Mechanical Engineering Faculty Research


Elastic and Visco-elastic Response of Finite Particle Junctions in Granular Materials

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The elastic deformation of granular materials has been studied extensively using two-particle Hertzian contact-based local deformation regulations. Here we use a finite element simulation, which shows excellent agreement with the infinitesimal contact limit relations, to derive force-displacement relations for finite size particle junctions. The response is determined for both normal and tangential inter-particle deformation. Additionally, the strong influence of particle packing, or coordination, on the apparent junction stiffness is demonstrated using a finite element analysis of several periodic particle arrangements, with both normal and tangenital deformation at the inter-particle junctions. The importance of accounting for both the junction size effect and coordination is demonstrated by comparing computed effective moduli with published experimental values.

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Recent Developments in Computer Modeling of Powder Metallurgy Processes

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