1,721,076 research outputs found
Numerical study of the mixed-mode delamination of composite interfaces
No full textIn this work we propose a new numerical formulation to compute the de- lamination onset and propagation along weak interfaces under mixed-mode conditions. The interfacial problem is addressed through a cohesive crack model, concentrating all the non-linearities at the interface. The accuracy of the proposed formulation is verified against predictions of a combined contact-delamination algorithm
Model reduction techniques in computational materials mechanics
No full textMulti-scale analyses, stochastic approaches and identification techniques represent research topics of growing interest in computational materials mechanics. In this context, it is often required to simulate complex situations, involving coupled phenomena and several nonlinearity sources. On the other hand, it may be needed to repeat the numerical analyses several times, with only a few varying parameters among those defining the problem of interest. Techniques aiming at exploiting the expected correlation between the different outputs are therefore particularly sought, in order to reduce the overall computational burden without a significant decay of the accuracy of the collected results. The present paper summarizes some computational experience in the field
Electro-mechanical problems in superconductiong coils
No full textThis paper presents the most recent research activity performed by the authors in the field of contact problems in superconducting coils. The research is related to the development of the coils for the experimental nuclear fusion machine “ITER”. The results here summarized are related to the inter-strand electromechanical behavior and its dependence on the electromechanical contact resistance. The effects related to the distribution of the superconducting zones within the wire, and of the mechanical properties of the materials are presented. Moreover a microscopical formulation for a more accurate treatment of the contact resistance is formulated. The adopted strategy is based on the statistical characterization of the surface roughness and the electro-mechanical behavior of the contacting asperities. In such a way the contact resistance is build up starting from a physical background
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