SYMPOSIA PAPER Published: 01 January 2005
STP11320S

Study on Fatigue Design Loads for Ships Based on Crack Growth Analysis

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Although ship structural members are designed to survive 20 years, fatigue crack damage still occurs, often starting very early in the ship's life, with some cracks growing quickly to considerable size. The primary factor causing variability is the sequence of the variable amplitude load cycle, and the others are welding irregularities on the weld toe and variations in mechanical properties in the material. In this paper, the load sequence effect on fatigue life variability is examined by the use of a fatigue design procedure proposed by the authors. It is found that the fatigue lives of ship structural members vary from several months to 20 years, strongly dependent on the sequence of sea state which ships encounter during ocean-going service. The worst possible loading sequence is elucidated for the fatigue life of the ship's hull. Sensitivity study of fatigue life is discussed.

Author Information

Tomita, Y
Graduate School of Engineering, Osaka University, Suita, Osaka, Japan
Hashimoto, K
Graduate School of Engineering, Osaka University, Suita, Osaka, Japan
Osawa, N
Graduate School of Engineering, Osaka University, Suita, Osaka, Japan
Terai, K
Graduate School of Engineering, Osaka University, Suita, Osaka, Japan
Wang, Y
Graduate School of Engineering, Osaka University, Suita, Osaka, Japan
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Details
Developed by Committee: E08
Pages: 420–434
DOI: 10.1520/STP11320S
ISBN-EB: 978-0-8031-5503-9
ISBN-13: 978-0-8031-3479-9