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Static and dynamic flexural strength of 99.5% alumina: Relation to porosity

机译:99.5%氧化铝的静态和动态弯曲强度:与孔隙率的关系

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摘要

Advanced ceramic materials are widely implemented in a variety of cutting edge engineering applications. Their dynamic flexural strength is an important property under impact loading conditions. Therefore, this work reports a systematic comparison of static and dynamic flexural strength results for 99.5% commercial alumina, obtained using a recently reported adaptation of the 1-point impact experimental technique. Specimens of the same size and surface roughness conditions were used in this study, in a large sample batch, thus allowing for estimation of basic statistical parameters for the evaluated material. The main observation is that the flexural strength of this material is distinctly rate-sensitive, a point that was explained by fracture surface porosity levels corresponding to the different loading regimes. During static loading the crack apparently selects a weaker path, by connecting between pores, with a resulting lower strength values and rougher fracture surface. Under dynamic loading conditions, the fracture surface is smoother and the crack path connects only the larger pores, accompanied by an increase in dynamic flexural strength.
机译:先进的陶瓷材料广泛应用于各种前沿工程应用中。它们的动态抗弯强度是冲击载荷条件下的重要性能。因此,这项工作报告了对99.5%商用氧化铝的静态和动态弯曲强度结果的系统比较,该结果是使用最近报告的1点冲击实验技术的改编获得的。在本研究中,使用了具有相同大小和表面粗糙度条件的标本,用于大批样品中,因此可以估算被评估材料的基本统计参数。主要观察结果是该材料的抗弯强度对速率具有明显的敏感性,这一点可以通过与不同加载方式相对应的断裂表面孔隙度来解释。在静态载荷下,裂纹显然通过连接孔之间选择了一条较弱的路径,从而导致强度值较低且断裂表面较粗糙。在动态载荷条件下,断裂表面更光滑,裂纹路径仅连接较大的孔,并伴随动态抗弯强度的增加。

著录项

  • 来源
    《Mechanics of materials》 |2012年第5期|p.43-55|共13页
  • 作者

    A. Belenky; D. Rittel;

  • 作者单位

    Faculty of Mechanical Engineering, Technion, Israel Institute of Technology, 32000 Haifa, Israel;

    Faculty of Mechanical Engineering, Technion, Israel Institute of Technology, 32000 Haifa, Israel;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    flexural strength; alumina; porosity; fracture surfaces; microstructure;

    机译:抗弯强度;氧化铝孔隙率断裂面微观结构;

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