Einfluss keramischer Partikel- und Faserverstärkungen in Metall-Matrix-Verbundwerkstoffen auf das VHCF-Verhalten

金属基复合材料中陶瓷颗粒和纤维增强材料对 VHCF 行为的影响

• 批准号: 239351524
• 负责人: Dr. Felix Ballani
• 金额: --
• 依托单位: Institut für Werkstofftechnik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/239351524?language=en
• 关键词: Einfluss; keramischer; Partikel; und; Faserverst

During technical operation, high performance materials are very often exposed to cyclic loading conditions leading to damage accumulation until the final fatal fracture. At the same time, quite high requirements with regard to high number of cycles without any damage are claimed for major part of components. The aim of the proposed project is the investigation of the cyclic deformation behaviour of Al-Al2O3 MMCs in the range of very high cycle fatigue (VHCF) in dependence both on the geometry of the reinforcement (particles, fibres) as well as on the strength of the matrix material (T6 and overaged). Hence, besides the classical methods of microstructural analysis the infrared thermography as well as the analysis of the resonant frequency and the damage parameter will be established in order to determine the beginning of damage as well as the local damage area. Therefore, information on the damage accumulation can be obtained. Starting from experimental observations, the Weibull distributed damage behaviour of Al-Al2O3 MMCs will be described using stochastic models, which offers possibilities for the determination of damage probabilities. Moreover, the influence of the ceramic reinforcements on the very high cycle fatigue life will be investigated and described by newly developed models. Thus, the proposed project gives on one hand a description of the experimental variations of the life times as well as a significant contribution to the clarifying of a possible application of this type of material in the very high cycle fatigue regime.

在技术操作过程中，高性能材料经常暴露在循环加载条件下，导致损伤累积，直到最终发生致命断裂。同时，对主要部件的高循环次数、无损坏要求也相当高。拟议项目的目的是研究Al-Al2O3 mmc在非常高循环疲劳（VHCF）范围内的循环变形行为，这取决于增强材料的几何形状（颗粒、纤维）以及基体材料的强度（T6和过时效）。因此，除了经典的微结构分析方法外，还需要建立红外热像仪以及谐振频率和损伤参数的分析，以确定损伤的开始和局部损伤区域。因此，可以获得损伤累积的信息。从实验观察出发，使用随机模型描述Al-Al2O3 mmc的威布尔分布损伤行为，这为确定损伤概率提供了可能性。此外，还将用新建立的模型研究和描述陶瓷增强材料对超高速循环疲劳寿命的影响。因此，提议的项目一方面给出了寿命时间的实验变化的描述，以及对澄清这种类型的材料在非常高周疲劳状态下的可能应用的重大贡献。