Journal Published Online: 01 April 1994
Volume 16, Issue 2

An Analytical and Experimental Evaluation of 0/90 Laminate Tests for Compression Characterization



For materials development and specification, accurate compressive property measurement with low variability is important, especially if the accuracy is improved by elimination of premature failure by buckling. Existing compression test methods do not satisfy these needs. For this reason the effectiveness of using 0/90 laminates for the determination of unidirectional (0°) compressive strength of composites was evaluated. The concept of using 0/90 laminates to evaluate lamina compressive strength exploits the transverse constraint provided by the 90° plies in combination with increased buckling stability obtained by positioning the 0° plies away from the neutral axis.

The studies were conducted using the SACMA SRM-1 compression tests for several material types that represent a broad range of fiber and matrix performance combinations. Laminate configuration and stacking sequence effects were evaluated over a range of temperatures up to 120°C. Additionally, load introduction factors, including tab type, tab design, and adhesive, were examined for effects on strength.

Under all conditions evaluated, the [90/0/0/90]s configuration was found to measure higher compressive strengths in the 0° plies than that determined for the same material using 0° coupons. The experimental findings could be explained by a numerical simulation of the SACMA type compression test. The simulation was based on a specially developed materials model designated COMPO-D which was implemented in the finite element code of DYNA-3D. The FEM analysis of the [90/0/0/90]s configuration explains the suppression of stress concentrations resulting in a more homogeneous distribution at the point of failure within the gage area.

Author Information

Wilson, DW
ASHRAE, Inc., Atlanta, GA
Altstädt, V
BASF AG, Ludwigshafen, Germany
Maier, M
Institut für Verbundwerkstoffe, Kaiserslautern, Germany
Prandy, J
American Cyanamid, Anaheim, CA
Thoma, K
CONDAT GmbH, Scheyern-Fernhag, Germany
Vinckier, D
CONDAT GmbH, Scheyern-Fernhag, Germany
Pages: 8
Price: $25.00
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Stock #: CTR10404J
ISSN: 0884-6804
DOI: 10.1520/CTR10404J