ANSYS varification manual 9

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Unformatted text preview: Assumptions and Modeling Notes The problem is solved first using the nonlinear spring element (COMBIN39) and then using a spar element (LINK1) with nonlinear elastic material (nonlinear table). For the nonlinear spring element (COMBIN39), the nonlinear spring constant is converted to eleven discrete force-deflection points by F = kδ for δ = 0.0 to 1.0 in steps of 0.1 in. For the spar element (LINK1) with nonlinear elastic material, the nonlinear spring constant is converted to six discrete stress-strain points by σ = kδ/A and ε = δ/L for δ = 0.0 to 1.0 in steps of 0.2 in. The elastic modulus EX on the MP command must be greater than the maximum of σ/ε (= kL/A) and hence is assigned a value of 2kL/A = 12 x 104 psi. The IC command is used to impose the initial displacement and velocity configuration. The first load step is defined over a very small time step (.0002 sec) to allow the initial step change in acceleration to be attained. The integration time step for the second load step is base...
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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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