Abstract

CAMPILHO, Raul D.S.G.; MOURA, Marcelo F.S.F. de; RAMANTANI, Dimitra A.  and  GONCALVES, João P.M.. Obtaining the cohesive laws of a trapezoidal mixed-mode damage model using an inverse method. C.Tecn. Mat. [online]. 2008, vol.20, n.1-2, pp.81-86. ISSN 0870-8312.

The use of cohesive damage models in fracture problems has become frequent in recent years. The objective of this work is to present a trapezoidal mixed-mode cohesive damage model appropriate for ductile adhesives in adhesively bonded joints. The proposed model replaces the solid finite elements traditionally used to simulate the adhesive layer, thus reducing the computational effort. It is known that the adhesive bulk properties are not adequate to characterize these laws. In this work, Double Cantilever Beam and End Notched Flexure tests are performed to obtain the cohesive laws of the adhesive Araldite^® 2015 in pure modes I and II, respectively. The fracture energies are obtained using a new data reduction scheme based on the crack equivalent concept. The remaining cohesive parameters are obtained with an inverse method. It was verified that the numerical R-curves agree with the experimental ones.

Keywords : Finite Element Method; Cohesive damage models; Bonded joints; Fracture.

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