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2018 | OriginalPaper | Chapter

Biaxial Tensile Tests and Microstructure-Based Inverse Parameter Identification of Inhomogeneous SMC Composites

Authors : Malte Schemmann, Sebastian Gajek, Thomas Böhlke

Published in: Advances in Mechanics of Materials and Structural Analysis

Publisher: Springer International Publishing

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Abstract

Discontinuous fiber reinforced composites offer great advantages for high-volume lightweight components. The characterization of their process-dependent, macro-heterogeneous, anisotropic mechanical behavior presents, however, a challenge to composite material science. Biaxial tensile tests allow for the loading of various stress states on the specimen. The inhomogeneous stress and strain fields require an inverse parameter identification. Previous biaxial tensile tests in the elastic range showed fluctuations in the elastic properties within one specimen. Micro CT scans suggested that some of these fluctuations derive from an inhomogeneous fiber orientation distribution. The identification of a generally inhomogeneous stiffness leads, however, to an ill-posed problem which does not allow for a unique solution. We introduce the assumption of linearity between the stiffness tensor and the fiber orientation distribution. This simplification reduces the problem size to five degrees of freedom per specimen which do not depend on fiber orientation distribution. Four of these parameters are identifiable and are determined in a Gauss-Newton type optimization procedure.

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Title: Biaxial Tensile Tests and Microstructure-Based Inverse Parameter Identification of Inhomogeneous SMC Composites
Authors: Malte Schemmann
Sebastian Gajek
Thomas Böhlke
Publisher: Springer International Publishing
Book: Advances in Mechanics of Materials and Structural Analysis
Print ISBN: 978-3-319-70562-0

Electronic ISBN: 978-3-319-70563-7

Copyright Year: 2018
DOI: https://doi.org/10.1007/978-3-319-70563-7_15

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