Very high cycle fatigue mechanisms in small scale Al and Cu and alloy material investigated by simulation and novel uniaxial and multiaxial micro fatigue experiments

通过模拟和新型单轴和多轴微疲劳实验研究小尺寸铝、铜和合金材料的极高循环疲劳机制

• 批准号: 173398005
• 负责人: Professor Dr. Christoph Eberl
• 金额: --
• 依托单位: Professur für Mikro- und Werkstoffmechanik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/173398005?language=en
• 关键词: Very; cycle; fatigue; mechanisms; small

The aim of this proposal is to understand the active fatigue mechanisms in Al, Cu, Fe and alloys in small volumes. Even though such materials are widely used in safety relevant applications (sensors, micro and powerelectronics), only little research can be found on reliability. Since scaling and size effects will change the fatigue behavior of small scale materials, modells and know-how from the macro world cannot be easily transfered to the micro world.Recent experimental results from the forst phase of the SPP1466 suggest that a stochastic model could be used to reliably describe the materials' properties. Spcifically, the orientation of neighboring grains plays a significant role in the fatigue induced damage process. Therefore, one focus will be to understand local damage formation which will be backed up by discrete dislocation dynamics simulations of grain agglomerats. The experimental possibilities shall be enhanced by a second setup which should be vacuum compatible to be used in a vakuum chamber to reduce air friction and improve precission or in an SEM to do in-situ fatigue testing. Besides fcc metals and their alloys, also bcc metals will be tested and simulated to get a stronger connection to other members of the SPP1466.

本提案的目的是了解小体积的Al、Cu、Fe和合金的主动疲劳机制。尽管这种材料广泛用于安全相关的应用（传感器，微型和电力电子），但只有很少的研究可以找到可靠性。由于尺度效应和尺寸效应会改变小尺度材料的疲劳行为，宏观世界的模型和知识很难转移到微观世界，最近SPP 1466第一阶段的实验结果表明，随机模型可以用来可靠地描述材料的性能。特别是，相邻晶粒的取向在疲劳损伤过程中起着重要的作用。因此，一个重点将是了解局部损伤的形成，这将支持离散位错动力学模拟的晶粒团聚。实验可能性应通过第二个装置来增强，该装置应与真空室中使用的真空兼容，以减少空气摩擦并提高精度，或在SEM中进行原位疲劳测试。除了面心立方金属及其合金，体心立方金属也将进行测试和模拟，以获得与SPP 1466其他成员更强的连接。