Stochastic damage evolution modeling in laminates

Research output: Contribution to conferencePaperpeer-review

Abstract

A stochastic mesomechanics model has been developed for damage accumulation analysis in advanced laminated composites by the author. The model is based on a theory of excursions of random process beyond the bounds. Stochastic strains in the laminate subjected to random Gaussian in-plane loading are calculated using lamination theory and random functions theory. Probabilistic variation of stiffness and strength characteristics of plies is used in the analysis. Stochastic version of maximum strain failure criterion is applied for damage probability calculation. A mesovolume concept is utilized in modeling stiffness degradation. The capabilities of model are illustrated by predictions of damage accumulation and failure in a Kevlar/epoxy [0/ ± 30/90]s laminate under quasistationary, long-term stationary, and cyclic loading. Effects of loading rate, deviation, stationary level and cyclic amplitude on damage evolution are discussed. The inversion of influence of loading deviation on laminate strength with varying loading rate is revealed and interpreted. High-cycle fatigue behavior of laminate is calculated utilizing the observed stages in failure accumulation under the cyclic loading.

Original languageEnglish (US)
Pages275-284
Number of pages10
StatePublished - 1994
Externally publishedYes
EventProceedings of the 8th Technical Conference of the American Society for Composites (ASC) - Cleveland, OH, USA
Duration: Oct 19 1993Oct 21 1993

Other

OtherProceedings of the 8th Technical Conference of the American Society for Composites (ASC)
CityCleveland, OH, USA
Period10/19/9310/21/93

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemical Engineering (miscellaneous)
  • Building and Construction
  • Polymers and Plastics

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