Abstract
Composite materials are widely used in structural mechanics as they can withstand high loads; although after a while, they can present relative strain due to these loadings. In the present work, it is implemented digital image correlation using one laser-beam and the speckles created by its reflection to describe the mechanical behavior of fiber-reinforced composites submitted under compression test. Composites were tested in two set of arrays: the first was done with fibers orientated parallel to the load and the second was done with fibers randomly orientated, as it is known that the stress-strain evolution change according to the orientation of the fibers. Our method allows us to evaluate the heterogeneous strain evolution observed during the tests. Validity of optical strain-measurements is assessed against the results of an universal testing machine, a good correlation was found by comparing the results.
Highlights
It is important to measure local strain and stress distributions for understanding the mechanical properties of structural materials
This paper presents an alternative method for measuring deformation in composite materials, in which we use a laser beam focusing on the cross-section of our sample which is under a compression test; the studied material is formed by ARMEX plus concrete
We show the theoretical results of strains: ε obtained by the universal machine and εc obtained by Digital Image Correlation (DIC) technique
Summary
It is important to measure local strain and stress distributions for understanding the mechanical properties of structural materials. There are two methods to obtain those diagrams: contact and noncontact; in the former case, mechanics excels doing physical tests such as compression test, in which a material is placed in the universal machine, a continuous load is applied to it and the resulting deformation is measured [2].
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