TY - CONF A1 - Griepentrog, Michael T1 - Bestimmung der Messunsicherheit bei der instrumentierten Eindringprüfung N2 - In der DIN EN ISO 14577 Metallische Werkstoffe – Instrumentierte Eindringprüfung zur Bestimmung der Härte und anderer Werkstoffparameter sind die Durchführung und Auswertung des Verfahrens, sowie die Kalibrierung der zu verwendenden Prüfmaschine genormt. In dieser Norm werden auch grundsätzliche Aussagen zur Bestimmung der Messunsicherheit gemacht. An Beispielen aus der täglichen Prüfpraxis werden verschiedene Möglichkeiten, aber auch die Grenzen der Bestimmung der Messunsicherheitbei der Instrumentierten Eindringprüfung beschrieben und kritisch diskutiert. T2 - 3. Zwick Roell Symposium –Nanoindentation CY - Ulm, Germany DA - 04.07.2019 KW - ISO 14577 KW - Instrumentierte Eindringprüfung KW - Bestimmung der Messunsicherheit PY - 2019 AN - OPUS4-48431 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Griepentrog, Michael T1 - Instrumented Indentation Testing (IIT) - A critical journey from the very first steps to the modern state of the art N2 - Nowadays the Instrumented Indentation Testing (IIT), in the nano range often named as nano indention, is one of the most commonly used methods to determine the mechanical properties of materials in the micro and nano range. This method is already extensive standardized in DIN EN ISO 14577 part 1-4. In the past, the application of this standard in testing praxis shows that the established values have an excellent precision. On the other side, the trueness as comparability of obtained results with reference values is not so good. To improve accuracy of IIT the use of a variable ε and the consideration of the lateral displacement during indentation became normative requirements during the last revision of ISO 14577. Starting with the beginning of instrumented indentation testing in 1898 the historical background and the main assumption of the Oliver and Pharr method will be explained and critical discussed. It will be shown how to apply the use of a variable ε and the consideration of the lateral displacement during indentation in the daily testing work to improve accuracy of IIT. Finally, ongoing standardization projects in the field of IIT will be briefly presented. T2 - Advanced nano-mechanical techniques for academic and industrial research. MML Conference and Workshop CY - Warwick, UK DA - 13.12.2017 KW - ISO 14577 KW - Instrumented Indentation Testing KW - Nanoindentation KW - IIT KW - Mechanical properties KW - Variable epsilon KW - Lateral displacement PY - 2017 AN - OPUS4-43466 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Griepentrog, Michael T1 - Dynamic instrumented indentation test application and standardisation N2 - The draft of part 5 of ISO 14577 specifies verification and calibration of testing machines for carrying out the measurement of the dynamic material response when an oscillatory force or displacement, with amplitudes small in comparison to the prescribed target values, is imparted to the indenter while the indenter is continuously loaded to a prescribed target load or target depth or while the load or displacement is held constant at a prescribed target value. In case of a material showing plastic-elastic behavior, the measured dynamic response is used for continuous evaluation of the dynamic stiffness of the contact as a function of depth and frequency. Using the dynamic stiffness of the contact a reduced dynamic modulus will be calculated. In case of a material showing visco-elastic behavior from the measured dynamic response also the dynamic contact damping coefficient as function of depth and frequency is evaluated continuously. Using dynamic contact stiffness and dynamic contact damping coefficient reduced lost and storage modulus for visco-elastic materials will be calculated. The main normative requirements of the draft are discussed and their applications are illustrated by examples from daily experimental praxis. T2 - 13th Conference on Local Mechanical Properties CY - Košice, Slovak Republic DA - 06.11.2017 KW - ISO 14577 KW - Instrumented indentation testing KW - Nanoindentation KW - IIT KW - Mechanical properties KW - Dynamic testing KW - Visco-elastic KW - Loss modul KW - Storage modul PY - 2017 AN - OPUS4-43468 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Griepentrog, Michael T1 - Towards the standardization of dynamic instrumented indentation testing N2 - Nowadays the Instrumented Indentation Testing (IIT) is one of the most commonly used methods to determine the mechanical properties of materials in the nano range. This method is already extensive standardized in EN ISO 14577 part 1-4. Because of the great interest of researchers and industries in investigations of time depending material behavior mostly all suppliers of IIT equipment are offering the possibility of dynamic testing. Realizing this development ISO/TC 164/SC3 Hardness Testing has proposed to start the new standardization project “Linear elastic dynamic instrumented indentation testing DIIT”. The development of this standard is accompanied by the first international intercomparing exercise comparing results of dynamic instrumented indentation testing from testing machines using different hardware solutions and different models for data evaluation. The draft of part 5 of ISO 14577 “Linear elastic dynamic instrumented indentation testing DIIT” specifies verification and calibration of testing machines for carrying out the measurement of the dynamic material response when an oscillatory force or displacement, with amplitudes small in comparison to the prescribed target values, is imparted to the indenter while the indenter is continuously loaded to a prescribed target load or target depth or while the load or displacement is held constant at a prescribed target value. In case of a material showing plastic-elastic behavior, the measured dynamic response is used for continuous evaluation of the dynamic stiffness of the contact as a function of depth and frequency. Using the dynamic stiffness of the contact a reduced dynamic modulus will be calculated. In case of a material showing visco-elastic behavior from the measured dynamic response also the dynamic contact damping coefficient as function of depth and frequency is evaluated continuously. Using dynamic contact stiffness and dynamic contact damping coefficient reduced lost and storage modulus for visco-elastic materials will be calculated. The main normative requirements of the draft will be presented and discussed in the light of the first results of the intercomparing excise. T2 - IIW6, International Indentation Workshop 6 CY - Sapporo, Japan DA - 02.07.2018 KW - ISO 14577 KW - Instrumented indentation testing KW - Nanoindentation KW - IIT KW - Mechanical properties KW - Dynamic testing KW - Visco-elastic KW - Loss module KW - Storage module PY - 2018 AN - OPUS4-45850 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -