Numerical-experimental study of the strength of constructional elements, made of carbon laminate

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Abstract

Experimental results on the strength of CFRP laminate samples with stress concentrators of cylindrical hole- and counterformed hole-type are presented. Photographs of the samples after testing either with stress concentrators or smooth specimen with typical laminate stacking are showed. The rate of the strength reduction, obtained by means of experiments, and depending on the concentrators’; type and the material of a sample, is presented in a tabular form. Along with the experiment, a numerical evaluation of the samples’; strength with the usage of a gradient criterion (the case of compression) and Nuizmer criterion for stress in a point (the case of stretching) is conducted. Similarly, the rate of the strength reduction, obtained with the usage of criteria, are presented in a tabular form. Based on the comparison of the results obtained by numerical and experimental way, the parameters of the Nuizmer criterion corresponding to the experimental samples’; rupture stresses are offered. Guidance on the application of the considered criteria of the strength assessment to the layered composites under examination, depending on the type of stress concentrator is provided.

About the authors

N. A. Kovalenko

Email: natasha_kovalenko@ngs.ru
Post-graduate Student, Engineer, Novosibirsk State Technical University, Siberian Aeronautical Research Institute named after S.A. Chaplygin, e-mail: natasha_kovalenko@ngs.ru

I. P. Olegin

D.Sc. (Engineering), Professor, Novosibirsk State Technical University

T. B. Gotseluk

Ph.D. (Engineering), Associate Professor, Head of Sector, Novosibirsk State Technical University, Siberian Aeronautical Research Institute named after S.A. Chaplygin

V. N. Chaplygin

Head of Department, Siberian Aeronautical Research Institute named after S.A. Chaplygin

P. M. Petrov

Mechanic, Siberian Aeronautical Research Institute named after S.A. Chaplygin

References

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