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首页> 外文会议>Mechanical properties and performance of engineering ceramics and composites VII >STRATEGIES TO OPTIMIZE THE STRENGTH AND FRACTURE RESISTANCE OF CERAMIC LAMINATES
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STRATEGIES TO OPTIMIZE THE STRENGTH AND FRACTURE RESISTANCE OF CERAMIC LAMINATES

机译：优化陶瓷层压板强度和抗断裂性的策略

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摘要

Layered ceramics, compared to conventional monolithic ceramics, are good choices for highly-loaded structural applications because they exhibit greater fracture resistance, higher strengths and better mechanical reliability (i.e. they are flaw tolerant materials). The use of tailored residual compressive stresses in the layers is a key parameter to adjust these properties. In this work ceramic laminates are analyzed which have internal residual compressive stresses. The most important factors having influence on the strength and fracture resistance of these laminates are discussed. A fracture mechanics analysis is employed to estimate the crack growth resistance of the material as a function of the crack length. It is found that the proper selection of a suitable strain mismatch (responsible for the generation of residual stresses), volume ratio of the layer materials and thickness and distribution of individual layers are crucial to achieve a high fracture resistance and/or a high lower limit (threshold) for strength in ceramic laminates. Design guidelines to avoid cracking of layers associated with high residual stresses are also provided. Design criteria to optimize strength and fracture resistance in advanced ceramics to be used in engineering applications are established.
机译：与传统的整体式陶瓷相比，层状陶瓷是高负荷结构应用的理想选择，因为它们具有更高的抗断裂性，更高的强度和更好的机械可靠性（即，它们是耐缺陷的材料）。在层中使用定制的残余压应力是调整这些特性的关键参数。在这项工作中，分析了具有内部残余压应力的陶瓷层压板。讨论了影响这些层压制品的强度和抗断裂性的最重要因素。断裂力学分析被用来估计材料的抗裂纹扩展性与裂纹长度的关系。已经发现，适当选择合适的应变失配（负责残余应力的产生），层材料的体积比以及各个层的厚度和分布对于获得高抗断裂性和/或高下限至关重要。 （阈值）用于增强陶瓷层压板的强度。还提供了避免与高残留应力相关的层破裂的设计准则。建立了设计标准，以优化工程应用中使用的高级陶瓷的强度和抗断裂性。

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