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Title: Residually Stressed Bimaterial Beam Specimen for Measuring Environmentally Assisted Crack Growth

Abstract

Background: Subcritical crack growth can occur in a brittle material when the stress intensity factor is smaller than the fracture toughness if an oxidizing agent (such as water) is present at the crack tip. Objective: Here we present a novel bi-material beam specimen which can measure environmentally assisted crack growth rates. The specimen is “self-loaded” by residual stress and requires no external loading. Methods: Two materials with different coefficient of thermal expansion are diffusion bonded at high temperature. After cooling to room temperature a subcritical crack is driven by thermal residual stresses. A finite element model is used to design the specimen geometry in terms of material properties in order to achieve the desired crack tip driving force. Results: The specimen is designed so that the crack driving force decreases as the crack extends, thus enabling the measurement of the crack velocity versus driving force relationship with a single test. The method is demonstrated by measuring slow crack growth data in soda lime silicate glass and validated by comparison to previously published data. Conclusions: The self-loaded nature of the specimen makes it ideal for measuring the very low crack velocities needed to predict brittle failure at long lifetimes.

Authors:
ORCiD logo [1];  [2];  [2];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Materials and Failure Modeling
  2. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Civil and Environmental Engineering
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1667433
Report Number(s):
SAND-2020-9886J
Journal ID: ISSN 0014-4851; 690699
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
Experimental Mechanics
Additional Journal Information:
Journal Volume: 61; Journal Issue: 2; Journal ID: ISSN 0014-4851
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; slow crack growth; glass fracture; environmentally assisted crack growth; crack propagation

Citation Formats

Grutzik, S. J., Aduloju, S., Truster, T., and Reedy, E. D.. Residually Stressed Bimaterial Beam Specimen for Measuring Environmentally Assisted Crack Growth. United States: N. p., 2020. Web. https://doi.org/10.1007/s11340-020-00659-5.
Grutzik, S. J., Aduloju, S., Truster, T., & Reedy, E. D.. Residually Stressed Bimaterial Beam Specimen for Measuring Environmentally Assisted Crack Growth. United States. https://doi.org/10.1007/s11340-020-00659-5
Grutzik, S. J., Aduloju, S., Truster, T., and Reedy, E. D.. Wed . "Residually Stressed Bimaterial Beam Specimen for Measuring Environmentally Assisted Crack Growth". United States. https://doi.org/10.1007/s11340-020-00659-5. https://www.osti.gov/servlets/purl/1667433.
@article{osti_1667433,
title = {Residually Stressed Bimaterial Beam Specimen for Measuring Environmentally Assisted Crack Growth},
author = {Grutzik, S. J. and Aduloju, S. and Truster, T. and Reedy, E. D.},
abstractNote = {Background: Subcritical crack growth can occur in a brittle material when the stress intensity factor is smaller than the fracture toughness if an oxidizing agent (such as water) is present at the crack tip. Objective: Here we present a novel bi-material beam specimen which can measure environmentally assisted crack growth rates. The specimen is “self-loaded” by residual stress and requires no external loading. Methods: Two materials with different coefficient of thermal expansion are diffusion bonded at high temperature. After cooling to room temperature a subcritical crack is driven by thermal residual stresses. A finite element model is used to design the specimen geometry in terms of material properties in order to achieve the desired crack tip driving force. Results: The specimen is designed so that the crack driving force decreases as the crack extends, thus enabling the measurement of the crack velocity versus driving force relationship with a single test. The method is demonstrated by measuring slow crack growth data in soda lime silicate glass and validated by comparison to previously published data. Conclusions: The self-loaded nature of the specimen makes it ideal for measuring the very low crack velocities needed to predict brittle failure at long lifetimes.},
doi = {10.1007/s11340-020-00659-5},
journal = {Experimental Mechanics},
number = 2,
volume = 61,
place = {United States},
year = {2020},
month = {9}
}

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