Fatigue strength determination of ship structural joints

Kozak, Janusz; Górski, Zbigniew

doi:10.2478/v10012-011-0009-8

Cited by 9 publications

(8 citation statements)

References 10 publications

(14 reference statements)

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“…The above guidelines do not define the number of the applied load levels, they only refer to the standard ASTM [6] which gives the relation for the replication percent: (1) where:…”

Section: Number Of Tested Specimensmentioning

confidence: 99%

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Comparing Guidelines Concerning Construction of the S-N Curve within Limited Fatigue Life Range

Strzelecki

Sempruch

Nowicki

2015

Polish Maritime Research

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The article collates guidelines concerning experimental construction of the S-N fatigue curves within a limited fatigue life range. An attempt is made to compare these guidelines, based on experimental data recorded during rotating bending of a notched specimen made of 42CrMo4. The recorded differences in fatigue life values between the constructed curves reach the maximum of 12.2%. According to the above guidelines, the number of tests in particular test series varies from 6 to 28. Based on the performed analysis a conclusion was made that the increase in the number of tests leads to the increase of accuracy but, on the other hand, remarkably increases the time of the experiment and

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“…The above guidelines do not define the number of the applied load levels, they only refer to the standard ASTM [6] which gives the relation for the replication percent: (1) where:…”

Section: Number Of Tested Specimensmentioning

confidence: 99%

“…When designing new structural elements which are expected to be exposed to time-dependent loads, such as for instance load-bearing parts of ship hulls, their fatigue strength curve is calculated for the assumed lifetime [1]. These calculations require the information on the S-N fatigue characteristic.…”

Section: Introductionmentioning

confidence: 99%

Comparing Guidelines Concerning Construction of the S-N Curve within Limited Fatigue Life Range

Strzelecki

Sempruch

Nowicki

2015

Polish Maritime Research

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“…The main causes of the failures are the following: corrosion wear, collisions with vessels, excessive operational loads, material defects, fatigue of materials, improper construction as well as workmanship [3][4][5][6]. It is usual practice to remove used or failed elements of pipelines and substitute them with new ones.…”

Section: Tab1 Grades Of Steels Applicable To Pipelines Acc Api 5l mentioning

confidence: 99%

Underwater Wet Repair Welding of API 5L X65M Pipeline Steel

Rogalski

Łabanowski

2017

Polish Maritime Research

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This paper presents results of the research of effect of polymer insulation of pipeline made of API 5L X65M steel as well as underwater wet welding parameters on properties of joints made by covered electrodes. Effect of heat input on structure and hardness of joints during repair of underwater pipeline was analyzed. Welding defects like microcracks, micro-lacks of fusion, slag inclusions, as well as HAZ hardness increase over an assumed acceptance criterion for welded joints in pipes without anticorrosion polymer insulation, were identified. A significant effect of polimer insulation on structure and properties of welded joints, was found.

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“…After adopting the value m0 = 277.0 MPa obtained from the Staircase method as the hypothetical fatigue limit and assuming the normal distribution of the fatigue limit N(277.0; 23.6), the zero hypothesis was formulated about equality of the fatigue limit obtained using the accelerated method m = 294.2 MPa in the form (1) against the alternative hypothesis…”

Section: Tab 3 Fatigue Limits For Particular Specimens In Acceleratmentioning

confidence: 99%

“…The nominal stress concept based fatigue analysis is a basic element of fatigue life evaluation of structural elements, including those composing ship structures [1]. An important component of this analysis is construction of the S-N (Wöhler) curve for the examined material or structural element, and the basic parameter of this curve, in turn, is the fatigue limit.…”

Section: Introductionmentioning

confidence: 99%