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The generation of fatigue data for the longer fatigue lives of large scale components is troublesome, time consuming and expensive. Application of a fracture mechanics approach may help to bypass the difficulties and restrictions. As a further development of the fracture mechanics approach, a step-by-step procedure has been performed for specimens with an increasing degree of geometrical complexity. Experimental and analytical work has been carried out with regard to the fatigue behaviour of two dimensional geometries with an edge crack, and of three dimensional geometries with a semi-elliptical surface crack. Some of the geometries were provided with a weld shape exactly like a T-shape specimen with a full penetration weld. However, all the specimens were manufactured out of one thick plate by machining, so no weld irregularities were present in the specimens. All experiments were carried out in four point bending. The Paris-Erdogan relation was used as a crack growth model. For the specimens with a simple geometry a relatively good agreement is found between calculation and experiment. However, the analytical lifetime underestimates the experimental lifetime. With regard to the growth of surface cracks in plates with a weld geometry, the agreement between calculation and experiment was rather poor.

Additional information

Authors: SCHOLTE H G (EDITOR), Delft University of Technology, Ship Structures Laboratory (NL)
Bibliographic Reference: EUR 13395 EN (1992) Vol. 3, 270 pp., FS, ECU 22.50
Availability: (2)
ISBN: ISBN 92-826-3625-9
Record Number: 199210351 / Last updated on: 1994-12-02
Original language: en
Available languages: en