Void growth and interaction experiments: Implications to the optimal straining rate in superplastic forming |
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| Affiliation: | 1. Department of Computational Mechanics, School of Mechanical Engineering, University of Campinas, Campinas 13083-860, SP, Brazil;2. School of Civil Engineering, State University of Mato Grosso campus Tangará da Serra, Tangará da Serra 78300-000, MT, Brazil;1. National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China;2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an 710072, China;3. Centre of Advanced Materials Processing and Manufacturing, The University of Queensland, St Lucia, QLD 4072, Australia |
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| Abstract: | In this work, a set of parametric experiments was conducted on a superplastic material (eutectic tin–lead alloy) with one or more pre-drilled holes in each specimen. The small-sized holes were for simulating microvoids that occur and grow during superplastic forming. All holes were axially aligned with the tensile axis. The results revealed an increase in ductility with the number of holes up to 10 holes and a decrease thereafter. The ductility enhancement was explained based on the m-curve as due to a rise in the strain rate sensitivity locally around the holes. The decrease was explained due to strong void interaction that resulted in shear failure. This was further verified by a separate set of experiments of only two interacting voids with various interspacing. Finally, the void size versus applied strain was fully characterized and the results supported the ductility observations. |
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