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首页> 外文会议>IUTAM Symposium on Multiscale Modelling of Damage and Fracture Processes in Composite Materials; 20050523-27; Dolny(PL) >EXPERIMENTAL INVESTIGATIONS AND MODELLING OF POROUS CERAMICS
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EXPERIMENTAL INVESTIGATIONS AND MODELLING OF POROUS CERAMICS

机译：多孔陶瓷的实验研究与建模

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摘要

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.
机译：本文介绍了一种新的研究方法，该方法用于评估多孔陶瓷在压缩状态下的力学特性，并评估其损伤演变。该方法将微观力学和现象学建模与实验相结合。它需要通过SEM确定初始材料结构，对承受压缩载荷，卸载和多次重新加载的陶瓷样品进行准静态测试。结果，可以对材料常数进行详细分析并进行损伤评估。在微机械建模水平上，通过应用代表性表面元素和平均程序来描述分布的孔和裂缝的集合，这产生了宏观的材料行为。现象学方法基于宏观的材料损伤变量（二阶张量），并带有一些裂纹成核，裂纹扩展和材料样品最终破坏的标准。对具有不同孔隙率分数（0至30％）的氧化铝和氧化镁陶瓷样品进行了实验。该方法的主要优点是：在受控变形过程中检查脆性材料，通过变形分析和电流损伤各向异性评估来估计整体材料刚度张量。

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