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Title: A method for evaluating the fatigue crack growth in spiral notch torsion fracture toughness test

Journal Article · · Archive of Applied Mechanics (1991)
ORCiD logo [1];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Vermont, Burlington, VT (United States)
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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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1439941
Journal Information:
Archive of Applied Mechanics (1991), Vol. Special; ISSN 0939-1533
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

References (12)

A New Approach to Evaluate Fracture Toughness of Structural Materials journal November 2004
Investigating fracture behavior of polymer and polymeric composite materials using spiral notch torsion test journal March 2013
Evaluating Stress-Corrosion Cracking Susceptibility Using a Torsion Test conference January 2005
Oak Ridge National Laboratory (ORNL) spiral notch torsion test (SNTT) system journal August 2003
A new test method for determining the fracture toughness of concrete materials journal March 2010
Measurement of Fracture Toughness of Materials With Non-Uniform Microstructure Based on Spiral Notch Torsion Test
  • Zhang, Wei; Feng, Zhili; Wang, Jy-An
  • ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference, ASME 2010 Pressure Vessels and Piping Conference: Volume 6, Parts A and B https://doi.org/10.1115/PVP2010-26112
conference January 2010
Using torsional bar testing to determine fracture toughness journal November 2000
Fractographic study of epoxy under mode I and mixed mode I/III loading journal January 2012
A new approach for evaluating thin film interface fracture toughness journal June 2006
Interface fracture toughness evaluation for MA956 oxide film journal December 2005
The development of in situ fracture toughness evaluation techniques in hydrogen environment journal January 2015
An innovative technique for evaluating fracture toughness of graphite materials journal October 2008

Figures / Tables (9)

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36 MATERIALS SCIENCE
Spiral notch torsion test
Fracture toughness
Fatigue pre-crack