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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of Porosity and Pore Distributions on Strength Properties of Porous Alumina
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Influence of Porosity and Pore Distributions on Strength Properties of Porous Alumina

机译：孔隙率和孔隙分布对多孔氧化铝强度特性的影响

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摘要

In this work, strength properties of porous alumina with three different porosities as well as dense one were investigated to clarify porosity effects on strength properties. It was revealed that the strength had a general tendency to decrease drastically as increasing porosity. Spatial and size distributions of pores were characterized by observing specimen surfaces through a laser scanning microscope. Based on the observed pore characteristics, a procedure to estimate porosity effects on strength was newly developed in the framework of fracture mechanics, where a stress intensity factor-based criterion was applied for fracture of porous ceramics. In the procedure, it is assumed that porous ceramics have the same characteristics of crack distribution as those of pore distribution, and pores are presumed to be surrounded by virtual cracks. Monte Carlo simulations by using the procedure were carried out to estimate strength for four respective materials. Simulated strength coincided with experimentally observed one within a scatter band of factor of 2(1/2). Consequently, the developed procedure was confirmed to be efficient in evaluating effects of bulk porosity and pore distributions on strength of porous alumina.
机译：在这项工作中，研究了多孔氧化铝的强度特性，具有三种不同的孔隙率以及致密的孔隙，以阐明对强度性质的孔隙效应。据透露，强度倾向于随着孔隙率的增加而减小。通过激光扫描显微镜观察样品表面，表征孔的空间和尺寸分布。基于观察到的孔隙特性，在骨折力学框架中新开发了一种估计对强度孔隙效应的程序，其中施加基于应力强度因子的标准用于多孔陶瓷的骨折。在该过程中，假设多孔陶瓷具有与孔分布的裂缝分布相同的特征，并且假定孔被虚拟裂缝包围。通过使用该程序的蒙特卡罗模拟是为了估算四种各种材料的强度。模拟强度与实验观察到的散射带内的一个（1/2）的散射带内。因此，证实开发的程序是有效的，以评价散装孔隙率和孔隙分布对多孔氧化铝强度的影响。

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