Abstract
In many engineering applications, Mode-III type loading in the crack tip region is more common. Since loading in structures oftentimes is quite complex, the crack tip region generally experiences Mixed-Mode conditions. In this work, torsional loading experiments are performed by employing a modified spirally cracked cylindrical specimen. The cylindrical specimen used in all experiments is machined to incorporate a full revolution, spiral v-notch crack. The v-notch crack is inclined at an angle of 67.5° with respect to the specimen centerline to obtain Mixed-Mode (I/III) crack tip conditions under torsional loading. By combining the experimental measurements with detailed numerical simulations, the Mixed-Mode (I/III) fracture parameters for polycarbonate (PC) are quantified using an interaction integral method. The elastic-viscoplastic material response of the PC material, required for numerical simulations, is determined by performing standard tensile loading experiments. The Mixed-Mode (I/III) fracture toughness, as well as the stress intensity factors for Mode-I and Mode-III crack tip conditions are presented and discussed.
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Acknowledgments
The support provided by the Ministry of Higher Education and Scientific Research, University of Al-Qadisiyah, College of Engineering, Mechanical Engineering Department, Iraq is greatly acknowledged. The support of the Department of Mechanical Engineering at the University of South Carolina and the Center for Mechanics, Materials, and NDE in the development and maintenance of the dynamic experimental equipment is deeply appreciated. The support of Dr. Jordan at the Air Force Office of Scientific Research and the Department of Defense DURIP program is gratefully appreciated.
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Fahem, A.F., Gupta, V., Kidane, A., Sutton, M.A. (2021). Determination of Mixed-Mode (I/III) Fracture of Polycarbonate. In: Xia, S., Beese, A., Berke, R.B. (eds) Fracture, Fatigue, Failure and Damage Evolution , Volume 3. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-030-60959-7_13
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