Initiation and evolution of transverse matrix cracks in composite laminates

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Damage due to matrix cracks in a laminate with symmetric, but otherwise general laminate stacking sequence (LSS) is predicted by a novel analytical solution for the damage activation function and a return mapping algorithm to restore equilibrium upon damage. In order to use Hahn's energy criterion, the strain energy release rates in mode I and II are calculated analytically from novel expressions for the degrading stiffness of a cracking lamina embedded in a laminate. The degrading stiffness is calculated using shear lag analysis of the cracked lamina. Provision for multiple laminae damaging simultaneously under in-plane state of stress/strain is achieved by a modified return mapping algorithm. A novel definition of composite damage model (CDM)-inspired damage variables allows crack density to be used as state variable. The proposed formulation accurately predicts crack initiation, evolution, degraded stiffness, and stress redistribution.

Original languageEnglish (US)
Title of host publicationSAMPE '09 Spring Symposium Conference Proceedings: Changing Times. New Opportunities. Are You Prepared?
Volume54
StatePublished - 2009
EventSAMPE '09 Spring Symposium Conference Proceedings - Baltimore, MD, United States
Duration: May 18 2009May 21 2009

Other

OtherSAMPE '09 Spring Symposium Conference Proceedings
CountryUnited States
CityBaltimore, MD
Period5/18/095/21/09

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

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