Finite Element Analysis of the Parameters Influencing the Failure Modes of Carbon Fiber Reinforced Polymer Cores

Jiayun Cao,Hongbo Chen,Yu Jiang,Xiaomin Zhang

doi:10.1109/access.2021.3085132

Jiayun Cao, Hongbo Chen + Show 2 more

Open Access

https://doi.org/10.1109/access.2021.3085132

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Abstract

Carbon fiber reinforced polymer (CFRP) is an anisotropic material with outstanding tensile strength in the axial direction but low compressive strength in the radial direction. In the process of line construction, such as wire crimping and conductor clamping, radial pressure failure and slip failure easily occur. This paper applies finite element analysis (FEA) to the parameters influencing the radial stress and displacement in a CFRP core to research the failure modes of the CFRP core. The selected parameters are the interference of the CFRP core, the friction coefficient between the core and inner wedge, and the angle of the inner wedge. The finite element method is applied to analyze a CFRP core with a self-tightening clamp to find the optimum condition parameters so that the CFRP core experiences neither slip failure nor radial pressure failure. From the study, lower interference and larger friction coefficient and angle lead to lower radial stress. The interference has the largest effect on the mitigation of radial pressure failure. For larger interference, a larger friction coefficient and angle mitigate slip failure. According to the analytic results, an interference between 0.02 mm and 0.025 mm and an angle larger than 3°, coupled with a friction coefficient larger than 0.3, best stop slip failure and radial pressure failure.

Highlights

As carriers of electric power, overhead conductors play an important role in transmission lines [1]–[3]
This paper presents a study on the slip failure and radial pressure failure characteristics of a Carbon fiber reinforced polymer (CFRP) core with a self-tightening strain clamp in order to manufacture the optimal self-tightening clamp
For a friction coefficient of 0.2 and an inner wedge with an angle of 3.5◦, the minimum radial stress reaches 95.79 MPa, corresponding to a reduction of approximately 8.5% compared to the maximum radial stress. This is a small change in the radial stress. This shows that the angle and the friction coefficient have little effect on the radial stress compared to the interference.When the Angle is 3.5◦, the minimum radial stress of the CFRP core is 95.79MPa, which does not exceed the compressive strength of the CFRP core of 100 MPa, and the radial pressure failure will not occur at this time

Summary

INTRODUCTION

As carriers of electric power, overhead conductors play an important role in transmission lines [1]–[3]. There is a confining force between the core and the inner wedge from the self-tightening clamp. This confining force is a friction force that occurs in the direction parallel to the contact surface and varies with respect to the radial clamping force and friction coefficient. Slip failure may occur because of a decrease in the radial force necessary for the self-tightening clamp due to interference. The major factors affecting the failure mechanism of the self-tightening strain clamp are the friction coefficient between the CFRP core and the inner wedge and the interference between the core and the inner wedge. FINITE ELEMENT MODEL The model considered in the analysis is composed of the CFRP core, the inner wedge, and the wedge holder (Figure 1). Static analysis simulations are carried out to obtain the displacement and radial stress results with the Lagrangian approach to reduce the computational time

FAILURE CRITERION FOR CFRP CORE

RESULTS AND DISCUSSION

CONCLUSION