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Design of Pseudoductile Unidirectional Hybrid Composites Based on the Model of a Dry Bundle

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Mechanics of Composite Materials Aims and scope

An analytical method for designing layered high-modulus and high-strength fibrous hybrid composite materials with a highly nonlinear mechanical behavior is put forward. The elastic and strength characteristics of unidirectional layers of the composites were determined experimentally. Then, the parameters of Weibull distribution of the strength of carbon and glass fibers were estimated using test results for specimens of hybrid structure with a preliminary calculated number of carbon plastic layers in the composite. Using the criterion of maximum structural strength with a restricted elastic modulus and proportionality limit, the structure of a hybrid composite with thin CFRP and GFRP layers is optimized. A kinematic loading of a hybrid composite in which all layers deform together without stratification is considered. The Daniels model of dry bundle, with account of Weibull distribution of fiber strength, is employed to consider the decrease in the stiffness of composite layers and of the composite as a whole caused by microdefects. The approach offered was used in the design of a \( \left[{0}_m^{\mathrm{c}}/{0}_{1-m}^{\mathrm{g}}\right] \) pseudoductile hybrid carbon/glass plastic with the highest structural strength. It was found that m ≈ 0.30, which agreed with experimental data.

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Acknowledgements

This work was carried out at financial support of the Russian Science Foundation (project 18-19-00377). The test specimens were fabricated at the laboratory of composite materials of the Research Institute of Experimental Mechanical Engineering (Director R. A. Zakirov) of the South Ural State University.

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  1. South Ural State University, Chelyabinsk, Russia

    S. B. Sapozhnikov, A. V. Kheruvimov & A. V. Bezmel’nitsyn

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  1. S. B. Sapozhnikov
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  2. A. V. Kheruvimov
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  3. A. V. Bezmel’nitsyn
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Correspondence to S. B. Sapozhnikov.

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Translated from Mekhanika Kompozitnykh Materialov, Vol. 55, No. 2, pp. 331-344, March-April, 2019.

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Sapozhnikov, S.B., Kheruvimov, A.V. & Bezmel’nitsyn, A.V. Design of Pseudoductile Unidirectional Hybrid Composites Based on the Model of a Dry Bundle. Mech Compos Mater 55, 231–240 (2019). https://doi.org/10.1007/s11029-019-09806-z

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  • DOI: https://doi.org/10.1007/s11029-019-09806-z

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