A method for evaluating the fatigue crack growth in spiral notch torsion fracture toughness test
Abstract
The spiral notch torsion test (SNTT) has been a recent breakthrough in measuring fracture toughness for different materials, including metals, ceramics, concrete, and polymers composites. Due to its high geometry constraint and unique loading condition, SNTT can be used to measure the fracture toughness with smaller specimens without concern of size effects. The application of SNTT to brittle materials has been proved to be successful. The micro-cracks induced by original notches in brittle materials could ensure crack growth in SNTT samples. Therefore, no fatigue pre-cracks are needed. The application of SNTT to the ductile material to generate valid toughness data will require a test sample with sufficient crack length. Fatigue pre-crack growth techniques are employed to introduce sharp crack front into the sample. Previously, only rough calculations were applied to estimate the compliance evolution in the SNTT crack growth process, while accurate quantitative descriptions have never been attempted. This generates an urgent need to understand the crack evolution during the SNTT fracture testing process of ductile materials. Here, the newly developed governing equations for SNTT crack growth estimate are discussed in the paper.
- Authors:
-
[1];
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of Vermont, Burlington, VT (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1439941
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Archive of Applied Mechanics (1991)
- Additional Journal Information:
- Journal Name: Archive of Applied Mechanics (1991); Journal Volume: Special; Journal ID: ISSN 0939-1533
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Spiral notch torsion test; Fracture toughness; Fatigue pre-crack
Citation Formats
Wang, Jy -An John, and Tan, Ting. A method for evaluating the fatigue crack growth in spiral notch torsion fracture toughness test. United States: N. p., 2018.
Web. doi:10.1007/s00419-018-1398-2.
Wang, Jy -An John, & Tan, Ting. A method for evaluating the fatigue crack growth in spiral notch torsion fracture toughness test. United States. https://doi.org/10.1007/s00419-018-1398-2
Wang, Jy -An John, and Tan, Ting. Mon .
"A method for evaluating the fatigue crack growth in spiral notch torsion fracture toughness test". United States. https://doi.org/10.1007/s00419-018-1398-2. https://www.osti.gov/servlets/purl/1439941.
@article{osti_1439941,
title = {A method for evaluating the fatigue crack growth in spiral notch torsion fracture toughness test},
author = {Wang, Jy -An John and Tan, Ting},
abstractNote = {The spiral notch torsion test (SNTT) has been a recent breakthrough in measuring fracture toughness for different materials, including metals, ceramics, concrete, and polymers composites. Due to its high geometry constraint and unique loading condition, SNTT can be used to measure the fracture toughness with smaller specimens without concern of size effects. The application of SNTT to brittle materials has been proved to be successful. The micro-cracks induced by original notches in brittle materials could ensure crack growth in SNTT samples. Therefore, no fatigue pre-cracks are needed. The application of SNTT to the ductile material to generate valid toughness data will require a test sample with sufficient crack length. Fatigue pre-crack growth techniques are employed to introduce sharp crack front into the sample. Previously, only rough calculations were applied to estimate the compliance evolution in the SNTT crack growth process, while accurate quantitative descriptions have never been attempted. This generates an urgent need to understand the crack evolution during the SNTT fracture testing process of ductile materials. Here, the newly developed governing equations for SNTT crack growth estimate are discussed in the paper.},
doi = {10.1007/s00419-018-1398-2},
journal = {Archive of Applied Mechanics (1991)},
number = ,
volume = Special,
place = {United States},
year = {2018},
month = {5}
}
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Figures / Tables:
Fig. 1: SNTT configuration.
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Works referenced in this record:
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Figures / Tables found in this record:
Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.