Determination of valid mode-II fracture toughnesses K_llc
by W. Hiese, J.F. Kalthoff
International Journal of Materials and Product Technology (IJMPT), Vol. 14, No. 2/3/4, 1999

Abstract: 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_llc. The following conclusions are drawn: The minimum specimen thickness for a K_llc test can be smaller, but the minimum in-plane specimen dimensions should be larger than for a K_llc test. For verification of these hypotheses, mode-II and. additionally, mode-I fracture toughnesses are determined for the aluminium alloy 7075 and the tool steel 90 MnCrV 8. Measurements are performed with specimens of different sizes with respect to [he size of the crack lip plastic zones. The obtained data are in good agreement with the derived criteria for measuring mode-II fracture toughnesses K_llc and confirm their validily.

Online publication date: Mon, 01-Nov-2010

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