Research Papers

Experimental Study of Mode II Fracture of Hybrid Composite and Metal-Wire Joints

[+] Author and Article Information
Y. W. Kwon1

Department of Mechanical and Astronautical Engineering, Naval Postgraduate School, Monterey, CA 93943

W. A. Schultz

Department of Mechanical and Astronautical Engineering, Naval Postgraduate School, Monterey, CA 93943

D. C. Loup, E. A. Rasmussen

Structures and Composite Division, Naval Surface Warfare Center, Bethesda, MD 20817


Corresponding author.

J. Pressure Vessel Technol 133(2), 021003 (Feb 09, 2011) (6 pages) doi:10.1115/1.4002677 History: Received December 07, 2008; Revised July 02, 2009; Published February 09, 2011; Online February 09, 2011

In order to join a composite structure to a metallic structure, metal-wire mats were co-cured with composite laminas using the vacuum assisted resin transfer molding technique. Then, interface fracture toughness was measured for Mode II fracture for various lay-up and interface conditions. The study included interfaces of metal-wire to composite, composite to composite, and metal-wire to metal-wire. In addition, the lay-up orientations of metal-wire mats were varied between 0 deg and 90 deg. This study also examined the crack propagation from a composite to a metal/composite interface. During the test, the digital image correlation technique was applied to capture the strain field around the crack tip. The results suggested that a hybrid metal-wire/composite laminate would be effective to connect a composite structure to a metallic structure as long as some critical interface conditions were avoided.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

Basic transition joint

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Figure 2

E-glass woven roving

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Figure 3

SX Metal-wire mat

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Figure 4

Summary of 12 cases (continued). The light gray indicates a composite layer, dark gray denotes a metal-wire layer, dots inside the metal-wire layer represent the 90 deg orientation, and black is the plastic backing of the metal-wire layer. The white line indicates the interface crack. The actual thickness of the plastic backing is so small and negligible even though it is shown in the figure to indicate its position relative to other layers.

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Figure 5

Three-point bending test for the shear mode fracture

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Figure 6

Summary of critical energy release for different interface cracks

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Figure 7

Typical failure with crack initiation and propagation through interface

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Figure 8

Crack propagation moved from the interface between two metal-wire layers to the interface between metal-wire and E-glass layers by going through between 90 deg metal-wire bundles

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Figure 9

Crack propagation followed by bending failure: (a) before and (b) after the bending failure

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Figure 10

Typical failure and crack Initiation

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Figure 11

Comparison of fracture toughness for Cases 1 and 4




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