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TECHNICAL PAPERS

A Practical Formulation for Evaluating Combined Fatigue Damage From High- and Low-Frequency Loads

[+] Author and Article Information
Wenbo Huang

Centre for Ships and Ocean Structures, Norwegian University of Science and Technology, Trondheim 7491, Norwaywenbo.huang@ntnu.no

Torgeir Moan

Centre for Ships and Ocean Structures, Norwegian University of Science and Technology, Trondheim 7491, Norwaytorgeir.moan@marin.ntnu.no

J. Offshore Mech. Arct. Eng 129(1), 1-8 (Aug 10, 2006) (8 pages) doi:10.1115/1.2426999 History: Received April 04, 2006; Revised August 10, 2006

Based on Gaussian load processes, a new formula suitable for evaluating the combined fatigue damage due to high- and low-frequency loads is derived. Then, by using of the Winterstein’s transformation, the developed formula is extended for the combination of non-Gaussian loads. The numerical simulation shows that the predicted damage by the derived formula is very simple to use and close to the rain-flow prediction.

Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Combination of wave and low-frequency Gaussian loads

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Figure 2

Combination of wave and high-frequency Gaussian loads

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Figure 3

Combination of wave and low-frequency Gaussian loads

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Figure 4

Combination of wave and high-frequency Gaussian loads

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Figure 5

Combination of wave and low-frequency Gaussian loads

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Figure 6

Combination of wave and high-frequency Gaussian loads

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Figure 7

Combination of wave and low-frequency non-Gaussian loads

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Figure 8

Combination of wave and high-frequency non-Gaussian loads

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Figure 9

Combination of wave and low-frequency non-Gaussian loads

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Figure 10

Combination of wave and high-frequency non-Gaussian loads

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Figure 11

Combination of wave and low-frequency non-Gaussian loads

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Figure 12

Combination of wave and high-frequency non-Gaussian loads

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Figure 13

Combination of wave and low-frequency non-Gaussian loads

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Figure 14

Combination of wave and high-frequency non-Gaussian loads

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Figure 15

Combination of wave and low-frequency non-Gaussian loads

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Figure 18

Combination of wave and high-frequency non-Gaussian loads

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Figure 17

Combination of wave and low-frequency non-Gaussian loads

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Figure 16

Combination of wave and high-frequency non-Gaussian loads

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