Experimentelle und modellmäßige Bewertung der dreidimensionalen Auswirkung mikrostruktureller Barrieren während der Rissinitiierungphase VHCF-beanspruchter Werkstoffe

VHCF 应力材料裂纹萌生阶段微观结构障碍三维影响的实验和建模评估

• 批准号: 172277823
• 负责人: Professor Dr.-Ing. Hans Jürgen Christ
• 金额: --
• 依托单位: Lehrstuhl für Materialkunde und Werkstoffprüfung
• 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 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/172277823?language=en
• 关键词: Experimentelle; und; modellm; ige; Bewertung

Even after one billion cycles, components made of metallic materials may show traces of plastic deformation without being failed. However, the same components can fracture at the same load but a lower number of cycles. The hypothesis of the present research that the resistance of microstructural barriers to dislocation motion decides about the occurrence of fatigue damage will be quantified by duplex steel of different strength of the ferrite and austenite phase. Furthermore, important aspects, such as the simultaneous plasticity and residual stress distribution between the two phases, as well as the stochastic arrangement of fatigue-critical microstructural clusters will be analyzed. The important question about the influence of environmental effects on the VHCFdamage is going to be addressed by experiments in different atmospheres. Three interacting modern experimental and theoretical approaches are used: (i) ultrasonic fatigue testing in combination with in-situ analysis techniques (ii) three-dimensional microstructural reconstruction and spatially-resolved diffraction measurements using high energy synchrotron radiation and (iii) finite element modeling of the elastic and plastic anisotropic fatigue deformation within the twophase microstructure as a base of a damage-tolerant life prediction concept for the VHCF regime as well as an possibility for structural optimization of fatigue-resistant materials.

即使经过十亿个周期，由金属材料制成的组件也可能显示出塑性变形的痕迹而不会失败。但是，相同的组件可能会在同一负载下破裂，但循环数量较低。本研究的假设是，微结构屏障对位错运动的抗性决定了疲劳损伤的发生，将通过双层钢和奥斯丁岩相的强度不同。此外，将分析重要方面，例如两个阶段之间的同时可塑性和残余应力分布，以及疲劳临界微结构簇的随机排列。关于环境影响对VHCFDAMAGE的影响的重要问题将通过不同气氛中的实验来解决。使用了三种相互作用的现代实验和理论方法：（i）超声疲劳测试与原位分析技术（ii）三维微结构重建和空间分辨衍射测量的三维微观重建和高能衍射测量，并使用高能量同步辐射和（iii）在弹性和（iii）的（III）弹性型塑料中构图量构造型塑料和塑料量划分量VHCF制度的耐受耐受寿命预测概念以及对抗疲劳材料的结构优化的可能性。