CUED Publications database

Biomimetic-inspired composite to metal single lap joints

Avgoulas, EI and Sutcliffe, MPF (2014) Biomimetic-inspired composite to metal single lap joints. In: UNSPECIFIED.

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Joining composites with metal parts leads, inevitably, to high stress concentrations because of the material property mismatch. Since joining composite to metal is required in many high performance structures, there is a need to develop a new multifunctional approach to meet this challenge. This paper uses the biomimetics approach to help develop solutions to this problem. Nature has found many ingenious ways of joining dissimilar materials and making robust attachments, alleviating potential stress concentrations. One of the key characteristics that nature uses to joint dissimilar materials is a transitional zone of stiffness in the insertion site. Several biomimetic-inspired metal-to-composite (steel-to-CFRP), adhesively bonded, Single Lap Joints (SLJs) were numerically investigated using a finite element analysis. The proposed solutions offer a transitional zone of stiffness of one joint part to reduce the material stiffness mismatch at the joint. An optimisation procedure was used to identify the variation in material stiffness which minimises potential failure of the joint. It was found that the proposed biomimetic SLJs reduce the asymmetry of the stress distribution along the adhesive area, giving a 59% shear stress reduction in some configurations.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div C > Materials Engineering
Div C > Biomechanics
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:33
Last Modified: 07 Aug 2018 03:41