Fatigue Life of TLP Flexelements

Gunderson, R.H.; Stevenson, A.; Harris, J. A.; Gahagan, P.; Chilton, T.S.

doi:10.4043/6898-ms

Cited by 3 publications

(1 citation statement)

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“…(1) where U is the stored elastic energy A is the area of new crack growth 1 denotes that the partial differentiation is performed at constant deformation (1) where U is the stored elastic energy A is the area of new crack growth 1 denotes that the partial differentiation is performed at constant deformation…”

Section: Fracture Mechanics Analysis Of Ram Powell Flexelementsmentioning

confidence: 99%

Ageing and Fatigue Life of Structural TLP Flexelements

Gunderson

Stevenson

1997

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This paper presents a methodology for estimating the fatigue life of elastomerlsteel flexelements that includes the effects of both mechanical fatigue loads and ageing of the elastomer. Previous methods calculated the rate of fatigue crack growth in the elastomer layers of flexelements using fracture mechanic analysis and a material fatigue model obtained from tests on new were taken into account, the calculated fatigue life ranges from 160 years to 400 years depending on the conservatism of the assumptions used. The effect of ageing is obviously significant. The analysis uses data generated from elastomer samples exposed to accelerated ageing conditions. A special purpose fracture mechanics program calculates the crack growth in each layer for each load in the yearly fatigue spectrum. The material properties are updated and total crack length is computed on a year-by-year basis until the failure criteria is reached.The present approach may remove some of the uncertainty associated with structural elastomer design, result in more realistic estimates of elastomer fatigue life, and may lead to the use of safety factors commonly associated with the design of more familiar structures.

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Section: Fracture Mechanics Analysis Of Ram Powell Flexelementsmentioning

confidence: 99%

Ageing and Fatigue Life of Structural TLP Flexelements

Gunderson

Stevenson

1997

All Days

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A literature survey on fatigue analysis approaches for rubber

Mars

Fatemi

2002

International Journal of Fatigue

416

255

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Modelling, simulation and experiment of the spherical flexible joint stiffness

Wang

Yao

et al. 2018

Mech. Sci.

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Abstract. The spherical flexible joint is extensively used in engineering. It is designed to provide flexibility in rotation while bearing vertical compression load. The linear rotational stiffness of the flexible joint is formulated. The rotational stiffness of the bonded rubber layer is related to inner radius, thickness and two edge angles. FEM is used to verify the analytical solution and analyze the stiffness. The Mooney-Rivlin, Neo Hooke and Yeoh constitutive models are used in the simulation. The experiment is taken to obtain the material coefficient and validate the analytical and FEM results. The Yeoh model can reflect the deformation trend more accurately, but the error in the nearly linear district is bigger than the Mooney-Rivlin model. The Mooney-Rivlin model can fit the test result very well and the analytical solution can also be used when the rubber deformation in the flexible joint is small. The increase of Poisson's ratio of the rubber layers will enhance the vertical compression stiffness but barely have effect on the rotational stiffness.

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Fatigue Life of TLP Flexelements

Cited by 3 publications

References 0 publications

Ageing and Fatigue Life of Structural TLP Flexelements

Ageing and Fatigue Life of Structural TLP Flexelements

A literature survey on fatigue analysis approaches for rubber

Modelling, simulation and experiment of the spherical flexible joint stiffness

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