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A Multi-Level Superelement Technique for Damage Analysis

[+] Author Affiliations
J. P. Fan, C. Y. Tang

Hong Kong Polytechnic University, Kowloon, Hong Kong

C. L. Chow

University of Michigan at Dearborn, Dearborn, MI

Paper No. IMECE2002-39190, pp. 215-220; 6 pages
doi:10.1115/IMECE2002-39190
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Materials: Processing, Characterization and Modeling of Novel Nano-Engineered and Surface Engineered Materials
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Materials Division
  • ISBN: 0-7918-3640-1 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

A multi-level superelement technique is applied to model the effects of circular voids on the effective elastic properties of a material. A two-dimensional representative volume element with a circular void in its center is initially modeled by a superelement. Using this superelement, a thin planar material with circular voids is constructed. The finite element computation is then conducted to estimate the effective Young’s modulus, Poisson’s ratio and the shear modulus of the material using the ABAQUS code for different void sizes. The values of the isotropic damage variables, DE and DG , under various degree of damage are hence determined. These values are compared with those calculated by using a conventional micromechanics damage model. A new isotropic damage model is proposed based on the results of this analysis. To demonstrate the applicability of this damage model, an example case of a notched cylindrical bar under tensile loading is investigated.

Copyright © 2002 by ASME

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