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Appl. Sci. 2017, 7(1), 93; doi:10.3390/app7010093

Evaluation of Interlaminar Stresses in Composite Laminates with a Bolt-Filled Hole Using a Linear Elastic Traction-Separation Description

School of Aeronautics, Northwestern Polytechnical University, P.O. Box 120, Xi’an 710072, Shaanxi Province, China
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Academic Editor: Peter Van Puyvelde
Received: 6 December 2016 / Revised: 14 January 2017 / Accepted: 16 January 2017 / Published: 18 January 2017
(This article belongs to the Section Materials)
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Abstract

Determination of the local interlaminar stress distribution in a laminate with a bolt-filled hole is helpful for optimal bolted joint design, due to the three-dimensional (3D) nature of the stress field near the bolt hole. A new interlaminar stress distribution phenomenon induced by the bolt-head and clamp-up load, which occurs in a filled-hole composite laminate, is investigated. In order to efficiently evaluate interlaminar stresses under the complex boundary condition, a calculation strategy that using zero-thickness cohesive interface element is presented and validated. The interface element is based on a linear elastic traction-separation description. It is found that the interlaminar stress concentrations occur at the hole edge, as well as the interior of the laminate near the periphery of the bolt head. In addition, the interlaminar stresses near the periphery of the bolt head increased with an increase in the clamp-up load, and the interlaminar normal and shear stresses are not at the same circular position. Therefore, the clamp-up load cannot improve the interlaminar stress distribution in the laminate near the periphery of the bolt head, although it can reduce the magnitude of the interlaminar shear stress at the hole edge. Thus, the interlaminar stress distribution phenomena may lead to delamination initiation in the laminate near the periphery of the bolt head, and should be considered in composite bolted joint design. View Full-Text
Keywords: interlaminar stresses; filled-hole compression testing; traction-separation laws; bolted joints; cohesive element interlaminar stresses; filled-hole compression testing; traction-separation laws; bolted joints; cohesive element
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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. (CC BY 4.0).

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MDPI and ACS Style

Cao, Y.; Feng, Y.; Xue, X.; Wang, W.; Bai, L. Evaluation of Interlaminar Stresses in Composite Laminates with a Bolt-Filled Hole Using a Linear Elastic Traction-Separation Description. Appl. Sci. 2017, 7, 93.

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