Abstract
This article describes a new research method of the mechanical features estimation and damage evolution assessment for porous ceramics in compression. The method couples micromechanical and phenomenological modelling with experiment. It requires determination of the initial material structure by SEM, quasi-static tests of ceramic samples subjected to compressive loading with unloading and multiple reloading. As a result, a detailed analysis of material constants and damage assessment is possible. At micromechanical level of modelling sets of distributed pores and cracks are described by application of Representative Surface Element with averaging procedure, what yields a macroscopic material behaviour. The phenomenological approach bases on macroscopic material damage variable (the second order tensor) with some criteria of cracks nucleation, their propagation and final failure of the material sample. Experiments were conducted on ceramic samples of alumina and magnesia with various porosity fraction (0 to 30‰). The main advantages of the proposed method: examination of brittle materials in the process of controlled deformation, estimation of the global material stiffness tensor by deformation analysis and current damage anisotropy assessment.
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Samborski, S., Sadowski, T. (2006). EXPERIMENTAL INVESTIGATIONS AND MODELLING OF POROUS CERAMICS. In: Sadowski, T. (eds) IUTAM Symposium on Multiscale Modelling of Damage and Fracture Processes in Composite Materials. SOLID MECHANICS AND ITS APPLICATIONS, vol 135. Springer, Dordrecht. https://doi.org/10.1007/1-4020-4566-2_31
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DOI: https://doi.org/10.1007/1-4020-4566-2_31
Publisher Name: Springer, Dordrecht
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