Further development of dynamic analysis capability in the VAST finite element program for pre-stressed engine mount structures


  1. Jiang, L.
  2. Chernuka, M.W.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);MARTEC Ltd, Halifax NS (CAN)
This report presents work done in a recent contract for providing an effective and reliable nonlinear capability in the VAST finite element program for predicting dynamic characteristics of rubber engine mount structures subjected to initial finite static deformations. The convergence behaviour of the 8-noded co-rotational solid element previously implemented in VAST for large strain analyses of hyperelastic materials was first investigated. The results of this investigation suggested that the convergence problem was related to the definition of the co-rotational strain measure, which may be inadequate for representing the complicated strain field occurring in large strain analyses. Based on this conclusion, two new solid elements, which are 20-noded and 8-noded, respectively, have been implemented in VAST using the total Lagrangian formulation with mixed displacement/pressure interpolations. The newly developed solid elements have been applied to a large number of test problems involving large displacements/rotations, elasto-plasticity and large strain hyperelastic deformations. Excellent agreement between the VAST predictions and published solutions was obtained. TRUNCATED

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Engine mounts;Vibration isolation;Diesel engine vibration;Nonlinear finite element method;Hyperelastic material;Pre-stress
Report Number
DREA-CR-2001-140 — Contractor Report
Date of publication
01 Sep 2001
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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