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RESEARCH PAPERS

Analysis and Testing of Mixed-Mode Interlaminar Fracture Behavior of Glass-Cloth∕Epoxy Laminates at Cryogenic Temperatures

[+] Author and Article Information
Yasuhide Shindo

Department of Materials Processing, Graduate School of Engineering,  Tohoku University, Aoba-yama 6-6-02, Sendai 980-8579, Japanshindo@material.tohoku.ac.jp

Daiki Shinohe

 Dai Nippon Printing Co., Ltd, 2nd SPI Propulsion Dept., Integrated Manufacturing Technology Laboratory, Technology Development Center, Midorigahara 1-1-3, Tsukuba 300-2646, Japan

Susumu Kumagai, Katsumi Horiguchi

Department of Materials Processing, Graduate School of Engineering,  Tohoku University, Aoba-yama 6-6-02, Sendai 980-8579, Japan

J. Eng. Mater. Technol 127(4), 468-475 (Jun 02, 2005) (8 pages) doi:10.1115/1.2019944 History: Received September 02, 2003; Revised May 23, 2005; Accepted June 02, 2005

This paper presents results from an analytical and experimental study of the effect of temperature and mixed-mode ratio on the interlaminar fracture toughness in glass-cloth∕epoxy laminates. Mode I, mode II, and mixed-mode tests were conducted by the double-cantilever beam, end-notched flexure, and mixed-mode bending test methods at room temperature, liquid nitrogen temperature (77 K), and liquid helium temperature (4 K). A finite element model was used to perform the delamination crack analysis. Mode I, mode II, and mixed-mode energy release rates at the onset of delamination crack propagation were computed using the virtual crack closure technique. The fracture surfaces were examined by scanning electron microscopy to correlate with the interlaminar fracture properties.

Copyright © 2005 by American Society of Mechanical Engineers
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References

Figures

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Figure 4

Boundary conditions assumed for finite element calculations (MMB test)

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Figure 5

Relationships between (BC)1∕3 and a∕2H at room temperature (RT)

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Figure 6

Relationships between (BC)1∕3 and a∕2H at 77 K

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Figure 7

Typical load-displacement curves from DCB, MMB, and ENF tests at room temperature

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Figure 8

Typical load-displacement curves from DCB, MMB, and ENF tests at 77 K

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Figure 9

Typical load-displacement curves from DCB, MMB, and ENF tests at 4 K

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Figure 10

Critical total strain energy release rate as a function of mixed mode ratio

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Figure 20

SEM photograph of fracture surface of ENF specimen at 77 K (crack growth from left to right)

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Figure 1

DCB test configuration

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Figure 2

MMB test configuration

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Figure 3

ENF test configuration

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Figure 11

Distribution of strain energy release rate along the delamination front of a DCB specimen at 4 K

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Figure 12

Distributions of strain energy release rates along the delamination front of an ENF specimen at 4 K

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Figure 13

Distributions of strain energy release rates along the delamination front of a MMB specimen with c∕L=1.008 at 4 K

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Figure 14

Distributions of strain energy release rates along the delamination front of a MMB specimen with c∕L=0.5 at 4 K

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Figure 15

SEM photograph of fracture surface of DCB specimen at 4 K (crack growth from left to right)

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Figure 16

SEM photograph of fracture surface of MMB specimen with c∕L=1.008 at 4 K (crack growth from left to right)

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Figure 17

SEM photograph of fracture surface of MMB specimen with c∕L=0.76 at 4 K (crack growth from left to right)

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Figure 18

SEM photograph of fracture surface of MMB specimen with c∕L=0.5 at 4 K (crack growth from left to right)

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Figure 19

SEM photograph of fracture surface of ENF specimen at 4 K (crack growth from left to right)

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