Use of gamma-magnetic test methods for the evaluation of the damage evolution in metallic materials subjected to cyclic loading

使用伽玛磁测试方法评估循环载荷下金属材料的损伤演变

• 批准号: 440056409
• 负责人: Professor Dr.-Ing. Peter Starke
• 金额: --
• 依托单位: Fachgebiet Werkstoffkunde und Werkstoffprüfung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/440056409?language=en
• 关键词: Use; gamma; magnetic; test; methods

In order to achieve the goal of a (residual) fatigue life calculation for metallic materials or structures, it is necessary that comprehensive information is determined and made available. This information describes the microstructure and the associated material mechanisms, whereby their non-destructive determination is an essential aspect, especially for components in service. In addition to external and internal loads and strains, it is the chemical composition and the material’s condition in particular that define and ultimately limit the residual service life. Using conventional analytical methods, these influencing factors can usually only be measured destructively. In principle, magnetic measuring methods are able to detect microstructural differences in metallic materials, which has been proven by numerous investigations in the past. However, so far this evaluation could only be carried out qualitatively, which inevitably requires further systematic investigations as calibration for a quantitative characterization. This is where the planned project comes in and is intended to make a further contribution to the improvement of magnetic measuring methods within the framework of (residual) fatigue life calculation as well as estimation methods for metallic materials. Within the investigations on the unalloyed and low-alloyed carbon steels C22R (SAE 1023) and 20MnCrS5 (SAE 5120), the magnetic property-stress-microstructure relationship is to be developed and made usable for the evaluation by means of magnetic measuring procedures. The two materials intended for the investigations have comparable chemical compositions which differ significantly only in manganese and chromium content. In addition, the influence of the condition of the material as a result of heat treatments as well as the load due to superimposed mean stresses will be investigated.These parameters to be developed will be integrated into the StressLife fatigue life calculation method and finally validated on the above-mentioned investigated materials. In addition to the characterization of fatigue behavior by means of stress-strain hysteresis measurement as well as thermometry and resistometry, the Barkhausen noise in particular will be used as a µmagnetic method and parameters describing the microstructure will be derived by means of a signal analysis. Prior investigations show that methods based on µmagnetics can in principle be used to characterize the fatigue behavior. For further quantification of the results in the context of a fatigue life calculation, however, systematic investigations of the measuring phenomena and the material mechanisms behind them are necessary.

为了实现金属材料或结构（残留）疲劳寿命计算的目标，有必要确定并提供全面的信息。该信息描述了微观结构和相关的材料机制，因此它们的非破坏性确定是一个必不可少的方面，尤其是对于服务组件而言。除了外部和内部负载和应变外，尤其是材料的状况以及最终限制了剩余使用寿命的是化学成分，尤其是材料的状况。使用常规的分析方法，这些影响因素通常只能被破坏性地测量。原则上，磁性测量方法能够检测金属材料的微观结构差异，过去许多投资证明了金属材料。但是，到目前为止，该评估只能公平地进行，这不可避免地需要进一步的系统投资作为定量表征的校准。这是计划中的项目进入的地方，旨在为改善（残留）疲劳寿命计算以及金属材料的估计方法做出进一步的贡献。在对非合金和低合金钢钢C22R（SAE 1023）和20MNCRS5（SAE 5120）的调查中，将开发磁性属性触感 - 微观结构关系，并可通过磁性测量程序进行评估。用于研究的两种材料具有可比的化学成分，仅在锰和铬含量中显着不同。此外，将研究由于热处理以及叠加平均应力引起的载荷的材料状况的影响。这些参数将被整合到压力生活疲劳寿命计算方法中，并最终在上述研究的材料上验证。除了通过应力 - 应变性肌动质测量以及温度计和电阻来表征疲劳行为外，尤其还将使用Barkhausen噪声作为µMAGNETIC方法，描述微结构的参数将通过信号分析来得出。先前的研究表明，基于µmagnetics的方法原则上可以用来表征疲劳行为。但是，对于疲劳寿命计算的背景下，必须进行测量现象及其背后的物质机制的系统研究。