Auxetic cellular materials show great potential for improv-ing properties in case of impact loading. Due to this poten-tial auxetic structures made from inverted tetrapods were extensively experimentally and computationally analysed. The built samples were compressed in two orthogonal di-rections to determine their base mechanical properties and deformation mechanisms. The lattice computational model was developed and validated using the experimental results. A new shape optimisation procedure to develop new auxe-tic structures with functionally graded geometry is pro-posed and tested in a case study. With introduction of the functionally graded geometry the response of the auxetic structure can be tailored to a particular loading condition, which is especially important in impact or ballistic perfor-mance of modern composite materials.
COBISS.SI-ID: 20853014
Comparison of three different modelling methods in LS-DYNA for blast loading simulations of auxetic sandwich structures is presented in this work. The ConWep, SPH and ALE modelling methods were verified and validated using experimental data from literature. The best correlation with experimental data was achieved by using the SPH modelling method, which was then further used for simulating the blast loading of the auxetic sandwich structure. The simulation results show that the maximum displacement of the blast loaded plate is lower in case of using the auxetic sandwich structure than in the case of using the monolithic steel panel.
COBISS.SI-ID: 20839702