INFLUENCE OF CERAMIC FOAM PARAMETERS ON THE FRACTURE BEHAVIOUR UPON THE TENSILE TEST

článek ve sborníku ve WoS nebo Scopus

en

The contribution deals with numerical simulation of response of the open cell ceramic foam to tensile loading and attempts to predict experimental fracture-mechanics behaviour of the foams using numerical FE model composed of beam elements. Models of different structure irregularity (including regular one) are considered and generated using 3D Voronoi tessellation technique. Complete fracture of the model is simulated by iterative FE simulations where in each step, one strut with maximal tensile stress (higher than the material tensile strength) is removed until complete separation of the model in two parts. Critical forces, leading to complete breakage of the foam structure, together with final fracture "surfaces", are investigated and compared for both regular and irregular structures. It is shown that the regular foam structure, composed of Kelvin cells, exhibit generally 10 – 20 % higher fracture resistance than the irregular foam structures and also that structures with smaller cells should be more fracture resistant than the structures with bigger cells.

The contribution deals with numerical simulation of response of the open cell ceramic foam to tensile loading and attempts to predict experimental fracture-mechanics behaviour of the foams using numerical FE model composed of beam elements. Models of different structure irregularity (including regular one) are considered and generated using 3D Voronoi tessellation technique. Complete fracture of the model is simulated by iterative FE simulations where in each step, one strut with maximal tensile stress (higher than the material tensile strength) is removed until complete separation of the model in two parts. Critical forces, leading to complete breakage of the foam structure, together with final fracture "surfaces", are investigated and compared for both regular and irregular structures. It is shown that the regular foam structure, composed of Kelvin cells, exhibit generally 10 – 20 % higher fracture resistance than the irregular foam structures and also that structures with smaller cells should be more fracture resistant than the structures with bigger cells.

Ceramic foam, Fracture, FEM, Voronoi tessellation, Tensile test

15.05.2017

ACAD SCI CZECH REPUBLIC, INST THERMOMECHANICS, DOLEJSKOVA 5, PRAGUE 8, 182 00, CZECH REPUBLIC

Praha

978-80-214-5497-2

1805-8248

Engineering Mechanics 2017

2017

1

862–865

1150