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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Adaption of a material model and development of a stochastic failure criterion for ceramic matrix composite structures
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Adaption of a material model and development of a stochastic failure criterion for ceramic matrix composite structures

机译：陶瓷基复合材料材料模型的适应和随机破坏准则的发展

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摘要

Ceramic matrix composites (CMCs) show high thermal resistance combined with damage tolerance and non-brittle failure. Therefore, they are suitable for mechanically loaded components at high temperatures. For dimensioning of components, an adaption of existing simulation and calculation methods for CMC materials is required. The material investigated in this work is a wound oxide CMC with a defined fiber orientation and a highly porous matrix. Due to manufacturing conditions, randomly distributed macroscopic pores are present in the composite. Since failure is initiated by these pores, a statistical investigation of strength is performed based on the weakest link theory. Several series of tensile tests were performed to reveal the relation between stress and strain and obtain their ultimate values. The application of two statistical criteria showed that fracture strains are well represented by Weibull distributions. The tensile tests were compared with results of finite element simulations, using the simulation software ANSYS (R). An anisotropic Weibull criterion was set up and adapted to the results of the tensile tests. Hereby, the anisotropic nonlinear deformation behavior as well as the scatter of failure strain could be reproduced by numerical simulations. The adapted material model and failure criterion were validated by further experiments and exemplified by application in a reliability analysis of a notional flame tube.
机译：陶瓷基复合材料（CMC）具有很高的耐热性，并具有耐损伤性和不脆性。因此，它们适用于高温下的机械负载部件。为了确定组件的尺寸，需要对CMC材料使用现有的仿真和计算方法。在这项工作中研究的材料是具有确定的纤维取向和高度多孔基体的缠绕氧化物CMC。由于制造条件的原因，复合物中存在随机分布的宏观孔。由于破坏是由这些孔引起的，因此基于最弱连接理论对强度进行统计研究。进行了一系列拉伸试验，以揭示应力和应变之间的关系，并获得其极限值。两项统计标准的应用表明，Weibull分布很好地代表了断裂应变。使用模拟软件ANSYS（R）将拉伸试验与有限元模拟结果进行了比较。建立了各向异性的威布尔准则，并将其适应于拉伸试验的结果。由此，可以通过数值模拟再现各向异性非线性变形行为以及破坏应变的分散。通过进一步的实验验证了改编的材料模型和破坏准则，并通过在理论火焰管的可靠性分析中的应用得到了例证。

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