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TECHNICAL PAPERS

A Micromechanics-Based Finite Element Model for Compressive Failure of Notched Uniply Composite Laminates Under Remote Biaxial Loads

[+] Author and Article Information
Jung H. Ahn, Anthony M. Waas

Composite Structures Laboratory, Department of Aerospace Engineering, The University of Michigan, FXB Building, Ann Arbor, MI 48109-2140

J. Eng. Mater. Technol 121(3), 360-366 (Jul 01, 1999) (7 pages) doi:10.1115/1.2812387 History: Received April 03, 1998; Revised June 15, 1998; Online November 27, 2007

Abstract

A micromechanics based failure initiation predictive capability for analyzing notched composite laminates loaded remotely in multiaxial compression is reported. The model relies on the results from a previous experimental study that investigated compression failure mechanisms in special “uniply” composite laminates. The finite element method (FEM) was used in the solution process. The experimental results showed that the dominant mode of failure initiation was kink banding near the hole edge. The kink band was confined in extent to a distance within one half of the hole radius. The fibers within the kink band were rotated both in plane and out of the plane of the laminate. The position of the kink band with respect to the center of the notch depended on the remote biaxial load ration. In the FEM, the region in which kink banding takes place is contained within a finite size rectangular area, and is meshed as an alternatingly stacked region of fiber and matrix layers. The values of boundary loads on this rectangular area which correspond to kink banding is related to the remotely applied loads via an available closed form analysis for orthotropic laminates. Good agreement is found between experiment and analysis for a wide range of notch sizes.

Copyright © 1999 by The American Society of Mechanical Engineers
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