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Materiale Plastice (Mater. Plast.), Year 2016, Volume 53, Issue 2, 222-226



Vasile Nastasescu, Silvia Marzavan

A Model with Free Particles Used for Numerical Simulation of Charpy Impact Test of Plastic Materials


Abstract:
This paper presents a model for the numerical simulation of Charpy test, using together Smoothed Particle Hydrodynamics (SPH) Method and Finite Element Method. Numerical simulation of the mechanical tests require the use of special material models, so the material fracture to be also simulated. The new numerical method, SPH Method, in fact a version of the Free Particle Method, presents some important advantages among which no material failure criterion to be used. Our proposed model is a model combining the FEM and SPH Model: only the specimen is modeled only by particles. The numerical results are compared with the results using only FEM and finally with the experimental data. Avoiding the material models, in fact the failure criterion, by SPH method presents a great advantages because any material model (Plastic-kinematic, Johnson-Cook, Modified Johnson-Cook, Picewise linear plasticity etc.) involves knowledge about some material constants. This aspect is very important and in the same time, very difficult. The numerical model together with some theoretical fundamentals of the SPH Method could be more then an invitation for using the SPH Method, it could be an available model able to inspire the researchers in their work. The paper is finished after some conclusions.


Keywords:
Charpy test; free particles; numerical simulation; FEM; SPH

Issue: 2016 Volume 53, Issue 2
Pages: 222-226
Publication date: 2016/6/30
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