A method for studying the crumpling of unidirectional composite material based on the computational micromechanics is proposed. A micromechanical model is used to study the elasticity and strength of a unidirectional composite material in crumpling under a fastener. The model simulates the test results on a semisample with a hole of diameter 6 mm. The effect of contact friction and fiber defects on the elastic modulus of crumpling is shown on a model that takes into account only the geometric nonlinearity. On a model with elastic-plastic properties of the matrix, the formation features of kink bands in fibers are shown and the sequence of damage initiation during crumpling is revealed. The relations obtained can be taken into account when creating a damage model of the homogenized material of a unidirectional composite layer and studying the crumpling on multidirectional lay-ups.
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Translated from Mekhanika Kompozitnykh Materialov, Vol. 58, No. 4, pp. 715-734, July-August, 2022. Russian DOI: https://doi.org/10.22364/mkm.58.4.04.
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Turbin, N.V., Trifonov, R.D. & Kovtunov, S.S. Simulation of Crumpling in Composite Materials via Computational Micromechanics. Mech Compos Mater 58, 499–512 (2022). https://doi.org/10.1007/s11029-022-10045-y
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DOI: https://doi.org/10.1007/s11029-022-10045-y