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RESEARCH PAPERS

Effect of Material Anisotropy and Curing Stresses on Interface Delamination Propagation Characteristics in Multiply Laminated FRP Composites

[+] Author and Article Information
Brajabandhu Pradhan1

Mechanical Engineering Department, Indian Institute of Technology, Kharagpur-721302, West Bengal, Indiabpradhan@mech.iitkgp.ernet.in

Saroja Kanta Panda

Mechanical Engineering Department, Indian Institute of Technology, Kharagpur-721302, West Bengal, India

1

Corresponding author.

J. Eng. Mater. Technol 128(3), 383-392 (Dec 30, 2005) (10 pages) doi:10.1115/1.2203100 History: Received May 04, 2005; Revised December 30, 2005

The present study encompasses the thermoelastic effect of material anisotropy and curing stresses on interlaminar embedded elliptical delamination fracture characteristics in multiply laminated fiber-reinforced polymeric (FRP) composites. Two sets of full three-dimensional finite element analyses have been performed to calculate the displacements and interlaminar stresses along the delaminated interface responsible for the delamination onset and propagation. Modified crack closure integral methods based on the concepts of linear elastic fracture mechanics have been followed to evaluate the individual modes of strain energy release rates along the delamination front. It is shown that the individual modes of energy release rates vary along the delamination front depending on the ply sequence, orientation, and thermoelastic material anisotropy of the constituting laminae. This causes the anisotropic and non-self similar delamination propagation along the interface. The asymmetric and nonuniform variations in the nature of energy release rate plots obtained in a thermomechanical loading environment are significant when curing stress effects are included in the numerical analysis and hence should be taken into account in the designs of laminated FRP composite structures.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Illustration of geometry of laminate specimen containing an interfacial elliptical delamination

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Figure 2

(a) Embedded curved delamination front propagation and (b) one-quarter of the elliptical delamination front propagation

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Figure 3

Schematic of global and local coordinates along the delamination front

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Figure 4

Template of mesh in the plane of elliptical delamination

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Figure 5

Zoomed section view of meshing pattern of plane of elliptical delamination

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Figure 6

Typical FE meshing of the sublaminate

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Figure 7

Three-dimensional FE model of the FRP composite laminate specimen

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Figure 8

Comparison of GII distribution at different angles along the interfacial elliptical delamination front for [0m∕90m]T glass/epoxy laminate

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Figure 9

Comparison of GIII distribution at different angles along the interfacial elliptical delamination front for [0m∕90m]T glass/epoxy laminate

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Figure 10

Comparison of GII distribution at different angles along the interfacial elliptical delamination front for [0m∕90m]T boron/epoxy laminate

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Figure 11

Comparison of GIII distribution at different angles along the interfacial elliptical delamination front for [0m∕90m]T boron/epoxy laminate

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Figure 12

Distribution of G around an embedded elliptical delamination for different FRP composite materials subjected to mechanical loading only without considering curing stress effects

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Figure 13

Distribution of G around an embedded elliptical delamination for different FRP composite materials subjected to a sequential thermo-mechanical loading with consideration of curing stress effects

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Figure 14

Comparison of strain energy release rate Gmax for several angle-ply [θm∕−θm]T graphite/epoxy composite laminates with an embedded interlaminar elliptical delamination

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