engleski

Energy balance in simulations of dynamic localized failure propagation with strain softening

In this work we present the total energy balance in dynamically driven localized failure propagation. The full energy balance is investigated on the well known benchmark prob- lem where pre-notched plate is subjected to edge impulsive load or projectile causing the dynamic crack propagation until failure, which is experimentally shown in [1]. The localized failure in material is represented by embedded strong discontinuity formula- tion exhibiting the jump in the displacement field leading to correct formulation for strain softening response which remains independent on the chosen mesh. For this purpose, we give the results obtained with two different models, both using the embedded strong dis- continuities. The first one is the discrete lattice model, based on Voronoi tessellation and cohesive links with enhanced kinematics [2, 3]. The other one uses constant strain triangle elements equipped with embedded strong discontinuities [4]. The total input work introduced into the system by external loads is monitored in time, while internal energy balance in damage and plasticity softening is maintained by ex- changing the kinetic energy, strain energy, plastic free energy and dissipated energy in time. The role of fracture energy is also explained through the energy balance principles

Dynamic localized failure ; Embedded strong discontinuities ; Energy balance

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