文档介绍：Available online at ernational
Journalof
International Journal of Fatigue 30 (2008) 483–492 Fatigue
ate/ijfatigue
Damage tolerance and durability of selectively stitched
posite structures
Yi Tan a, Guocai Wu a,b,*, Sung S. Suh a, Jenn Ming Yang a, H. Thomas Hahn c
a Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, United States
b Cummins Inc. Columbus, Indiana, 47201, United States
c Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, CA 90095, United States
Received 8 September 2006; received in revised form 19 April 2007; accepted 22 April 2007
Available online 10 May 2007
Abstract
Through-the-thickness stitching is one of the promising approaches to improve the impact damage tolerance of posite
structures. In this research, the effect of selective stitching on impact damage tolerance and fatigue durability of posite pan-
els was extensively investigated pared with unstitched posite panels. Two-blade posite panels were
fabricated by resin film infiltration technique. Impact damage was inflicted on the stiffened panels using a drop-weight with the impact
energy of 30 J from the skin-side over the stiffener and the flange. The experimental results indicate that selective stitching is an effective
way to improve pressive failure strength and fatigue strength of stiffened