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Vorträge und Posterpräsentationen (mit Tagungsband-Eintrag):

F. Loibnegger, H. P. Rossmanith, R. Huber:
"A THERMO-MECHANICAL MODEL FOR FATIGUE FRACTURE DUE TO REPEATED BRAKING OF MACHINE COMPONENTS";
Vortrag: 16th European Conference of Fracture (ECF 16), Alexandroupolis, Greece; 03.07.2006 - 07.07.2006; in: "Fracture of Nano and Enginnering Materials an Structures", E. E. Gdoutos (Hrg.); Springer, (2006), ISBN: 1-4020-4971-4; Paper-Nr. 34.



Kurzfassung englisch:
This contribution presents a hybrid analytical-numerical treatment of the thermo-mechanical model for the fatigue fracture mechanics analysis of the braking process of rotating machine parts such as wheels, etc. These machine parts have the shapes of thick disks and are weakened by small surface flaws. The disks are repeatedly frictionally disk-braked at random sequences of time instants. As the loading is rather severe, the stresses during braking and subsequent cooling do reach the plastic limits in compression and tension, respectively. Hence, the loading may cause conditions similar to those encountered in shake-down phenomena. It will be shown that for a locally heated and cooled heavy disk the thermo-mechanical loading and unloading cycles lead to changing material properties. These changes have been taken into account in the models described.

Schlagworte:
Braking; Rotating disk; Stress field; Fracture mechanics analysis; Fatique crack propagation; Live time calculation

Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.