Use of non-destructive testing methods in a new one-specimen test strategy for estimating fatigue data

在新的单样本测试策略中使用无损测试方法来估计疲劳数据

基本信息

批准号：
382879996
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：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/382879996?language=en
关键词：
Use non destructive testing methods

项目摘要

The aim of this research proposal is to use the potential of a non-destructive testing methods, the digitalisation of the measurement techniques as well as signal processing and to combine this with a new one-specimen test strategy in order to achieve a significant gain in information concerning the fatigue behaviour with a simultaneous reduction of experimental effort and costs. The result might be therefore not only a considerable advantage with respect to conventional determined S,N data, but also to established short-term procedures, if it is possible to separate several material effects by means of data analysis and to use this for fatigue life calculations based on the results of one single specimen.Within the new fatigue life calculation method SteBLife (Stepped Bar Fatigue Life Evaluation) a stepped specimen geometry with several gauge lengths is used in order to detect the local material responses through the application of different NDT techniques. First preliminary investigations for specimens from the steel C45E/SAE1045 have already shown very promising results. Within that investigations, the material response was measured by means of an infrared camera, which is to be intensified by additional thermocouple measurements in the framework of this research proposal and also extended to magnetic measurement methods. Contrary to the conventional approach, the specimens are to be magnetized not with electric or permanent magnets, but by means of an applied constant/alternating current or voltage to generate a specific microstructure related magnetic field. The measuring signals will be analysed in terms of specific features; in particular, the simulation of the measurement signals using commercial simulation software solutions like COMSOL might give a significant contribution to the understanding and interpretation of the results. The experimental investigations, simulations and signal analysis will be made on/for unalloyed and low alloyed carbon steels C20E, C45E and 42CrMo4 in normalized and one commercially available quenched and tempered condition each.

这项研究建议的目的是利用非破坏性测试方法的潜力，测量技术的数字化以及信号处理，并将其与新的单一特定测试策略相结合，以便在疲劳行为的信息中获得显着增长，并同时减少实验努力和成本。 The result might be therefore not only a considerable advantage with respect to conventional determined S,N data, but also to established short-term procedures, if it is possible to separate several material effects by means of data analysis and to use this for fatigue life calculations based on the results of one single specimen.Within the new fatigue life calculation method SteBLife (Stepped Bar Fatigue Life Evaluation) a stepped specimen geometry with several gauge lengths is used in order to通过应用不同的NDT技术来检测局部材料响应。来自钢C45E/SAE1045的标本的首次初步研究已经显示出非常有希望的结果。在该研究中，材料响应是通过红外摄像机测量的，红外摄像机将通过本研究建议的框架中的其他热电偶测量来加强，并扩展到磁性测量方法。与常规方法相反，标本应不用电气或永久磁体磁化，而是通过使用的常数/交流电流或电压来生成特定的微结构相关磁场。测量信号将根据特定特征进行分析；特别是，使用商业仿真软件解决方案（例如Comsol）对测量信号进行仿真可能会为对结果的理解和解释做出重大贡献。实验研究，模拟和信号分析将在非合金和低合金的碳钢C20E，C45E和42CRMO4上进行归一化和一个市售的淬火和脾气调整状态。