Tensile strength prediction of orthogonal CFRP under high intensity CW laser irradiation

Jiawei Wang,Guobin Feng,Chenghua Wei,Yongxiang Zhu,Lijun Wang,Zhiliang Ma,Yuwei Lv

doi:10.1063/1.5111548

Jiawei Wang, Guobin Feng + Show 5 more

Open Access

https://doi.org/10.1063/1.5111548

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Journal: AIP Advances	Publication Date: Oct 1, 2019
Citations: 3	License type: cc-by

Affiliation: Northwest Institute of Nuclear Technology

Abstract

Considering the two most important factors, delamination and tensile strength temperature dependence, a tensile strength prediction model for orthogonal carbon fiber reinforced polymer (CFRP) under continuous wave (CW) laser irradiation is proposed. In the prediction model, delamination was judged by the thermal data recorded by a thermal imager. In order to eliminate the influence of heating rate on the tensile strength temperature dependence parameters, a two-sided laser irradiation method was proposed to test the tensile strength temperature dependence of CFRP. Furthermore, according to the temperature distribution in the thickness direction of the T700/E44 CFRP specimen and the tensile strength temperature dependence, the tensile strength for orthogonal CFRP under CW laser irradiation was calculated. The results show that the prediction model can reflect the decreasing process of tensile strength with laser irradiation, especially in the cases of high intensity laser irradiation and high tensile load. This research can make a reference for the tensile strength prediction of composite materials in high intensity CW laser irradiation and pre-tension loading conditions.

Highlights

Carbon fiber reinforced polymer (CFRP) is one of the most important composite materials that are widely used in aerospace, spaceflight and marine
In order to predict the tensile strength of orthogonal CFRP, determining the tensile strength distribution of carbon fibers and calculating the stress concentrations around the fiber breaks were needed
In order to eliminate the influence of heating rate, a twosided laser irradiation method was proposed to test the tensile strength temperature dependence parameters of CFRP

Summary

INTRODUCTION

Carbon fiber reinforced polymer (CFRP) is one of the most important composite materials that are widely used in aerospace, spaceflight and marine. The tensile strength of this composite material has attracted much attention over periods of decades. Yamamoto used a spring element model that considers the surface stress concentration on fibers caused by a fracture site in an adjacent fiber to predict the tensile strength of CFRP. With the wide application of laser processing, researchers began to study the effect of continuous laser irradiation on the tensile strength of CFRP based on these theories It shows that delamination caused by thermal stress in adjacent fibers is one of the most important reasons for the tensile strength degradation under continuous wave (CW) laser irradiation. Based on the experimental results, an empirical model was proposed to predict the post-heating bond stress-slip relationship between the CFRP bar and the surrounding concrete. Based on the results of the previous studies, a prediction model of tensile strength for CFRP under laser irradiation is proposed. The model takes the two important factors, delamination and tensile strength temperature dependence, into consideration

TENSILE STRENGTH PREDICTION MODEL

TENSILE STRENGTH TEMPERATURE DEPENDENCE TEST

TENSILE FRACTURE EXPERIMENT UNDER LASER IRRADIATION

RESULTS AND DISCUSSION

CONCLUSION