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Cyclic plastic deformation tests to verify FEM-based shakedown analyses

  • Fatigue analyses are conducted with the aim of verifying that thermal ratcheting is limited. To this end it is important to make a clear distintion between the shakedown range and the ratcheting range (continuing deformation). As part of an EU-supported research project, experiments were carried out using a 4-bar model. The experiment comprised a water-cooled internal tube, and three insulated heatable outer test bars. The system was subjected to alternating axial forces, superimposed with alternating temperatures at the outer bars. The test parameters were partly selected on the basis of previous shakedown analyses. During the test, temperatures and strains were measured as a function of time. The loads and the resulting stresses were confirmed on an ongoing basis during performance of the test, and after it. Different material models were applied for this incremental elasto-plastic analysis using the ANSYS program. The results of the simulation are used to verify the FEM-based shakedown analysis.

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Author:Manfred Staat
Document Type:Article
Year of Completion:2001
Publishing Institution:Fachhochschule Aachen
Date of the Publication (Server):2005/11/23
fatigue analyses; shakedown analyses; thermal ratcheting
GND Keyword:Materialermüdung; Einspielen <Werkstoff>
Source:Nuclear Engineering and Design 206 (2001), Seite 235–247 ; http://dx.doi.org/10.1016/S0029-5493(00)00438-6
Institutes:FH Aachen / Fachbereich Medizintechnik und Technomathematik
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 60 Technik / 600 Technik, Technologie