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Stress and Failure Analysis of Repaired Sandwich Composite Beams Using a Cohesive Damage Model

Department of Mechanical Engineering and Industrial Management, Faculty of Engineering, University of Porto, Porto, Portugal

^* To whom correspondence should be addressed. E-mail: dem06002{at}fe.up.pt.

	Abstract

The behavior of a repaired sandwich beam subjected to four-point bending is investigated numerically using the ABAQUS® software and specially developed interface elements including a cohesive mixed-mode damage model based on the indirect use of fracture mechanics. The two major repair configurations for sandwich structures, namely overlap and scarf repair, are studied. The interface elements, placed at the middle of the adhesive, parent laminate/adhesive and adhesive/patch interfaces, allow to obtain stress distributions at these locations as well as to simulate damage onset and growth. The influence of several geometrical parameters, such as overlap length and patch thickness for overlap repairs, and scarf angle for scarf repairs, is evaluated in terms of stress analysis and strength predictions. Conclusions were drawn about design guidelines of the sandwich composite repair.

First published on June 24, 2009
Journal of Sandwich Structures and Materials 2009, doi:10.1177/1099636209104520


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