High frequency resonance pulsator

高频共振波轮

• 批准号: 468976436
• 金额: --
• 依托单位: Hochschule Kaiserslautern
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2021
• 资助国家: 德国
• 起止时间: 2020-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/468976436?language=en
• 关键词: frequency; resonance; pulsator

The fatigue life of materials and components is limited when they are subjected to repeated mechanical loads, which is why an understanding of the damage development, taking into account influencing factors, and the estimation of the fatigue life based on this are of great importance for technical applications. In this context, it is important to differentiate between the fatigue life ranges in which materials and components are subjected to fatigue loads, since the damage mechanisms change from the low-cycle-fatigue (LCF) to the high-cycle-fatigue (HCF) and to the very-high-cycle-fatigue (VHCF) range.In the sense of a (remaining) fatigue life estimation or evaluation, it is therefore necessary that comprehensive material information is determined and provided, which describes the microstructure and the associated material mechanisms. Measurement techniques based on thermometry, resistometry and magnetics are able to detect microstructural changes of metallic materials in early fatigue stages and thus provide a significant gain in information compared to conventional stress-strain hysteresis measurements. The measured values and curves provided in fatigue tests using the aforementioned methods can be used as input variables in the short-time methods for fatigue life calculations StressLife, StrainLife and SteBLife developed by the applicant, which can significantly reduce the test and cost effort required to provide fatigue data. It should be noted here that the applicant's investigations to date have been limited to the LCF and HCF range due to the existing test infrastructure, which repeatedly leads to restrictions with regard to the application potential of the short-time methods. The aim of the application for large-scale equipment is therefore the procurement of a high-frequency test system, which should provide the possibility of extending the test spectrum to the VHCF range, which should also enable the extension of the short-time methods StressLife, StrainLife and SteBLife using the above-mentioned measurement procedures and methods. This results in new questions that are within the research strategy of the Department of Materials Science and Testing at the University of Applied Sciences of Kaiserslautern. The applicant is well aware that the damage mechanisms in the HCF and VHCF areas are different and must be considered in a differentiated manner, however, experience from completed research projects can be drawn upon. In addition, the proposed test system should provide the possibility of reducing the test time for validation tests due to the higher test frequencies (statistical validation) and also enable investigations into the dependence of the deformation rate, which should also be included as a parameter extension in the above-mentioned short-time methods.

材料和部件在承受重复的机械载荷时，其疲劳寿命是有限的，因此了解损伤的发展情况，考虑影响因素，并据此估计疲劳寿命对于技术应用非常重要。在这种情况下，区分材料和部件承受疲劳载荷的疲劳寿命范围非常重要，因为损坏机制从低周疲劳（LCF）变为高周疲劳（HCF）和甚高周疲劳（VHCF）范围。从（剩余）疲劳寿命估计或评估的意义上来说，因此有必要 确定并提供全面的材料信息，描述微观结构和相关的材料机制。基于测温、电阻测量和磁学的测量技术能够检测金属材料在早期疲劳阶段的微观结构变化，从而与传统的应力应变磁滞测量相比，提供显着的信息增益。采用上述方法进行疲劳试验时提供的测量值和曲线可以作为申请人开发的疲劳寿命计算StressLife、StrainLife和SteBLife的短时方法的输入变量，可以显着减少提供疲劳数据所需的试验和成本。这里需要指出的是，由于现有的测试基础设施，申请人迄今为止的研究仅限于LCF和HCF范围，这一再导致短时方法的应用潜力受到限制。因此，大型设备应用的目标是采购高频测试系统，该系统应提供将测试频谱扩展到VHCF范围的可能性，这还应能够使用上述测量程序和方法扩展短时方法StressLife、StrainLife和SteBLife。这产生了凯泽斯劳滕应用科学大学材料科学与测试系研究策略范围内的新问题。申请人清楚地意识到HCF和VHCF区域的损害机制是不同的，必须以不同的方式考虑，但是，可以借鉴已完成的研究项目的经验。此外，由于较高的测试频率（统计验证），所提出的测试系统应提供减少验证测试测试时间的可能性，并且还能够研究变形率的依赖性，这也应作为参数扩展包含在上述短时方法中。