Engineering assessment of ductile tearing in uniaxial and biaxial tension |
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| Affiliation: | 1. G.S. Pisarenko Institute for Problem of Strength, Kyiv 01014, Ukraine;2. Department of Engineering, University of Reading, Whiteknights, Reading RG6 6AY, UK;1. Department of Materials Science and Engineering, Texas A&M University, College Station, TX, USA;2. Faculty of Mechanical Engineering, Technion - Israel Institute of Technology, Haifa, Israel;1. Frantsevich Institute for Problems of Materials Science, 3 Krzhyzhanivsky Str., Kyiv 03680, Ukraine;2. Physico-Technological Institute of Metals and Alloys NAS of Ukraine, 34/1 Vernadsky Ave., Kyiv 142 03680, Ukraine;3. Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, Sendai 980-8577, Japan;4. National Technical University of Ukraine “Kyiv Polytechnic Institute”, Engineering-Physical Faculty, 35 Polytekchnichna Str., Kyiv 03056, Ukraine;1. V.I.Il’ichev Pacific Oceanological Institute, FEB RAS, 43, Baltiyskaya Street, Vladivostok 690041, Russia;2. Far Eastern Federal University, 8, Sukhanova Street, Vladivostok 690950, Russia;3. Water Problems Institute, RAS, 3, Gubkina Street, Moscow 119333, Russia;1. Lesya Ukrainka Eastern European National University, Avenue Voli 13, Lutsk 43025, Ukraine;2. Semiconductor Physics Department and Institute of Applied Research of Vilnius University, Avenue Saulėtekio 9/3, LT-10222 Vilnius, Lithuania |
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| Abstract: | To decide between clearly different approaches for engineering assessment of plane stress tearing, we performed uniaxial and biaxial tensile tests on middle-cracked specimens at various in-plane constraint states. Attention was focused on determination of the crack tip opening spacing δn, crack tip opening angle ψc, crack mouth opening angle αs, energy dissipation rate R, and specific work of fracture As. Our experimental results demonstrate that the values of δn, ψc, αs, R, and As for a high-strength low-hardening aluminium alloy all depend on the specimen geometry, its size, and the load biaxiality ratio. However, assessment of ductile tearing by interconnected characteristic quantities αs and As is more preferable over the use of δn, ψc, and R values for a number of basically important reasons discussed in this paper. |
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