Tensile-shear transition in mixed mode I/III fracture |
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| Affiliation: | 1. Department of Engineering, Payame Noor University, PO BOX 19395-3697, Tehran, Iran;2. Welding and Joining Research, School of Industrial Engineering, Iran University of Science and Engineering – (IUST), Narmak, 16846-13114 Tehran, Iran;1. Fatigue and Fracture Research Laboratory, Center of Excellence in Experimental Solid Mechanics and Dynamics, School of Mechanical Engineering, Iran University of Science and Technology, Narmak 16846, Tehran, Iran;2. Fracture Research Laboratory, Faculty of New Sciences and Technologies, University of Tehran, P.O. Box 13741-4395, Tehran, Iran;3. Department of Management and Engineering, University of Padua, Stradella San Nicola 3, 36100 Vicenza, Italy;4. NTNU Department of Engineering Design and Materials, Richard Birkelands vei 2b, 7491 Trondheim, Norway;1. Department of Aerospace, Physics, and Space Sciences, Florida Institute of Technology, Melbourne, FL 32901, USA;2. Welding and Joining Research Center, School of Industrial Engineering, Iran University of Science and Technology (IUST), Narmak, 16846-13114, Tehran, Iran;3. Faculty of Art, Semnan University, 35131-19111, Semnan, Iran |
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| Abstract: | The propensity of the transition of fracture type in either brittle or ductile cracked solid under mixed-mode I and III loading conditions is investigated. A fracture criterion based on the competition of the maximum normal stress and maximum shear stress is utilized. The prediction of the fracture type is determined by comparing τmax/σmax at a critical distance from the crack tip to the material strength ratio τC/σC, i.e., (τmax/σmax)<(τC/σC) for tensile fracture and (τmax/σmax)>(τC/σC) for shear fracture, where σC (τC) is the fracture strength of materials in tension (shear). Mixed mode I/III fracture tests were performed using circumferentially notched cylindrical bars made of PMMA and 7050 aluminum alloy. Fracture surface morphology of the specimens reveals that: (1) for the brittle material, PMMA, only tensile type of fracture occurs, and (2) for the ductile material, 7050 aluminum alloy, either tensile or shear type of fracture occurs depending on the mode mixity. The transition (in ductile material) or non-transition (in brittle material) of the fracture type and the fracture path observed in experiments were properly predicted by the theory. Additional test data from open literature are also included to validate the proposed theory. |
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