Strength criterion for unidirectional CFRP under off-axis loading

Alexander Dumansky,Mukhamiat Alimov,Hao Liu,A Glezer,S Roshchupkin

doi:10.1051/matecconf/202032903048

Alexander Dumansky, Mukhamiat Alimov + Show 3 more

Open Access

https://doi.org/10.1051/matecconf/202032903048

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Abstract

A failure criterion is proposed which allows describing the strength of unidirectional CFRP under tension-compression at an off-axis angle with strength applicable for practical use. An experimental verification was carried out which showed satisfactory agreement with the experimental results. The criterion makes it possible to determine the peak of the failure envelope in the compression area caused, on the one hand, by an increase in strength under in-plane shear due to transverse compressive stresses and, on the other hand, by a decrease in strength due to destruction of the matrix and the interface between unidirectional layer components.

Highlights

Most of the works devoted to the development of models of mechanical behavior are based on the unidirectional layer properties [1,2,3]
There has been an increase in the number of publications related to the study of the effect of strain rate and other experiments showing the rheological properties of unidirectional composites [4]
The parameters of the curve were determined by the least squares method as well as by using the control points of the parabola

Summary

Introduction

Most of the works devoted to the development of models of mechanical behavior are based on the unidirectional layer properties [1,2,3]. Criteria of the tensor polynomial form in which the main difficulty is the determination of the coefficients of mutual influence of components are considered interactive. As a rule, these components include the values of normal stresses while the relationship between normal and shear stresses is not considered. The effect of mutual influence of normal and shear stresses as an experimental fact, along with other features, was noted in a number of works [4, 5, 714]. It is assumed that when the extremum is passed, a change in the type of fracture is observed

Tensor polynomial criteria

Model description

Conclusion

Failure Criteria in Fibre Reinforced Polymer Composites