Fretting Fatigue Design of Subsea Connectors: A Generalised Approach to Testing

2020 ◽  
Author(s):  
H. Andresen ◽  
D. A. Hills ◽  
Anders Wormsen ◽  
K. A. Macdonald
Keyword(s):  
Crack Nucleation ◽  
Normal Load ◽  
Asymptotic Methods ◽  
Fretting Fatigue ◽  
Test Design ◽  
Frictional Contacts ◽  
Fatigue Design ◽  
Geometrical Features ◽  
Fatigue Data ◽  
Constant Normal Load

Abstract In this paper fretting fatigue is addressed as a potential design consideration for wellhead connectors. The study of near-edge relative motion for frictional contacts under constant normal load is described using analytical, numerical and asymptotic methods. Based on published fretting fatigue experimental data an argument is drawn for a generalised fretting fatigue test design. We do this by reducing the parameters responsible for crack nucleation to the smallest number possible and thereby revealing the fretting fatigue strength as a material property independent of geometrical features. Easy to apply recipes are described and thoughts on a potential apparatus are shared with the reader. Commercial potential lies in the wide-ranging applicability of experimental results across many prototypes and loadings once an appropriate amount of fretting fatigue data has been generated for the material in question.

Cracking Induced by Fretting of Aluminium Alloys

1997 ◽  
Vol 119 (1) ◽  
pp. 36-42 ◽  
Author(s):  
Z. R. Zhou ◽  
L. Vincent
Keyword(s):  
Aluminium Alloys ◽  
Small Amplitude ◽  
Crack Nucleation ◽  
Normal Load ◽  
Fatigue Cracking ◽  
Fretting Fatigue ◽  
Fretting Wear ◽  
Partial Slip ◽  
Material Loss ◽  
Main Effects

Fretting-wear and fretting-fatigue loadings can both result in wear (material loss) and in crack nucleation and propagation (fatigue process). This paper deals with cracking induced by small amplitude displacements in the case of aeronautic aluminium alloys. The two sets of fretting maps are introduced: running condition fretting map is composed of partial slip (sticking), mixed fretting and gross sliding regime; material response fretting map is associated with two macro-degradation modes. Crack nucleation and propagation are analysed for every fretting regime. The mixed fretting regime appeared most detrimental with regards to fatigue cracking. Slip amplitude and normal load main effects discussed for fretting wear can be used to justify the fatigue limit decrease often obtained for fretting fatigue experiments.

Asymptotic Methods Applied to the Correlation of Fretting Fatigue Lives

2005 ◽  
Author(s):  
David A. Hills ◽  
Christopher M. Churchman ◽  
Daniele Dini
Keyword(s):  
Asymptotic Methods ◽  
Fretting Fatigue ◽  
The State ◽  
Asymptotic Solutions ◽  
State Of Stress ◽  
Fatigue Data

Local or asymptotic states of stress relevant to the characterization of the state of stress adjacent to the edges of incomplete contacts are discussed. It is shown that the multipliers for the asymptotic solutions effectively characterize the nucleation propensity of the geometries. This idea is tested by applying the approach to reliable fretting fatigue data in the literature, and re-examining it in this light.

Frictional complete contacts subject to shear and bulk tension

2008 ◽  
Vol 222 (12) ◽  
pp. 2301-2309 ◽  
Author(s):  
N Banerjee ◽  
D Dini ◽  
D A Hills
Keyword(s):  
Normal Load ◽  
Cyclic Shear ◽  
Edge Angle ◽  
Subsequent Application ◽  
Constant Normal Load

This paper provides a set of ‘maps’ showing the response of three example frictional complete contacts (with edge angle of 60°, 90°, and 120°) subject to a constant normal load and the subsequent application of cyclic shear and bulk tension, the latter present in only one body. The maps define the region of full adhesion, the nature of violations, and conditions under which they arise.

A note on the crack analogue fretting fatigue model with varying normal load

2018 ◽  
Vol 229 (12) ◽  
pp. 4953-4961
Author(s):  
M. Ciavarella ◽  
Y. J. Ahn
Keyword(s):  
Normal Load ◽  
Fretting Fatigue ◽  
Fatigue Model

Rock joint modeling using a visco-plastic multilaminate model at constant normal load condition

2006 ◽  
Vol 24 (5) ◽  
pp. 1449-1468 ◽  
Author(s):  
Reza Mahin Roosta ◽  
Mohammad Hossein Sadaghiani ◽  
Ali Pak ◽  
Yaser Saleh
Keyword(s):  
Normal Load ◽  
Rock Joint ◽  
Load Condition ◽  
Joint Modeling ◽  
Constant Normal Load ◽  
Constant Normal Load Condition

Codes and Practice of Fatigue Design for Welded Structures

1999 ◽  
Author(s):  
Haruo Sakamoto
Keyword(s):  
Statistical Study ◽  
Welded Joint ◽  
Fatigue Testing ◽  
Fracture Probability ◽  
Structural Stress ◽  
Welded Structures ◽  
Testing Method ◽  
Japanese Industrial Standard ◽  
Fatigue Design ◽  
Fatigue Data

Abstract This paper describes the codes and practice for designing welded structures such as railroad truck frames. For designing the first configuration, rather simple criteria are desired, although most codes such as AWS. AISC, etc. are complex. They consist of a variety of welded joint categories, which make a designer feel uncomfortable when deciding the first configuration. Therefore, such codes are considered to be mainly used for the evaluation of designed and constructed structures, and not to be used for deciding the first configuration. The JIS (Japanese Industrial Standard) for a railroad truck frame is explained as an example of a simple code, and is compared with some fatigue data. This standard is thought to be useful for a designer. However, the result of this investigation suggests a modification of the JIS for obtaining more reasonable criteria. Desirable criteria should be simple for a designer and sufficiently safe for structures. Additional investigations on fatigue data of welded joints, a statistical study for desirable non-fracture probability, and methods of structural stress analysis are to be conducted in the future. A practical fatigue testing method is also needed for investigating the strength in a high cycle region such as 108.

On the Edge Singularity of an Actuator Disk with Large Constant Normal Load

1977 ◽  
Vol 21 (02) ◽  
pp. 125-131
Author(s):  
G. H. Schmidt ◽  
J. A. Sparenberg
Keyword(s):  
Potential Theory ◽  
Normal Load ◽  
Curved Surface ◽  
Singular Behavior ◽  
Nonlinear Potential Theory ◽  
Edge Singularity ◽  
Actuator Disk ◽  
Nonlinear Potential ◽  
Constant Normal Load ◽  
Special Case

In this paper some aspects of the nonlinear potential theory of actuator disks are considered. A rather general formulation of the problem for a prescribed load on a curved surface is given. For the special case of constant normal load and no incoming velocity the singular behavior of the flow at the edge of the disk is discussed.

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