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Journal of Sandwich Structures and Materials
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Evaluation of New Crack Suppression Method for Foam Core Sandwich Panel Via Fracture Toughness Tests and Analyses Under Mode-I Type Loading

Yasuo Hirose

Commercial Aircraft Project Engineering Division, Aerospace Company Kawasaki Heavy Industries, Ltd., 1 Kawasaki-cho, Kakamigahara City Gifu Pref. 504-8710, Japan, hirose_yasuo{at}khi.co.jp

Hirokazu Matsuda

Strength Research Department, Technical Institute Kawasaki Heavy Industries, Ltd., 1 Kawasaki-cho, Akashi City Hyogo Pref. 673-8666, Japan

GO Matsubara

Strength Research Department, Technical Institute Kawasaki Heavy Industries, Ltd., 1 Kawasaki-cho, Akashi City Hyogo Pref. 673-8666, Japan

Fumihide Inamura

Strength Research Department, Technical Institute Kawasaki Heavy Industries, Ltd., 1 Kawasaki-cho, Akashi City Hyogo Pref. 673-8666, Japan

Masaki Hojo

Department of Mechanical Engineering and Science, Kyoto University Sakyo-ku, Kyoto City, Kyoto Pref. 606-8501, Japan

A new crack arrester was proposed, in which a different material with higher stiffness is installed on the crack propagation path. The effect of this crack arrester was experimentally evaluated for interfacial crack propagation between a carbon fiber reinforced plastic surface skin and a foam core. The experimental results indicated that the crack arrester increased the critical load of the crack growth, and approximately five times larger apparent fracture toughness was obtained near the leading edge of the arrester by considering the energy release rate. It was also confirmed that the fabrication of the crack arrester had no detrimental effect on the intrinsic properties of the sandwich panel structures.

Key Words: foam core • sandwich panel • interfacial crack • crack suppression • mode I type loading.

Journal of Sandwich Structures and Materials, Vol. 11, No. 6, 451-470 (2009)
DOI: 10.1177/1099636208104522
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