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Weight functions and Stress Intensity Magnification factors for elliptical and semi-elliptical cracks under variable normal stress – Part II

✍ Scribed by Dipl.-Ing. W. Huget; Dipl.-Ing. T. Reddemann; Dr.-Ing. L. Grüter


Publisher
John Wiley and Sons
Year
1984
Tongue
English
Weight
344 KB
Volume
15
Category
Article
ISSN
0933-5137

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✦ Synopsis


Surface. cracks under peak stresses are investigated. The calculational procedure is based on the general form of the weight function for an elliptical crack embedded in an infinite solid. Two points on the contour of the ellipse are investigated. A new correction procedure for transfer from the embedded crack to surface crack configurations is presented, which is valid for all ah-values. Weight functions for both points have been found with the crack aspect ratio a/c as parameter.

For the point at the end of the minor axis all weight functions for embedded cracks are describable by one equation only (using Heuman's lambda function). For various dc-ratios of the surface crack under different stress distributions the stress intensity magnification factors are given.

Gewichtsfunktionen und

SpannungsintensitiitsvergroBerungsfaktoren fur elliptische und halbelliptische Fehler unter beliebiger Normalspannung -Teil II Oberflachenfehler unter Spitzenspannungen werden untersucht. Das Berechnungsverfahren basiert auf der allgemeinen Form der Gewichtsfunktion fiir einen elliptischen Fehler in einem unendlichen Korper. Zwei Punkte auf der Ellipsenkontur werden untersucht. Ein neues, fur alle dt-Werte gultiges Korrekturverfahren fiir die Ubertragung vom eingebetteten auf den Oberflachenfehler wird vorgestellt. Gewichtsfunktionen fiir beide Punkte mit dem Halbachsenverhaltnis a/c als Parameter werden gefunden. Im Falle des Endpunktes der kleineren Achse sind alle Gewichtsfunktionen durch eine Gleichung beschreibbar (Lambda-Funktion von Heuman). Die Spannungsintensitatsvergroflerungsfaktoren fur verschiedene dc-Werte des Obefflachenfehlers werden bei verschiedenen Spannungsverteilungen angegeben.


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