Multiaxial Fatigue Assessment of Typical Fillet Welded Details: Nominal Stress Approach-based Simplified Formulae

Welded joints are widely employed in engineering field and they are always the starting points of fatigue damage. Because of the unfavorable material and geometry characters, as well as initial welding defects, the fatigue damage evaluation of welded joints is an important and troublesome issue for engineers. In this article, multiaxial fatigue space theory proposed by the first author for smooth specimens is extended for the fatigue damage assessment of welded joints, by adopting nominal stress approach. The fatigue test data with different materials, loading paths, and welded joints geometries are used to validate the capability of this theory. The result indicates a strong parallelization between predicted life and experimental life, with a favorable prediction error and beneficial error distribution. It can be concluded that multiaxial fatigue space theory is a useful method for fatigue damage assessment of welded joints with the help of nominal stress approach.

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Multiaxial fatigue assessment of jacket-supported offshore wind turbines considering multiple random correlated loads

Renewable Energy ◽

10.1016/j.renene.2021.01.093 ◽

2021 ◽

Vol 169 ◽

pp. 1252-1264

Author(s):

Chaoshuai Han ◽

Kun Liu ◽

Yongliang Ma ◽

Peijiang Qin ◽

Tao Zou

Keyword(s):

Wind Turbines ◽

Multiaxial Fatigue ◽

Offshore Wind ◽

Fatigue Assessment ◽

Offshore Wind Turbines

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Multiaxial fatigue assessment of friction stir welded tubular joints of Al 6082-T6

International Journal of Fatigue ◽

10.1016/j.ijfatigue.2016.08.010 ◽

2017 ◽

Vol 101 ◽

pp. 282-296 ◽

Cited By ~ 17

Author(s):

L. Susmel ◽

D.G. Hattingh ◽

M.N. James ◽

R. Tovo

Keyword(s):

Multiaxial Fatigue ◽

Fatigue Assessment ◽

Friction Stir ◽

Tubular Joints

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The elasto-plastic Point Method to estimate fatigue lifetime of notched metallic materials under variable amplitude multiaxial fatigue loading

MATEC Web of Conferences ◽

10.1051/matecconf/201930013004 ◽

2019 ◽

Vol 300 ◽

pp. 13004

Author(s):

Namiq Zuhair Faruq ◽

Luca Susmel

Keyword(s):

Biaxial Loading ◽

Fatigue Loading ◽

Medium Carbon Steel ◽

Multiaxial Fatigue ◽

Point Method ◽

Assessment Procedure ◽

Fatigue Lifetime ◽

Fatigue Assessment ◽

Variable Amplitude ◽

Strain Components

The present paper deals with the formulation and implementation of a novel fatigue lifetime estimation technique suitable for designing notched components against multiaxial fatigue. This fatigue assessment procedure was devised by combining the Modified Manson-Coffin Curve Method and the Shear Strain-Maximum Variance Method with the elasto-plastic Point Method. The accuracy of the approach being proposed was checked against a large number of experimental results that were generated by testing notched cylindrical samples of medium-carbon steel En8. These tests were run under proportional/non-proportional constant/variable amplitude biaxial loading, with the effect of non-zero mean stresses and different frequencies between the axial and torsional stress/strain components being also investigated. The results from this validation exercise demonstrate that the novel multiaxial fatigue assessment methodology being proposed is highly accurate, with its systematic usage resulting in predictions falling within an error factor of 2. This remarkable level of accuracy is very promising especially in light of the fact that this approach can be applied by directly post-processing the results from elasto-plastic Finite Element (FE) models solved using commercial codes.

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