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Author(s): Dimitra Ramantani
António Torres Marques
Marcelo Francisco Moura
Title: Modeling overlap and scarf repairs on sandwich composite structures
Issue Date: 2007
Abstract: It is well known that sandwich composite structures are easily damaged by low-velocity impact.Drastic reduction of the residual strength can occur, specifically under compression loads [1], [2].Consequently, it is necessary to develop repair methods so that costly components are not scrapped due toin-service damage.The two major repair configurations for sandwich structures namely overlap and scarf repair, arestudied. Using the ABAQUS software the behaviour of a repaired sandwich beam subjected to four pointbending is simulated considering two dimensional nonlinear material and geometrical analysis. Theobjectives of this work are to evaluate the stress distributions and the residual strength of the repairedbeam. The influence of several parameters like geometrical alterations on the patch and parent material,size and lay-up of the patch, type of adhesive and its thickness are evaluated in order to optimize therepair efficiency. A comparison between the two different repair methods is also performed in terms ofcharacteristics and advantages for each one, specifically about strength, efficiency and shear and peelstress distributions. Special developed interface finite elements including a cohesive mixed-mode damagemodel based on the indirect use of Fracture Mechanics[3], were incorporated in the ABAQUS softwareallowing to simulate damage initiation and growth , to evaluate the influence of the mechanical propertiesof the adhesive and interfaces on the joints strength, as well as to simulate the several types of fracture.Conclusions were drawn about design guidelines of the sandwich composite repair.
Source: The International Conference on Structural Analysis of Advanced Materials
Document Type: Artigo em Livro de Atas de Conferência Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Livro de Atas de Conferência Internacional

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