Deformation and failure of carbon fiber composite specimens with embedded defects during tension-torsion test

Tatyana Viсtorovna Tretyakova,Valery E. Wildemann,Mikhail P. Tretyakov,Elena M. Strungar

doi:10.3221/igf-esis.46.27

Tatyana Viсtorovna Tretyakova, Valery E. Wildemann + Show 2 more

Open Access

https://doi.org/10.3221/igf-esis.46.27

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Abstract

A need to timely reveal operational damages and technological defects requires a prompt control of states of structures made from composite materials and their consequent repairs aimed at service life extension. This work is devoted to the experimental study of inelastic deformation and fracture of specimens made from layer composite materials with prior introduced technological defects related to a possible inappropriate compacting and inappropriate bonding of material layers at a given restricted domain. The analysis is carried on the evolution of inhomogeneous deformation fields on the surface of carbon plastic specimens with an internal “delamination-type” defect under complex stress state. The method of active infrared thermography was used to identify the location and parameters of defects configurations. The obtained experimental data will be used for further tests related to sufficiency evaluation of signals received from the built-in sensors under complex loadings.

Highlights

Layer composite materials are widely used to manufacture products for aviation and structural elements using woven prepregs with different technologies
A need to timely reveal operational damages and technological defects requires a prompt control of states of structures and their consequent repairs aimed at service life extension [4,5,6,7,8,9,10]
The use of embedded optical fibers with Bragg gratings for the analysis of mechanical behaviour and evaluation of material damage is of interest at this time in the field of monitoring the state of structural elements made from composite materials [11,12,13,14,15,16,17]

Summary

Introduction

Layer composite materials are widely used to manufacture products for aviation and structural elements using woven prepregs with different technologies. The methods were developed which aim at mechanical testing of composite specimens with prior introduced technological defects with a joint use of monitoring systems of inhomogeneous deformation fields and temperatures to detect damages with advanced technologies and methods of diagnostics [19,20,21,22,23,24].

Results

Conclusion