0918 Dynamic performance of ceramic composites and composite structures

  • Eligiusz Postek, Institute of Fundamental Technological Research Polish Academy of Science
  • Tomasz Sadowski, Lublin University of Technology

Ceramic materials stand for polycrystals of a complex internal structure. The materials are used in structures of high importance, for example, cutting tools, drilling devices, jet engines, and many others. Examples of such materials are multiphase polycrystals, for example, WC/Co, SiC/Al, Al2O3/Ti(C,N)/ZrO2. The combination of phases of different properties yields a complex microstructure.

The dynamic phenomena are very diverse. During high-velocity impact, complex phenomena like cracks, fragmentation, and phase transformation in a ceramic-metal matrix composite appear. The behavior of CMM and composites of all brittle phases are qualitatively different. Special attention is given to the influence of imperfections, for example, inclusions, voids within the polycrystalline materials on their performance. It can be noted that during the manufacturing process imperfections in the interfaces of phases appear in the form of initial cracks and discontinuities. Due to existing phenomena at very low scales the nonlocal methods in mechanics are of interest. In particular, the gradient methods and peridynamics.

In recent decades, the advancement of numerical methods has allowed for the analysis of impact phenomena not only because of theory development but also due to the application of high-performance computing. Numerical analysis often makes possible to have an insight into the rapid processes that are practically impossible to follow during experiments. It is focused on numerical models and their verification. The numerical methods are as follows: finite element method, discrete element method, and meshless methods. In particular, high attention is paid to the modifications of the standard methods to take into account nonlocal solid mechanics phenomena, molecular dynamics and ab initio methods.

The experiments of interest obey low-velocity impacts (dynatup, Charpy pendulum) high-velocity impacts, high strain rate (Taylor bar and Hopkinson bar), and penetration tests including temperature effects. The symposium is open for reporting novel experimental techniques widening methods of estimation different thermo-dynamical properties of novel composite materials and structural elements applied to the solution of advanced engineering problems.

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