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Dynamic fracture analysis of adhesively bonded joints using explicit methods
An experimental and computational study of adhesively bonded test configuration of the double cantilevered beams (DCB) using Cohesive Zone Models under dynamic loading is presented. Explicit methods which have a marked advantage over implicit methods for dynamic analysis have been used. The response of the DCB test specimens were modeled in LS-DYNA(registered trademark). Cohesive zone model (CZM) which define the interfacial tractions to the opening displacements are used to model crack initiation and crack growth in the adhesive. Parameters for the CZM law are determined using experimental data from simple test configurations like the DCB for Mode I. The CZM law implemented through a user defined material model (UMAT) was used to model the adhesive in the adhesively bonded DCBs. Simulations for DCB with aluminum adherends correlated very well to the experiments. Good correlation between the simulation and the experiment for the composite DCB is achieved if the displacement history of the adherend tip, obtained from digital images, is used as the prescribed boundary conditions, instead of the conventional assumption of a constant velocity being imparted to the adherends tips by the falling wedge in the drop tower.
Dynamic fracture analysis of adhesively bonded joints using explicit methods
An experimental and computational study of adhesively bonded test configuration of the double cantilevered beams (DCB) using Cohesive Zone Models under dynamic loading is presented. Explicit methods which have a marked advantage over implicit methods for dynamic analysis have been used. The response of the DCB test specimens were modeled in LS-DYNA(registered trademark). Cohesive zone model (CZM) which define the interfacial tractions to the opening displacements are used to model crack initiation and crack growth in the adhesive. Parameters for the CZM law are determined using experimental data from simple test configurations like the DCB for Mode I. The CZM law implemented through a user defined material model (UMAT) was used to model the adhesive in the adhesively bonded DCBs. Simulations for DCB with aluminum adherends correlated very well to the experiments. Good correlation between the simulation and the experiment for the composite DCB is achieved if the displacement history of the adherend tip, obtained from digital images, is used as the prescribed boundary conditions, instead of the conventional assumption of a constant velocity being imparted to the adherends tips by the falling wedge in the drop tower.
Dynamic fracture analysis of adhesively bonded joints using explicit methods
Makhecha, Dhaval P. (author) / Kapania, Rakesh K. (author) / Johnson, Eric R. (author) / Dillard, David A. (author)
2006
15 Seiten, 20 Quellen
Conference paper
English
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