Partner: Marek Boniecki

Institute of Electronic Materials Technology (PL)

Conference abstracts
1.Sadowski T., Postek E., Pietras D., Boniecki M., Szutkowska M., Modelling of Quasi-static and Dynamic Damage Process in Ceramic Matrix Composites, MECHCOMP 2019, 5th International Conference on Mechanics of Composites, 2019-07-01/07-04, Lizbona (PT), pp.80-81, 2019
Abstract:

Quasi-static degradation of brittle composites exhibits different mechanical response under uniaxial
tension and uniaxial compression. In this paper we analysed cracking processes and failure under
quasi-static loading of 2 phase ceramic material made of alumina and zirconia mixture, subjected to
tension and compression. Constitutive modelling of two phase ceramic composites obeys description
of: (1) elastic deformations of initially porous material, (2) limited plasticity and (3) cracks initiation
and propagation. Modelling of polycrystalline ceramics at mesoscopic level under mechanical loading is
related to analysis of a set of grains, which create so called Representative Volume Element (RVE). The
basic elements of the defect structure inside polycrystal are: micro- and meso-cracks, kinked and wing
cracks. To get macroscopic response of the material one can calculate averaged values of stress and strain over the RSE with application of analytical approach. Dynamic degradation process was illustrated
for 2 phase ceramic matix composite and cermet, which was subjected to short compressive impulse.
The pulse duration was 10-7s and the applied pressure level - 480 MPa. In the proposed more advanced
nite elements formulation of the cermet behaviour is was necessary to take into account the following
data and phenomena revealing inside of the RVE: (1) spatial distribution of the cermet constituents,
(2) system of grain boundaries/binder interfaces modelled by interface elemnets, (3) rotation of brittle
grains. The cermet response due to pulse loading is signifcantly different in comparison to the quasistatic
behaviour, i.e. the stress distributions and microcracking processes are quite different.

Keywords:

brittle composites, damage, quasi-static behaviour, dynamics, RVE

Affiliations:
Sadowski T.-Lublin University of Technology (PL)
Postek E.-IPPT PAN
Pietras D.-Lublin University of Technology (PL)
Boniecki M.-Institute of Electronic Materials Technology (PL)
Szutkowska M.-Institute of Advanced Manufacturing Technology (PL)
2.Postek E., Sadowski T., Boniecki M., Impact of Al2O3/ZrO2 Composite, Qualitative Comparison of Compositions, RANM2019, Fourth International Conference on Recent Advances in Nonlinear Mechanics, 2019-05-07/05-10, Łódź (PL), pp.226-228, 2019
Abstract:

The ceramic composites Al2O3/ZrO2 are used for different kind of implants
since they are nontoxic and nonallergic [1]. The composites of different composition
of both compounds are obtained by sintering at the temperature 1600◦C. The amount
of zirconia in the composite is normally up to 30% volume. The investigation of such
properties like Youngs modulus, toughness and flexural strength is presented in [2]. The
properties of ZrO2 compound with stabilization of Y2O3 are described in [3].

Keywords:

Al2O3/Zr02, composite compositions, impact, peridynamics

Affiliations:
Postek E.-IPPT PAN
Sadowski T.-Lublin University of Technology (PL)
Boniecki M.-Institute of Electronic Materials Technology (PL)