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Carbon Unidirectional Composite Flexure Strength Dependence on Laminate Thickness

T.J. ROSE, AJAY SHARMA, ANDREW SEAMONE, FRANCISCO LOPEZ JIMÉNEZ, TOM MURPHEY

Abstract


A study to develop fundamental failure prediction methods for high strain composites (HSCs). As their name implies, HSCs are designed to operate at strains significantly larger than traditional composites, particularly under bending. Several different phenomena at the micro-scale level contribute to this remarkable flexibility, which are not addressed by standard protocols such as those defined in CHM-17. This investigation presents a first step towards the development of new set of standard tests and failure criteria able to characterize the specific mechanics of HSCs. In particular, we present testing on the large curvature bending of HSC laminates performed using the column bend test (CBT) method. The samples are made from unidirectional intermediate modulus carbon fibers set in a toughened aerospace epoxy matrix, with the thickness varied systematically, in order to explore its effect. Samples were tested until failure and then imaged using SEM and micro-CT x-ray methods in an attempt to understand the failure mode. These results were then compared to linear multiscale material model, where the modeling methods are focused on relative fiber stress/strain relationship. Further investigation will build upon these results by incorporating fiber and matrix material nonlinearity as well as composite layup shear stabilization methods.


DOI
10.12783/asc33/26023

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