engleski

Discrete softening-damage model for fracture process representation with embedded strong discontinuities

A damage softening model is implemented into a discrete lattice framework with embedded strong discontinuities for the discontinuous representation of fracture. Such a model fits heterogeneous framework and allows capturing the complex fracture mechanisms in quasi-brittle materials under various quasi-static and dynamic loading conditions. Finite element implementation of damage softening constitutive model provides a very powerful computational tool for a description of material degradation processes which happen during monotonic loading, as well as unloading and reloading on the damaged material. In particular, the proposed model can capture the processes such as reduction of material stiffness, crack opening-closing mechanisms and reloading that follows the inverse of compliance modulus. Numerical examples are performed to demonstrate the effectiveness and robustness of the model fracture capabilities. The two examples deal with quasi-static fracture mechanisms of a heterogeneous material. The fragmentation of a cylinder in dynamics framework subjected to internal pressure and inertial forces is given as well. The plots of all components of internal energy (the dissipated fracture energy, elastic strain and kinetic energy) in dynamic fracture process are provided. The model of this kind can simulate multiple cracks formation, coalescence, propagation and mesh independent results.

mechanical fracture ; discrete lattice model ; embedded strong discontinuities ; damage mechanics ; crack propagation

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