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首页> 外文会议>Ceramic microstructures : Control at the atomic level >DESIGN AND LIFE PREDICTION ISSUES FOR HIGH-TEMPERATURE ENGINEERING CERAMICS AND THEIR COMPOSITES
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DESIGN AND LIFE PREDICTION ISSUES FOR HIGH-TEMPERATURE ENGINEERING CERAMICS AND THEIR COMPOSITES

机译：高温工程陶瓷及其复合材料的设计和寿命预测问题

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摘要

Perspectives are presented on ceramics and ceramic matrix composites (CMCs) as high temperature materials. The emphasis is on design and life prediction requirements and their role in directing research. Important themes include the relative roles of fracture toughness and inelastic strain (ductility), as well as scaling and stochastic effects caused by manufacturing defects. Ceramics with high toughness have been developed. But, because they are inductile, design with such materials is based on elastic stresses, combined with weakest link scaling and extreme value statistics. Procedures that ensure reliable performance under these circumstances are inherently constrained. Opportunities to mitigate these restrictions by matching mechanisms to design are explored. By contrast CMCs exhibit inelastic strain mechanisms that provide an efficient means of redistributing stress. These mechanisms eliminate stress concentrations and suppress scaling effects, enabling design procedures similar to those used with metals. The sources and mechanisms of inelastic strain are described, as well as the ensuing constitutive models. Examples of their finite element implementation in design are presented. A life prediction methodology requires a robust procedure for characterizing fatigue effects in conjunction with manufacturing and machining flaws. A lifting approach is described having commonalty between ceramics and CMCs.
机译：提出了作为高温材料的陶瓷和陶瓷基复合材料（CMC）的观点。重点是设计和寿命预测要求及其在指导研究中的作用。重要主题包括断裂韧性和非弹性应变（延性）的相对作用，以及由制造缺陷引起的结垢和随机效应。已经开发了具有高韧性的陶瓷。但是，由于它们是电感性的，因此使用此类材料进行设计是基于弹性应力，结合了最弱的链接缩放和极值统计。在这种情况下，确保可靠性能的过程会受到固有的限制。探索了通过与设计相匹配的机制来减轻这些限制的机会。相比之下，CMC表现出非弹性应变机制，提供了重新分配应力的有效方法。这些机制消除了应力集中并抑制了结垢效应，从而使设计程序类似于金属所使用的设计程序。描述了非弹性应变的来源和机理，以及随后的本构模型。介绍了其在设计中的有限元实现示例。寿命预测方法需要一个健壮的过程来表征疲劳效应以及制造和加工缺陷。描述了在陶瓷和CMC之间具有共同点的提升方法。

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