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A coupled/uncoupled deformation and fatigue damage algorithm utilizing the finite element methodA fatigue damage computational algorithm utilizing a multiaxial, isothermal, continuum based fatigue damage model for unidirectional metal matrix composites has been implemented into the commercial finite element code MARC using MARC user subroutines. Damage is introduced into the finite element solution through the concept of effective stress which fully couples the fatigue damage calculations with the finite element deformation solution. An axisymmetric stress analysis was performed on a circumferentially reinforced ring, wherein both the matrix cladding and the composite core were assumed to behave elastic-perfectly plastic. The composite core behavior was represented using Hill's anisotropic continuum based plasticity model, and similarly, the matrix cladding was represented by an isotropic plasticity model. Results are presented in the form of S-N curves and damage distribution plots.
Document ID
19940032054
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Wilt, Thomas E. (Toledo Univ. OH., United States)
Arnold, Steven M. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1994
Subject Category
Structural Mechanics
Report/Patent Number
NASA-TM-106526
E-8652
NAS 1.15:106526
Accession Number
94N36561
Funding Number(s)
CONTRACT_GRANT: NCC3-248
PROJECT: RTOP 505-63-12
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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