Fatigue assessment by spectral approach for the ISSC comparative study of the hatch cover bearing pad

Timo Kukkanen (Corresponding Author), Timo P.J. Mikkola

Research output: Contribution to journalArticleScientificpeer-review

22 Citations (Scopus)

Abstract

Fatigue analyses were carried out using a spectral approach in the ISSC comparative study of the hatch cover-bearing pad (Marine Struct 15 (2001) 1; 14th International Ship & Offshore Structures Congress, Nagasaki, Japan, 2000). The predicted fatigue life was 5.3 years for the structural detail. For the same detail, the fatigue life predictions of the classification societies were between 2 and 21 years (Marine Struct 15 (2001) 1; 14th International Ship & Offshore Structures Congress, Nagasaki, Japan, 2000). In addition, several parameter variations were applied in the present study using various sea areas, speeds and three different models for the fatigue strength. The predicted fatigue lives varied from 3 to 6 years. In the results of the spectral analyses, clear differences in fatigue lives were observed between moderate and severe sea areas. This also indicates that defining the environmental conditions of the ship, i.e., sea areas and occurrence probabilities of different sea states, is important in addition to the operational profile of the ship. The predicted fatigue lives are short for the analysed detail. If the true fatigue life is over 20 years, the study indicates that the fatigue strength or the fatigue loading models underestimate the fatigue life. The methodologies in fatigue analysis include rather significant uncertainties, especially in defining the fatigue loading.
Original languageEnglish
Pages (from-to)75 - 90
Number of pages16
JournalMarine Structures
Volume17
Issue number1
DOIs
Publication statusPublished - 2004
MoE publication typeA1 Journal article-refereed

Fingerprint

Hatch covers
Bearing pads
Fatigue of materials
Ships
Offshore structures

Keywords

  • fatigue
  • fatigue life predictions
  • wave loads
  • spectral methods

Cite this

Kukkanen, Timo ; Mikkola, Timo P.J. / Fatigue assessment by spectral approach for the ISSC comparative study of the hatch cover bearing pad. In: Marine Structures. 2004 ; Vol. 17, No. 1. pp. 75 - 90.
@article{91109ae527da43fbaf3be1969d15d504,
title = "Fatigue assessment by spectral approach for the ISSC comparative study of the hatch cover bearing pad",
abstract = "Fatigue analyses were carried out using a spectral approach in the ISSC comparative study of the hatch cover-bearing pad (Marine Struct 15 (2001) 1; 14th International Ship & Offshore Structures Congress, Nagasaki, Japan, 2000). The predicted fatigue life was 5.3 years for the structural detail. For the same detail, the fatigue life predictions of the classification societies were between 2 and 21 years (Marine Struct 15 (2001) 1; 14th International Ship & Offshore Structures Congress, Nagasaki, Japan, 2000). In addition, several parameter variations were applied in the present study using various sea areas, speeds and three different models for the fatigue strength. The predicted fatigue lives varied from 3 to 6 years. In the results of the spectral analyses, clear differences in fatigue lives were observed between moderate and severe sea areas. This also indicates that defining the environmental conditions of the ship, i.e., sea areas and occurrence probabilities of different sea states, is important in addition to the operational profile of the ship. The predicted fatigue lives are short for the analysed detail. If the true fatigue life is over 20 years, the study indicates that the fatigue strength or the fatigue loading models underestimate the fatigue life. The methodologies in fatigue analysis include rather significant uncertainties, especially in defining the fatigue loading.",
keywords = "fatigue, fatigue life predictions, wave loads, spectral methods",
author = "Timo Kukkanen and Mikkola, {Timo P.J.}",
year = "2004",
doi = "10.1016/j.marstruc.2004.04.001",
language = "English",
volume = "17",
pages = "75 -- 90",
journal = "Marine Structures",
issn = "0951-8339",
publisher = "Elsevier",
number = "1",

}

Fatigue assessment by spectral approach for the ISSC comparative study of the hatch cover bearing pad. / Kukkanen, Timo (Corresponding Author); Mikkola, Timo P.J.

In: Marine Structures, Vol. 17, No. 1, 2004, p. 75 - 90.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Fatigue assessment by spectral approach for the ISSC comparative study of the hatch cover bearing pad

AU - Kukkanen, Timo

AU - Mikkola, Timo P.J.

PY - 2004

Y1 - 2004

N2 - Fatigue analyses were carried out using a spectral approach in the ISSC comparative study of the hatch cover-bearing pad (Marine Struct 15 (2001) 1; 14th International Ship & Offshore Structures Congress, Nagasaki, Japan, 2000). The predicted fatigue life was 5.3 years for the structural detail. For the same detail, the fatigue life predictions of the classification societies were between 2 and 21 years (Marine Struct 15 (2001) 1; 14th International Ship & Offshore Structures Congress, Nagasaki, Japan, 2000). In addition, several parameter variations were applied in the present study using various sea areas, speeds and three different models for the fatigue strength. The predicted fatigue lives varied from 3 to 6 years. In the results of the spectral analyses, clear differences in fatigue lives were observed between moderate and severe sea areas. This also indicates that defining the environmental conditions of the ship, i.e., sea areas and occurrence probabilities of different sea states, is important in addition to the operational profile of the ship. The predicted fatigue lives are short for the analysed detail. If the true fatigue life is over 20 years, the study indicates that the fatigue strength or the fatigue loading models underestimate the fatigue life. The methodologies in fatigue analysis include rather significant uncertainties, especially in defining the fatigue loading.

AB - Fatigue analyses were carried out using a spectral approach in the ISSC comparative study of the hatch cover-bearing pad (Marine Struct 15 (2001) 1; 14th International Ship & Offshore Structures Congress, Nagasaki, Japan, 2000). The predicted fatigue life was 5.3 years for the structural detail. For the same detail, the fatigue life predictions of the classification societies were between 2 and 21 years (Marine Struct 15 (2001) 1; 14th International Ship & Offshore Structures Congress, Nagasaki, Japan, 2000). In addition, several parameter variations were applied in the present study using various sea areas, speeds and three different models for the fatigue strength. The predicted fatigue lives varied from 3 to 6 years. In the results of the spectral analyses, clear differences in fatigue lives were observed between moderate and severe sea areas. This also indicates that defining the environmental conditions of the ship, i.e., sea areas and occurrence probabilities of different sea states, is important in addition to the operational profile of the ship. The predicted fatigue lives are short for the analysed detail. If the true fatigue life is over 20 years, the study indicates that the fatigue strength or the fatigue loading models underestimate the fatigue life. The methodologies in fatigue analysis include rather significant uncertainties, especially in defining the fatigue loading.

KW - fatigue

KW - fatigue life predictions

KW - wave loads

KW - spectral methods

U2 - 10.1016/j.marstruc.2004.04.001

DO - 10.1016/j.marstruc.2004.04.001

M3 - Article

VL - 17

SP - 75

EP - 90

JO - Marine Structures

JF - Marine Structures

SN - 0951-8339

IS - 1

ER -