Matrix Strain Increase Factors in Unidirectional Fibers-Reinforced Laminae

What is it about?

This paper presents computational matrix strain increase factors in case of parallel hexagonal shape disposed fibers in unidirectional fibers-reinforced laminae subjected to transverse loadings. Matrix strain increase factors for two shapes of disposed fibers in a unidirectional glass and HM-carbon fibers-reinforced epoxy resin lamina are given. A comparison between matrix strain increase factors in case of square shape and hexagonal shape disposed fibers for these types of laminae are also presented.

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Why is it important?

With the increase of fibers volume fraction in a composite laminate, increases also the matrix strain increase factor. In case of hexagonal shape disposed fibers, the matrix strain increase factor presents lower values than the square shape disposed fibers, which indicates that the hexagonal shape is more advantageous being closer to reality. Moreover, at fibers volume fractions over 40%, the difference between these two factors increases. This is more significant in case of glass fibers-reinforced lamina than the HM-carbon fibers-reinforced lamina, as well as in the case of square shape disposed fibers than the hexagonal shape disposed fibers.

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