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首页> 外文会议>IUYAM Symposium on Theoretical and Numerical Methods in Continuum Mechanics of Porous Materials, Sep 5-10, 1999, Stuttgart, Germany >An Influence of Initial Porosity on Damage Process in Semi-Brittle Polycrystalline Ceramics under Compression
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An Influence of Initial Porosity on Damage Process in Semi-Brittle Polycrystalline Ceramics under Compression

机译：初始孔隙率对压缩条件下半脆性多晶陶瓷损伤过程的影响

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摘要

The initial porosity inside ceramics strongly influences the material response to applied mechanical load. In the paper two types of porosity were considered: distributed inside grains and along grain boundaries. Both types of porosity influence elastic material properties (compliance tensor S_ijkl). The pores distributed along grain boundary lead to significant crack resistance reduction in that part of the material. These local weakening places create preferential conditions for micro-cracks growth, which are responsible for internal damage process in macro-scale. The proposed theory was illustrated by uniaxial compression loading process of polycrystalline magnesium oxide sample.
机译：陶瓷内部的初始孔隙率强烈影响材料对施加的机械负载的响应。在本文中，考虑了两种类型的孔隙度：分布在晶粒内部和沿晶粒边界。两种类型的孔隙率都会影响弹性材料的性能（顺应张量S_ijkl）。沿晶界分布的孔导致材料的那部分的抗裂性显着降低。这些局部减弱的地方为微裂纹的生长创造了优先条件，这是宏观内部破坏过程的原因。多晶氧化镁样品的单轴压缩加载过程说明了所提出的理论。

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