Comparison of a composite model and an individually fiber and matrix discretized model for kink band formation

• Published in: International journal of non-linear mechanics Vol. 67; pp. 319 - 325
• Main Authors: Wind, Jens Lycke, Steffensen, Søren, Jensen, Henrik Myhre
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2014
• Subjects: Compressive properties; Failure analysis; Fiber composites; Fibers; Kink bands; Mathematical analysis; Mathematical models; Oriented fiber composites; Postbuckling; Strain localization; Fiber composites; Kink bands; Strain localization
• ISSN: 0020-7462; 1878-5638
• DOI: 10.1016/j.ijnonlinmec.2014.10.005

Failure by kink band instability in a unidirectional fiber composite is analyzed. A micromechanical discretized finite element model is used and compared to an existing composite constitutive model. The comparison is made in a fiber angle vs. applied compressive stress space. An investigation on the relation between the kink band angle and the fiber angle is conducted in the postbuckling regime. The critical kink band angle is examined for different initial fiber misalignment angles. •We introduce an individually fiber and matrix discretized finite element model.•Comparison is made with an existing constitutive kink band model.•It is shown that the kink band angle rotates as the fiber rotation is evolving.•The kink band angle is found for different initial fiber misalignments.