Das Verfahren der Amplituden‐Transformation zur Lebensdauerberechnung bei Schwingbeanspruchung

Abstract

Abriß der Problemstellung und verfügbare Verfahren der Lebensdauerberechnung bei Schwingbeanspruchung. Der Grundgedanke der Amplituden‐Transformation auf der Grundlage linearer Schadensakkumulation. Definition eines Schädigungskennwertes aus der Hystereseschleife der örtlichen Spannung und Dehnung im Kerbgrund. Erzielte Verbesserungen der Lebensdauervorhersage, veranschaulicht anhand von Beispielen.

Thermomechanical Fatigue Behavior of the Intermetallic γ-TiAl Alloy TNB-V5 with Different Microstructures

“…Among these, the damage parameter P HL by Haibach and Lehrke (Eq. [4]) [29] shows comparable correlations to the experimental fatigue lives; therefore, the quality of the resulting fatigue life predictions is nearly identical to that of P SWT . In Figure 10, the damage parameter P HL is plotted in a double-logarithmic diagram vs the fatigue lives for the same tests, as shown in Figure 9(a) (P SWT vs N F ) for the temperature ranges including 800°C as upper temperature.…”

Ermüdungsfestigkeit

“…Eine methodisch andersartige Weiterentwicklung der Schadensakkumulationsrechnung unter Berücksichtigung von Reihenfolgeeffekten stellt das "Verfahren der Amplitudentransformation" nach Haibach u. Lehrke [895,1633] dar. Es ist darauf angelegt, Ergebnisse herkömmlicher Schwingfestigkeitsforschung auf Basis der Nennspannungen mit den Erkenntnissen zur verbesserten Lebensdauerberechnung auf Basis der Kerbgrundbeanspruchungen zu verbinden.…”

Fatigue behaviour of 16Mo3 steel at elevated temperatures under uniaxial as well as biaxial‐planar loading

“…For a suitable lifetime prediction of both isothermal as well as thermo‐mechanical loading, several authors take the mean stress, the energy density, empirical damage parameters, and environmental effects into account . Recently, a new lifetime prediction equation derived from the damage parameter of Zamrik and Renauld was presented by the authors' group to describe uniaxial and biaxial isothermal as well as uniaxial thermo‐mechanical fatigue tests.…”

“…For a suitable lifetime prediction of both isothermal as well as thermo-mechanical loading, several authors take the mean stress, the energy density, empirical damage parameters, and environmental effects into account. [57][58][59][60][61] Recently, a new lifetime prediction equation derived from the damage parameter of Zamrik and Renauld 62 was presented by the authors' group 19,20,63 to describe uniaxial and biaxial isothermal as well as uniaxial thermo-mechanical fatigue tests. With this approach, it was possible to describe fatigue live data of the nickelbase superalloys IN738LC and Waspaloy 19,20,27 , respectively, for different temperatures and loading cases with a single stress-strain approach for each material.…”