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首页> 外文期刊>Mechanics of materials >Static and dynamic flexural strength of 99.5% alumina: Relation to surface roughness
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Static and dynamic flexural strength of 99.5% alumina: Relation to surface roughness

机译：99.5％氧化铝的静态和动态弯曲强度：与表面粗糙度的关系

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摘要

The dynamic flexural strength of ceramics is an important property for all applications involving 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 systematically varying surface roughness conditions were used in this study to assess the influence of the latter on the static and dynamic strength of this material. The investigated roughness levels ranged from 0.8 μm (coarse) to 0.05 μm (fine, polished). Under static loading, reducing the surface roughness causes a 10% increase in flexural strength for polished specimens. By contrast, the dynamic flexural strength is apparently not influenced by the surface roughness. A thorough microstructural and frac-tographic examination reveals the presence of bulk (surface) pore-like flaws that are not obliterated by the polishing process and therefore govern the failure process. It is suggested that strength improvements can be reached by suitable surface preparation, provided no bulk pores are native in the material, some of which are present on its surface. The identification of the role of surface flaws is expected to clarify the discrepancy found in the literature as to the influence of surface roughness on the mechanical properties of brittle materials.
机译：陶瓷的动态挠曲强度对于涉及冲击载荷条件的所有应用都是重要的性能。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。在这项研究中，使用了相同尺寸和系统变化的表面粗糙度条件的样品，以评估后者对这种材料的静态和动态强度的影响。研究的粗糙度范围从0.8微米（粗）到0.05微米（细，抛光）。在静态载荷下，减小表面粗糙度会导致抛光试样的抗弯强度提高10％。相反，动态弯曲强度显然不受表面粗糙度的影响。彻底的微观结构和分数形貌检查显示，存在大量（表面）孔状缺陷，这些缺陷不会被抛光过程所掩盖，因此可以控制破坏过程。建议通过适当的表面处理可以达到强度的提高，前提是该材料中没有天然的毛孔，其中一些存在于其表面。表面缺陷的作用的鉴定有望澄清文献中发现的关于表面粗糙度对脆性材料的机械性能的影响的差异。

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  • 来源
    《Mechanics of materials》 |2012年第11期|p.91-99|共9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

    alumina; surface roughness; flexural strength; 1-point impact; pores;

    机译：氧化铝表面粗糙度;抗弯强度;1点影响;毛孔;

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