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Journal of Sandwich Structures and Materials
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Article

Evaluation of new crack suppression method for foam core sandwich panel via fracture toughness tests and analyses under mode-i type loading

Yasuo Hirose1*, Hirokazu Matsuda2, Go Matsubara2, Fumihide Inamura2, and Masaki Hojo

1 Commercial Aircraft Project Engineering Division, Aerospace Company Kawasaki Heavy Industries Ltd, Kakamigahara City, Japan
2 Strength Research Department, Technical Institute Kawasaki Heavy Industries Ltd, Akashi City, Japan

* To whom correspondence should be addressed. E-mail: hirose_yasuo{at}khi.co.jp..


  Abstract

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.

First published on June 24, 2009
Journal of Sandwich Structures and Materials 2009, doi:10.1177/1099636209104522
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