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Failure Analysis of Thick Composite Flexural Plates Constrained by Bolt Joints

Title:

Failure Analysis of Thick Composite Flexural Plates Constrained by Bolt Joints

Gorjipoor, Alireza (2018) Failure Analysis of Thick Composite Flexural Plates Constrained by Bolt Joints. PhD thesis, Concordia University.

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Abstract

This research study introduces a numerical model to predict failure in thick glass/epoxy laminated beams subjected to flexural bending moment and bolt joint loads. The accuracy of the proposed model was verified by experiments using strain gages and Digital Image Correlation (DIC) methods. During last decades, aluminum and steel have been substituted by composite materials specially in the aerospace industry where higher specific strength and stiffness are the main criteria for material selection. The yoke of the helicopter is one of the recent applications of thick composite structures. The yoke connects the main rotor blade to the hub using bolt joints and it is manufactured as a thick glass/epoxy beam. Performing the experimental tests during the design process of the yoke is highly expensive and time-consuming.
In this study, a numerical model is introduced to perform stress and failure analysis for a simplified model of the yoke. This simplified model consists of a thick composite laminate subjected to flexural bending moment and bolt joint connections. At first, a finite element model was developed to predict the structural behavior of the beam in the presence of flexural bending which is the main load in the real application. In the next step, Progressive damage modeling was added to the stress analysis code, to provide a package for failure prediction for this case study.
This model can be utilized in the design process of the yoke to reduce the number of the required iterative experiments. The results showed the agreement between strain distribution obtained from the finite element model and the experimental results from strain gages and Digital Image Correlation (DIC). Also, a good correlation was observed between experimental tests and failure prediction performed through simulation. The results of failure analysis showed a good agreement with the experimental tests about the final failure load level, crack position on the surface, pattern of failure propagation inside the plate and dominant failure mode. In addition, the failure analysis will provide information about the failure initiation load level and the position of the first failed elements inside the plate.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Mechanical and Industrial Engineering
Concordia University > Gina Cody School of Engineering and Computer Science > Mechanical, Industrial and Aerospace Engineering
Item Type:Thesis (PhD)
Authors:Gorjipoor, Alireza
Institution:Concordia University
Degree Name:Ph. D.
Program:Mechanical Engineering
Date:31 March 2018
Thesis Supervisor(s):Hoa, Suong Van and Ganesan, Rajamohan
ID Code:984058
Deposited By: ALIREZA GORJIPOOR
Deposited On:31 Oct 2018 17:18
Last Modified:31 Oct 2018 17:18

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