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TECHNICAL PAPERS

Effect of Bond Thickness on the Fracture Toughness of Adhesive Joints

[+] Author and Article Information
Deok-Bo Lee

The BK21 Division for Research and Education in Mechanical Engineering, Hangyang University, 17 Haengdang-dong, Sungdong-ku, Seoul 133-791, Korea

Toru Ikeda, Noriyuki Miyazaki

Department of Chemical Engineering, Graduate School of Engineering, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan

Nak-Sam Choi

Department of Mechanical Engineering, Hanyang University, 1271 Sa-1 dong, Ansan-si, Kyunggi-do 425-791, Korea

J. Eng. Mater. Technol 126(1), 14-18 (Jan 22, 2004) (5 pages) doi:10.1115/1.1631433 History: Received December 31, 2002; Revised September 03, 2003; Online January 22, 2004
Copyright © 2004 by ASME
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Figures

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Two typical types of bond-thickness effects on the fracture toughness of adhesive joints
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Compact tension (CT) specimen of an adhesive joint (W=48 mm,a/W≈0.5)
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Compact tension (CT) specimen of bulk epoxy resin (W=24 mm,a/W≈0.5,thickness=8 mm)
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Load-displacement relationship of specimens: (a) adhesive joints; and (b) bulk adhesive.
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Fracture energy of adhesive joints and bulk adhesive (Each point indicates the average of 10 measurements)
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Morphology of the rubber-modified epoxy resin around pre-cracks and along the adhesive-adherend interfaces in virgin specimens: (a) in an adhesive layer with a thickness of 1.5 mm; (b) in an adhesive layer with a thickness of 0.3 mm; and (c) in an adhesive layer with a thickness of 0.1 mm.
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Schematic pattern of the distribution of rubber particles in an adhesive layer between aluminum adherends
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Damage of the rubber modified epoxy resin around pre-cracks and along the adhesive-adherend interfaces in damaged specimens: (a) in an adhesive layer with a thickness of 2.1 mm; (b) in an adhesive layer with a thickness of 1.5 mm; (c) in an adhesive layer with a thickness of 0.7 mm; (d) in an adhesive layer with a thickness of 0.3 mm; and (e) in an adhesive layer with a thickness of 0.1 mm.

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