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Journal of Composite Materials, Vol. 42, No. 13, 1359-1379 (2008)
DOI: 10.1177/0021998308092203

Recent Development of Planar Cruciform Experiment on Biaxial Tensile Deformation and Failure of Unidirectional Glass/Epoxy Composite

Luis Mailly

Department of Mechanical Engineering, and Composite Engineering and Applications Center, University of Houston, Houston, TX 77204-0931, USA, luis.mailly{at}mail.uh.edu

Su Su Wang

Department of Mechanical Engineering, and Composite Engineering and Applications Center, University of Houston, Houston, TX 77204-0931, USA

Inadequate experimental characterization of strength and deformation behavior of unidirectional fiber composites under planar biaxial stresses has hindered the development of complete material models. Here the recent development of a cruciform specimen with unidirectional gage section is presented, suitable to test glass/epoxy under combined high transverse and longitudinal tensile loads.

The experimental program developed comprises of six different biaxial tensile load ratios. The results show significant influence of longitudinal stress on transverse nonlinearity of a glass/epoxy. Failure loci and failure modes in biaxial tensile strain and stress domains are presented, indicating a reduction of transverse strength by high longitudinal loads.

Key Words: biaxial strength • failure modes • cruciform specimen • nonlinear behavior • unidirectional composite.


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