Development of a Dynamic Analysis Capability in the Vast Finite Element Code 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)
The work presented in this report was motivated by the results of a previous frequency response analysis of a pre-stressed block rubber engine mount using the 20-noded solid element in the VAST finite element program. These results indicated that when the geometric stiffness matrix was included, the acoustic stiffness of the mount was significantly underestimated. In order to investigate the cause of this discrepancy in the numerical solutions, an extensive finite element study of the engine mount was first carried out in the present contract using VAST and other commercial FE packages. The results from this numerical study confirmed the correctness of the VAST element, but also clearly revealed the need for a nonlinear hyperelastic material model in order to accurately characterize the dynamic behaviour of the pre-stressed engine mount structures. After a survey of the state-of-the-art literature on finite procedures for large strain problems, it was concluded that the co-rotational formulation for the 3D solid element proposed by Crisfield and co-workers was especially suitable for implementation into the VAST program. TRUNCATED
Pre-stress;Hyperelastic material;Engine mounts;Finite element method
Report Number
DREA-CR-1999-090;MARTEC-TR-99-18 — Contractor Report
Date of publication
01 Apr 1999
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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