• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Science Research International >Assessment of Damage Tolerance and Reliability for Ceramics
【24h】

Assessment of Damage Tolerance and Reliability for Ceramics

机译：陶瓷的损伤容忍度和可靠性评估

获取原文
获取原文并翻译 | 示例
       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The risk of fracture does exist even in the carefully designed ceramic components under excess stress unexpected in design procedure such as high stresses caused by restraining the deformation at the contact region of the component. To assess the safety and the reliability of ceramics components under such circumstances, it is indispensable to take the damage tolerance of the material into consideration. Ceramics is thought to be perfectly brittle and have no damage tolerance. But, though very little, it has the damage tolerance. The important problems open to us now are to estimate the extent of the damage tolerance of ceramics quantitatively and to clear the relation between the damage tolerance of the material and the reliability of the component. In this paper, we demonstrate the existence of the damage tolerance in the ceramics by tests using specimens of a porous cordierite. The nonlinear stress-strain curve of the brittle material is thought to be a reflection of the damage tolerance of the material and it is shown that the nonlinear stress-strain curve obtained can be simulated by the distributed micro cracks model developed here. The relation between the damage tolerance and the reliability is also discussed through several simulation works. These simulations show that when the damage tolerance of the material is getting larger, the reliability of the component becomes higher. This conclusion is supported by the fracture test results using notched specimens of a porous cordierite where the notch sensitivity is shown to be very small in this material. This means that this material has the high reliability under the stress concentration.
机译：即使在精心设计的陶瓷部件中，在设计过程中未曾预料到的过大应力下（例如，由于限制部件接触区域的变形而产生的高应力），也确实存在破裂的风险。为了在这种情况下评估陶瓷组件的安全性和可靠性，必须考虑材料的损伤容限。陶瓷被认为是完全易碎的，并且没有损伤容限。但是，尽管很小，但它具有损伤容限。现在向我们开放的重要问题是定量地评估陶瓷的损伤容限，并弄清材料的损伤容限与部件可靠性之间的关系。在本文中，我们通过使用多孔堇青石样品进行测试来证明陶瓷中存在损伤容限。脆性材料的非线性应力-应变曲线被认为反映了材料的损伤容限，并且表明可以通过此处开发的分布式微裂纹模型来模拟获得的非线性应力-应变曲线。通过几个仿真工作还讨论了损伤容忍度与可靠性之间的关系。这些模拟表明，当材料的损伤容限变大时，组件的可靠性会变高。使用多孔堇青石的缺口样品的断裂测试结果支持了该结论，该材料的缺口敏感性非常小。这意味着该材料在应力集中下具有高可靠性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号