Recommendations for the determination of valid mode II fracture toughnesses K{sub IIc}
From a discussion of the sizes of the plastic zones at the tip of a crack under shear (Mode II) and tensile (Mode I) conditions of loading, hypotheses on specimen size requirements are derived for determining valid values of the shear fracture toughness K{sub IIc}. The following conclusions are drawn: The minimum specimen thickness for a K{sub IIc} test can be smaller, but the minimum in-plane specimen dimensions should be larger than for a K{sub Ic} test. For verification of these hypotheses, Mode II and additionally Mode I fracture toughnesses were determined for the aluminum alloy 7075 and the tool steel 90 MnCrV 8. Measurements were performed with specimens of different sizes with respect to the size of the crack tip plastic zones. The obtained data are in good agreement with the derived criteria for measuring Mode II fracture toughnesses K{sub IIc} and confirm their validity.
- Research Organization:
- Ruhr-Univ., Bochum (DE)
- OSTI ID:
- 20000275
- Report Number(s):
- CONF-9805206-; ISBN 0-8031-2602-6
- Resource Relation:
- Conference: Mixed-Mode Crack Behavior, Atlanta, GA (US), 05/06/1998--05/07/1998; Other Information: PBD: 1999; Related Information: In: Mixed-mode crack behavior. ASTM special technical publication 1325, by Miller, K.J.; McDowell, D.L. [eds.], 342 pages.
- Country of Publication:
- United States
- Language:
- English
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