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Es wird der DIN-Arbeitsausschuss Ermüdungsprüfung und seine Aufgaben vorgestellt. Ferner wird über die Thematik der thermischen Drift von Extensometern und die daraus resultierenden Fehler berichtet. Darüber hinaus werden aktuelle Aspekte der dynamischen Temperaturmessung im thermo-mechanischen Ermüdungsversuch vorgestellt.
Investigations on the tensile testing procedure conducted within the European project TENSTAND
(2015)
The current presentation shows the intention of the former European TENSTAND project on computer controlled tensile testing of metals. The history of the tensile testing standards is explained. Some test results of the TENSTAND project are shown. The presentation is focused on criticism of Chinese delegates in ISO TC 164 SC1 WG4 who stated that the TENSTAND project which was finished about 10 years ago came to wrong conclusions and were misleading. This presentation points out misunderstandings of the Chinese delegation in the test program and the results of the TENSTAND project and the former development of the tensile testing standard ISO 6892-1. Some tests of the TENSTAND project were newly evaluated using the original test data. The evaluation showed again that the conclusions of the TENSTAND project are correct.
In dem Vortrag werden aktuelle Entwicklungen zum thermo-mechanischen Ermüdungsversuch aufgezeigt. In der Vergangenheit wurden ausschließlich dehnungsgeregelte TMF-Versuche durchgeführt. Zukünftig werden auch spannungsgeregelte TMF-Versuche eine Rolle spielen, besonders bei kleinen Belastungen und hohen Schwingspielzahlen. Daneben werden Rissfortschrittsmessungen bei TMF-Beanspruchung eine zunehmende Bedeutung zugemessen. Die Versuchstechnik hierzu ist noch nicht sehr verbreitet verfügbar und ist sehr anspruchsvoll. Es wird das Europäische Forschungsprojekt TEACH vorgestellt, welches beantragt, aber noch nicht bewilligt ist. Ferner wird der 3rd TMF-Workshop 2016 angekündigt, der bei der BAM in Berlin stattfinden wird.
Tensile testing according to EN 10002-1 is one of the basic mechanical tests to characterise the mechanical properties of metallic materials. This testing procedure has been regularly under development for many decades in order to modify and amend it and to bring it up to an up to date standard. Today tensile testing for quality control in metals manufacturing industry is routinely performed automatically with computer controlled testing machines. Due to economical needs of industry proposals were made by a European Standard Committee to amend the standard EN 10002-1. A European research project with the acronym TENSTAND was started to validate the proposed modifications of the tensile testing standard. The work package 4 of the project was to validate the machine control characteristics. A comparison test program was started with ten partners, 4 test piece geometries and 3 test parameters for 6 materials, partly with upper and lower yield strength and partly with 0.2 % proof strength to compare experimental results according to the proposal to modify the standard EN 10002-1. Initially testing in the strain control mode was introduced as well as switching of the control mode to crosshead control 1 and switching of the testing speed at appropriate points during the test. The comparison test was evaluated statistically and scientifically. The following conclusions were derived from the comparison test and summarised as recommendations to the standard committees. The scatter of the material properties were not significantly reduced by introducing the amended testing procedure. Few of the reasons for the continuously observed scattercan be identified as follows: The material properties are observed to be widely dependent on the testing speed. As a consequence the range for the allowed testing speed must be reduced. The closed loop control was not optimised sufficiently in some tests, the use of complicated testing machine software led to misinterpretation of software commands, individual testing equipment and implementation of the tensile testing procedure led also to scatter of the material properties which lay in a range of few percent. This is blurred by the inhomogeneity of the material.