Multiscale Analysis on the Effect of Lap Length on Bonding Strength of Adhesively Bonding Structures of Plain Weave Composites

doi:10.3901/JME.2020.22.101

Abstract

Abstract: For plain weave composite laminates, the performance parameters of the meso-model are determined based on the homogenization method, followed by the analysis of the meso-model damage process using the Hashin criterion, and finally the continuum damage mechanics (CDM) and cohesive zone model (CZM) are introduced to establish the macro model of adhesively bonded structures of laminates. The research results show that the numerical curves of plain woven composite laminates are in good agreement with the test results, verifying the effectiveness of the multi-scale model. As the overlap length increases from 5 mm to 15 mm, the ultimate failure load of single lap joint (SLJ) and double lap joint (DLJ) gradually increases and tends to be stable, while the overlap shear strength gradually decreases. The failure mode of SLJ and DLJ transforms from the shear failure of the adhesive layer to the interlaminar delamination failure of lamintes with the increasing lap length gradually. In the case of the same overlap length, the ultimate failure load of the DLJ is larger than that of the SLJ. Based on the homogenization method, Hashin failure criterion, CDM and CZM, a multi-scale model of plain weave composite material is proposed, which is of great significance to the design of structural performance and service life.

Key words: multiscale, homogenization, adhesively bonded structure, lap length

CLC Number:

TB332

MA Xiaolong, LI Cheng, TIE Ying, HOU Yuliang, MAO Zhengang. Multiscale Analysis on the Effect of Lap Length on Bonding Strength of Adhesively Bonding Structures of Plain Weave Composites[J]. Journal of Mechanical Engineering, 2020, 56(22): 101-111.

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