Compression Shear Properties of Adhesively Bonded Single-Lap Joints of C/C Composite Materials at High Temperatures

Yanfeng Zhang,Zhengong Zhou,Zhiyong Tan

doi:10.3390/sym11121437

Yanfeng Zhang, Zhengong Zhou + Show 1 more

Open Access

https://doi.org/10.3390/sym11121437

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Abstract

The performance of joint structure is an important aspect of composite material design. In this study, we examined the compression shear bearing capacity of the adhesively bonded single-lap joint structure of high-temperature-resistant composite materials (C/C composite materials). The test pieces were produced in accordance with the appropriate ASTM C1292 standard, which were used for the compression shear test. The failure morphology of the layer was observed by a digital microscopic system and scanning electron microscope. The experimental result shows that the load on the test piece increased nonlinearly until the failure occurred, and most of the adhesive layer exhibited cohesive failures at three temperature points (400, 600, and 800 °C), while the interface failures occurred in a small part of the adhesive layer. A numerical analysis model was established using ABAQUS finite element software. The simulation results were compared with the test results to verify the correctness of the model. On the basis of correctness of the model verified by comparing the simulation results and the test results, the influences of temperature and overlapped length on the joint compression shear performance were studied through the validated simulation method. Numerical results showed that the ultimate load of the joint decreased with increases in temperature and that the distribution trends of the shear stresses in the overlapped length direction were substantially the same for joints of different overlapped lengths.

Highlights

The connection of composite parts is an important aspect in various fields ranging from materials to engineering structures [1]
With support from the National Natural Science Foundation of China, we studied the compression shear properties of the adhesively bonded single-lap structures of high-temperature-resistant composite materials (C/C composite materials) at high temperatures by combining experimental tests and finite element simulations
At the initial stage of loading, no obvious sound was heard from the test piece, but the two plates suddenly separated when the load reached the breaking load, accompanied by an obvious cracking sound

Summary

Introduction

The connection of composite parts is an important aspect in various fields ranging from materials to engineering structures [1]. Compared with traditional mechanical connections, the use of adhesive bonding technology for composite materials avoids the damage and stress [2] caused by punching on the components, and enhances the integrity of the materials. Adhesive bonding technology enables the strength of the structure to be equal to or higher than that of traditional connections, which saves costs and reduces the weight of the bond. The structure of the adhesively bonded joint is simple, with good sealing performance, high specific strength, and low cost. It is widely used in the aerospace, mechanical manufacturing, and automobile fields [3,4].

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