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Analysis of the anisotropic viscoplastic-damage response of composite laminates - Continuum basis and computational algorithmsThe mathematical structure underlying the rate equations of a recently-developed constitutive model for the coupled viscoplastic-damage response of anisotropic composites is critically examined. In this regard, a number of tensor projection operators have been identified, and their properties were exploited to enable the development of a general computational framework for their numerical implementation using the Euler fully-implicit integration method. In particular, this facilitated (i) the derivation of explicit expressions of the (consistent) material tangent stiffnesses that are valid for both three-dimensional as well as subspace (e.g. plane stress) formulations, (ii) the implications of the symmetry or unsymmetry properties of these tangent operators from a thermodynamic standpoint, and (iii) the development of an effective time-step control strategy to ensure accuracy and convergence of the solution. In addition, the special limiting case of inviscid elastoplasticity is treated. The results of several numerical simulations are given to demonstrate the effectiveness of the schemes developed.
Document ID
19930059350
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Saleeb, A. F.
(NASA Lewis Research Center Cleveland, OH, United States)
Wilt, T. E.
(Akron Univ. OH, United States)
Date Acquired
August 16, 2013
Publication Date
May 30, 1993
Publication Information
Publication: International Journal for Numerical Methods in Engineering
Volume: 36
Issue: 10
ISSN: 0029-5981
Subject Category
Structural Mechanics
Accession Number
93A43347
Funding Number(s)
CONTRACT_GRANT: NAG3-901
Distribution Limits
Public
Copyright
Other

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