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Demountable and reusable construction system for steel-concrete composite structures
Published in Airong Chen, Xin Ruan, Dan M. Frangopol, Life-Cycle Civil Engineering: Innovation, Theory and Practice, 2021
“General Explicit Contact” was used for the modelling of the contacts between the elements. This contact definition allows users to define contact between all or multiple areas of the model. These are all defined as a single interaction assuming any part of the model can be in contact with any other part. The interaction was defined as “Hard Contact” in the normal direction, i.e. no penetration of the elements was allowed. The tangential behaviour was described by Coulomb friction with a friction coefficient of 0.2. This value corresponds to steel surfaces with no surface finish.
An effective finite element modeling approach for prediction of the behaviour of a jute fibre-reinforced composite tube under axial impact
Published in International Journal of Crashworthiness, 2022
M. R. Karthika, Anindya Deb, G. S. Venkatesh
It may be pointed out that, in explicit FEA, solution of the system-level matrix equation of dynamics is carried out through numerical time integration by marching forward in time after assuming a central difference approximation for velocity, and other time derivatives being approximated consistently. At the end of each increment, the global stiffness matrix is updated based on changes in geometry and material behaviour as applicable, potentially arising out of large strains and/or rotation, and a given material becoming inelastic. A significant amount of computation time may be consumed toward detection of contact between parts, and estimating contact forces, through a penalty method. The explicit method is substantively more efficient than its traditional implicit counterpart as no iterations are necessary within a time increment, and a diagonal mass matrix ensures that the system of equations is already decomposed giving rise to a fast solution. On the flip side, explicit FEA is conditionally stable, and for accuracy of solution, the time step should not exceed a critical value. LS-DYNA is a well-known contact-driven explicit FEA code which has been adopted in the present study for prediction of test-based behaviour.