journal article·2021-01Open access

Numerical and experimental investigation of out-of-plane fiber waviness on the mechanical properties of composite materials

M. Thor, U. Mandel, M. Nagler, F. Maier, J. Tauchner, M. G. R. Sause, R. M. Hinterhölzl

Abstract

Abstract The limited capability to predict material failure in composite materials and specifically in wavy composite layers has led to high margins of safety for the design of composite structures. Thus, the full lightweight potential of this class of materials is left unused. To understand the complex failure behavior of composite materials containing out-of-plane fiber waviness under compressive and tensile loading, a non-linear 2D material model was implemented in ABAQUS and validated with extensive experimental test data from compression and tensile tests. Each test was recorded by a stereo camera system for digital image correlation to resolve damage initiation and propagation in detail. This study has shown excellent agreement of numerical simulations with experimental data. In a virtual testing approach various parameters, i.e. amplitude, wavelength and laminate thickness, have been studied. It was found that the failure mode changed from delamination to kink shear band formation with increasing laminate thickness. The wavelength has shown minor influences compared to amplitude and laminate thickness.
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Research context

OpenAlex topics: Mechanical Behavior of Composites · Textile materials and evaluations · Structural Analysis of Composite Materials

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