Effect of High Velocity Deformation on Strength of ArmoredComposite Materials

Trah Quyet Thang, Et Al

doi:10.17762/turcomat.v12i2.2296

Abstract

This paper considers the problem of determining the strength of carbon fiber reinforced plastic with straight and curved fibers under high-speed loading. High-speed tests of unidirectional CFRP specimens with rectilinear and wavy structure have been carried out. The influence of the structure and high-speed loading on the ultimate strength and ultimate deformation of the material is investigated. For the first time, a detailed study of the effect of fiber curvature on the properties of CFRP under high-speed deformation has been carried out. As a result of dynamic tests, it was shown that the ultimate strength in unidirectional laying is higher than in wavy laying. The effect of increasing the ultimate deformations of specimens with bent fibers was established, which was noted earlier for the case of tensile tests.

Highlights

During loading, a material subjected to high-rate deformation may change its mechanical properties, in comparison with the properties found as a result of static tests[1-8]
The order of the realized rates of deformations in the problems under consideration can be estimated from simple ratios: in a time of 0,001 – 0,005 sec, deformations close to the limiting ones can develop in the product, that is, no more than 1-2% for a standard material such as epoxy carbon fiber
Figure: 2. Diagrams of impulses versus strain rate and stress-strain diagrams obtained during dynamic compression test of specimens with wavy packing

Summary

Effect of High Velocity Deformation on Strength of ArmoredComposite Materials

Article History: Received: 11 January 2021; Accepted: 27 February 2021; Published online: 5 April 2021 Abstract:This paper considers the problem of determining the strength of carbon fiber reinforced plastic with straight and curved fibers under high-speed loading. High-speed tests of unidirectional CFRP specimens with rectilinear and wavy structure have been carried out. The influence of the structure and high-speed loading on the ultimate strength and ultimate deformation of the material is investigated. A detailed study of the effect of fiber curvature on the properties of CFRP under high-speed deformation has been carried out. As a result of dynamic tests, it was shown that the ultimate strength in unidirectional laying is higher than in wavy laying. The effect of increasing the ultimate deformations of specimens with bent fibers was established, which was noted earlier for the case of tensile tests.

Introduction

Findings

Conclusions