D cook concepts and applications of finite element

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Unformatted text preview: s allows the bar to impact and realize its maximum deflection. Auto time stepping (AUTOTS) is used to control the time step increments. The large deflection effects are included using NLGEOM. Solution efficiency is improved by relaxing the convergence criteria (CNVTOL). 3. The 2-D axisymmetric analysis with PLANE42 elements fails to converge due to excessive element distortion or collapse (Figure C8.2: “Deformed Shape”). The element distortion can be attributed to an increased stiffness in element edges along the axis of symmetry resulting from dropped extra shape functions. The axisymmetric formulation removes extra shape functions along the axis of symmetry, hence incompressibility associated with large-strain plasticity is not maintained. 4. In comparison, the plane and solid elements perform equally well as the viscoplastic elements for the strain levels encountered in this problem. Introducing a rate-dependent material property to the problem would illustrate advantage to viscoplastic elements. 5. Using POST26, plots of the displacement vs. time (Figure C8.2:...
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This note was uploaded on 12/09/2010 for the course DEPARTMENT E301 taught by Professor Kulasinghe during the Spring '09 term at University of Peradeniya.

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