Fretting Fatigue Life Extension for Single Crystal Ni-Based Superalloy by Applying Optimized Surface Texturing

The existing S-N curves by effective notch stress to assess the fatigue life of gusset welded joints can result in reduced accuracy due to the oversimplification of bead geometries. The present work proposes the parametric formulae of stress concentration factor (SCF) for as-welded gusset joints based on the spline model, by which the effective notch stress can be accurately calculated for fatigue resistance assessment. The spline model is also modified to make it applicable to the additional weld. The fatigue resistance of as-welded and additional-welded specimens is assessed considering the geometric effects and weld profiles. The results show that the error of SCFs by the proposed formulae is proven to be smaller than 5%. The additional weld can increase the fatigue life by as great as 9.4 times, mainly because the increasing weld toe radius and weld leg length lead to the smaller SCF. The proposed series of S-N curves, considering different SCFs, can be used to assess the welded joints with various geometric parameters and weld profiles.

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Fretting fatigue life assessment of overhead conductors using a clamp/conductor numerical model and biaxial fretting fatigue tests on individual wires

Fatigue & Fracture of Engineering Materials & Structures ◽

10.1111/ffe.13444 ◽

2021 ◽

Author(s):

Amine Omrani ◽

Sebastien Langlois ◽

Pierre Van Dyke ◽

Sebastien Lalonde ◽

Sasan Sattarpanah Karganroudi ◽

...

Keyword(s):

Fatigue Life ◽

Numerical Model ◽

Fretting Fatigue ◽

Fatigue Tests ◽

Life Assessment ◽

Fatigue Life Assessment

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Fretting fatigue of single crystal/polycrystalline nickel subjected to blade/disk contact loading

Acta Astronautica ◽

10.1016/j.actaastro.2004.11.007 ◽

2005 ◽

Vol 57 (1) ◽

pp. 1-9 ◽

Cited By ~ 12

Author(s):

H. Murthy ◽

Daniel B. Garcia ◽

John F. Matlik ◽

Thomas N. Farris

Keyword(s):

Single Crystal ◽

Fretting Fatigue ◽

Polycrystalline Nickel ◽

Contact Loading ◽

Disk Contact

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Effect of misorientation on the fatigue life of nickel-base single crystal superalloy DD5 at 980°C

International Journal of Fatigue ◽

10.1016/j.ijfatigue.2021.106479 ◽

2021 ◽

pp. 106479

Author(s):

Piao Li ◽

Wen Jiang ◽

Shao-Shi Rui ◽

Wei-xing Yao ◽

Hui-ji Shi ◽

...

Keyword(s):

Fatigue Life ◽

Single Crystal ◽

Single Crystal Superalloy ◽

Nickel Base

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Influence of Wear Properties on Fretting Fatigue Life of a CK45 Alloy and the Al7175 Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.587-588.971 ◽

2008 ◽

Vol 587-588 ◽

pp. 971-975 ◽

Cited By ~ 1

Author(s):

M. Buciumeanu ◽

A.S. Miranda ◽

F.S. Silva

Keyword(s):

Wear Resistance ◽

Fatigue Life ◽

Material Properties ◽

Fatigue Behavior ◽

Synergetic Effect ◽

Fretting Fatigue ◽

Reduction Factor ◽

Strength Reduction ◽

Strength Reduction Factor ◽

Wear Properties

The main objective of this work was to study the influence of the wear properties of two commercial alloys (CK45 and Al7175) on their fretting fatigue behavior. It is verified the effect of material local degradation by wear on a fatigue strength reduction factor, namely the stress concentration factor, and on the overall fretting fatigue life of these materials. The fretting fatigue phenomenon is a synergetic effect between wear and fatigue. It is dependent on both the fatigue and the wear properties of the materials. Material properties promoting an increase in wear resistance should enhance fretting fatigue life.

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