A Time-Domain Finite Element Formulation for Transient Dynamic Linear Elasticity

Title & Authors
A Time-Domain Finite Element Formulation for Transient Dynamic Linear Elasticity
Sim, U-Jin; Lee, Seong-Hui;

Abstract
Transient linear elastodynamic problems are numerically analyzed in a time-domain by the Finite Element Method, for which the variational formulation based upon the equations of motion in convolution integral is newly derived. This formulation is implicit and does not include the time derivative terms so that the computation procedure is simple and less assumptions are required comparing to the conventional time-domain dynamic numerical algorithms, being able to get the improved numerical accuracy and stability. That formulation is expanded using the semi-discrete approximation to obtain the finite element equations. In the temporal approximation, the time axis is divided equally and constant and linear time variations are assumed in those intervals. It is found that unconditionally stable numerical results are obtained in case of the constant time variation. Some numerical examples are given to show the versatility of the presented formulation.
Keywords
Transient;Dynamic Elasticity;Finite Element Method;Elastic Wave;
Language
Korean
Cited by
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축대칭 문제에서의 동적 응력집중 해석,심우진;이성희;

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