Abstract
In this work has been estimated the compressive strength of a unidirectional lamina of a carbon/epoxy composite material, using the cross-ply and angle-ply laminates. Over the years various methods have been developed to deduce compressive properties of composite materials reinforced with long fibres. Each of these methods is characterized by a specific way of applying load to the specimen. The method chosen to perform the compression tests is the Wyoming Combined Loading Compression (CLC) Test Method, described in ASTM D 6641 / D 6641M-09. This method presents many advantages, especially: the load application on the specimen (end load combined with shear load), the reproducibility of measurements and the experimental equipment quite simplified. Six different laminates were tested in compressive tests. They were realized by the same unidirectional prepreg, but with different stacking sequences: two cross-ply [0/90]ns, two angle-ply [0/90/±45]ns and two unidirectional laminates [0]ns and [90]ns. The estimate of the compressive strength of the unidirectional laminates at 0°, was done by an indirect analytical method, developed from the classical lamination theory, and which uses a multiplicative parameter known as Back-out Factor (BF). The BF is determined by using the experimental values obtained from compression tests.
Highlights
S ince the ’70s, many test methods have been developed to estimate the compressive properties of advanced composite materials
The results showed that failure strengths determined by using cross-ply and angle-ply specimens and Back-out Factors are about twice to those obtained for 0° unidirectional specimens
The values of strengths, determined by linear lamination theory, are in agreement with those reported in the data sheet of the prepreg used to make our composite materials
Summary
S ince the ’70s, many test methods have been developed to estimate the compressive properties of advanced composite materials. Depending on the way the load is applied, the mechanical characterization can be performed by the following methods: Shear Loaded, End Loaded, Sandwich-Beam and Combined Loaded Specimen Test Methods [1]. A unidirectional Carbon Fiber Reinforced Polymer is characterized using the Combined Loading Compression (CLC) Test Method [2]. ‐ the combined load allows to test untabbed straight-sided specimens avoiding high stress concentrations;. ‐ the simple test method allows to obtain repeatable results;. The direct experimental determination of compressive strength of a carbon/epoxy unidirectional lamina, through mechanical test of 0° composite laminates, leads to an underestimation due to fibre micro-buckling failure [3]. In this paper, the indirect determination of the compressive strength by testing cross-ply and angle-ply laminates is used
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
