at which mode II stress intensity factor (KII) is zero and the corresponding mode I stress intensity factor (KI) value are obtained for different material pairs and thickness ratios of the top and bottom materials using the FE model. Crack propagation path is also predicted. We finally modify the geometry of the specimen to generate non-constant KI values as the crack propagates.

AB - Subcritical crack growth can occur in a glass when the stress intensity factor is less than the fracture toughness if water molecules are present. A novel bi-material beam specimen is proposed to investigate environmentally assisted crack growth (EACG). Two materials with different coefficients of thermal expansion are diffusion bonded at high temperature and cooled to the room temperature which introduces residual stress in the beam. A Finite element (FE) model is developed and initially validated with an analytical model. Steady-state crack (SSC) depth at which mode II stress intensity factor (KII) is zero and the corresponding mode I stress intensity factor (KI) value are obtained for different material pairs and thickness ratios of the top and bottom materials using the FE model. Crack propagation path is also predicted. We finally modify the geometry of the specimen to generate non-constant KI values as the crack propagates.

KW - Crack growth

KW - Self-loading

KW - Steady-state

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T3 - Conference Proceedings of the Society for Experimental Mechanics Series

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BT - Fracture, Fatigue, Failure and Damage Evolution - Proceedings of the 2017 Annual Conference on Experimental and Applied Mechanics

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ER -

Aduloju S, Gu W, Truster T, Emery J, Reedy D, Grutzik SJ. Designing brittle fracture specimens to investigate environmentally assisted crack growth. In Berke RB, Pataky GJ, Beese AM, Carroll J, Xia S, editors, Fracture, Fatigue, Failure and Damage Evolution - Proceedings of the 2017 Annual Conference on Experimental and Applied Mechanics. Springer New York LLC. 2018. p. 25-33. (Conference Proceedings of the Society for Experimental Mechanics Series). doi: 10.1007/978-3-319-62831-8_5

Designing brittle fracture specimens to investigate environmentally assisted crack growth

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