The growth of shear bands in composite microstructures |
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| Institution: | 1. Khalifa University, Abu Dhabi, United Arab Emirates;2. Imperial College, London, England;1. College of Geosciences, Texas A and M University, College Station, TX, USA;2. Department of Physics, University of Rome ”La Sapienza”, Rome, Italy;1. Department of Chemistry, Saint Mary''s University, Halifax, NS, CA;2. University Health Network, University of Toronto, Toronto, ON, CA;3. University Hospitals Cleveland Medical Center, Cleveland, OH, US;4. Department of Pathology, Case Western Reserve University, Cleveland, OH, US;5. Princess Margaret Cancer Centre/University Health Network, Toronto, ON, CA;6. Department of Medical Biophysics, University of Toronto, Toronto, ON, CA;7. Department of Physics, University of Toronto, Toronto, ON, CA;8. Department of Chemical and Physical Sciences, University of Toronto Mississauga, Mississauga, ON, CA |
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| Abstract: | Shear band formation in materials with inhomogeneous and composite microstructures is influenced by factors that usually do not come into play in monolithic materials. Experiments and calculations have shown that inhomogeneities in material properties enhance the localization of deformation. This investigation concerns the propagation of shear bands in a two-phase tungsten composite under the conditions of nominally pure shear deformation. Finite element calculations are carried out to delineate the effects of different grain–matrix morphologies. In the numerical models, the initiation of shear bands is triggered by a notch, simulating the effect of defects such as microcracks and microvoids in materials. Calculations demonstrate that phase morphology, particle size and the relative location of initiation site have significant influences on the development of localized deformation. The work and energy evolutions are tracked for each constituent phase in the microstructures. In addition, the exchange of thermal energy through heat flow between the phases is analyzed. The results show that a strong correlation exists between the course of shear band propagation and the thermomechanical coupling between microscopic phases. |
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