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International Journal of Polymer Science
Volume 2017, Article ID 2790198, 11 pages
https://doi.org/10.1155/2017/2790198
Research Article

Effects of Hole Perpendicularity Error on Mechanical Performance of Single-Lap Double-Bolt Composite Joints

1School of Automotive Engineering, Dalian University of Technology, Dalian 116024, China
2School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China

Correspondence should be addressed to Xueshu Liu; nc.ude.tuld@sxuil

Received 9 August 2017; Revised 10 October 2017; Accepted 7 November 2017; Published 27 November 2017

Academic Editor: Peng He

Copyright © 2017 Xueshu Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Static tensile experiments and numerical simulations were carried out to study effects of hole perpendicularity error on mechanical performance of single-lap double-bolt composite joints. Hole tilting angle, varying from 1 to 4 degrees, and hole tilting direction to account for anisotropic properties of composite material were investigated. Progressive damage model (PDM) based on Chang-Lessard type criterion with an extension by Olmedo was created, which involved seven failure modes and made material properties be a direct function of predefined field variables. The model was implemented in ABAQUS/Standard using a UMAT subroutine. Good agreement was found when comparing numerical simulation results with experimental outcomes. In addition, the results demonstrate that, with increasing of hole tilting angle, damage is prone to arise and the load path of the composite bolted joints alters with changing of hole tilting direction, which result in severe stress concentration around the edge of hole and joint failure in advance.