A continuum damage model to predict the influence of ply waviness on stiffness and strength in ultra-thick unidirectional Fiber-reinforced Plastics

Andreas Altmann, Robin Taubert, Ulrich Mandel, Roland Hinterhoelzl, Klaus Drechsler

Research output: Contribution to journalReview articlepeer-review

13 Citations (Scopus)

Abstract

Ply waviness is a commonly observed manufacturing defect of ultra-thick composite materials essentially affecting stiffness, strength, and fatigue behavior of the composite. A specimen's geometry is designed to represent the failure mechanisms in thick wavy laminates, typically observed in spar caps of today's wind turbine blades. A material model is developed to simulate the phenomenological processes in wavy laminates to obtain a strength knock-down. Particular attention is taken on the nonlinear shear behavior and kink band formation. The presented model correlates well with results achieved by experiments. This paper shows a significantly higher influence of compressive compared with tensile loading on the mechanical material behavior of wavy laminates.

Original languageEnglish
Pages (from-to)2739-2755
Number of pages17
JournalJournal of Composite Materials
Volume50
Issue number20
DOIs
Publication statusPublished - 1 Aug 2016

Keywords

  • continuum damage model
  • effects of defects
  • matrix systems
  • Wavy composites

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