Reply to comments on “initiation and propagation of fretting fatigue cracks”

The conversion of a 30-ft-dia test tank to a facility for subjecting large-scale models of submarine structural details to cyclic loading is described. By means of automatically controlled valves, models were subjected to a pressure variation simulating a submarine diving to its test depth and returning to the surface. The cyclic rate was slightly less than one per minute. The system was so designed that the test tank itself was not subjected to the pressure variations. Details of a series of models designed to simulate particular structural details of interest in recent submarine construction are described. Results of the tests to date are summarized, and several observations relative to the initiation and propagation of fatigue cracks in submarine structural details are presented.

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A coupled crack initiation and propagation numerical procedure for combined fretting wear and fretting fatigue lifetime assessment

Theoretical and Applied Fracture Mechanics ◽

10.1016/j.tafmec.2019.03.005 ◽

2019 ◽

Vol 101 ◽

pp. 294-305 ◽

Cited By ~ 8

Author(s):

I. Llavori ◽

A. Zabala ◽

M.A. Urchegui ◽

W. Tato ◽

X. Gómez

Keyword(s):

Crack Initiation ◽

Numerical Procedure ◽

Fretting Fatigue ◽

Fretting Wear ◽

Crack Initiation And Propagation ◽

Fatigue Lifetime ◽

Initiation And Propagation

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Kinetics and Mechanisms of Degradation of the Surface Layers of Gas-Turbine Engine Structural Components Under Cyclic Thermal Loading During Initiation and Propagation of Thermal Fatigue Cracks

Strength of Materials ◽

10.1007/s11223-017-9825-0 ◽

2016 ◽

Vol 48 (6) ◽

pp. 784-790 ◽

Cited By ~ 1

Author(s):

K. P. Buiskikh ◽

S. G. Kiselevskaya ◽

L. V. Kravchuk ◽

E. A. Zadvornyi ◽

N. N. Feofentov

Keyword(s):

Gas Turbine ◽

Thermal Fatigue ◽

Thermal Loading ◽

Fatigue Cracks ◽

Structural Components ◽

Surface Layers ◽

Turbine Engine ◽

Cyclic Thermal Loading ◽

Initiation And Propagation ◽

Thermal Fatigue Cracks

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Investigation of Residual Stresses in a Sleeve Coldworked Lug Specimen by Neutron and X-ray Diffraction

Advances in X-ray Analysis ◽

10.1154/s0376030800018103 ◽

1994 ◽

Vol 38 ◽

pp. 455-461

Author(s):

R. Lin ◽

B. Jaensson ◽

T. M. Holden ◽

R. B. Rogge ◽

J. H. Root

Keyword(s):

Fatigue Life ◽

Residual Stresses ◽

Fatigue Cracks ◽

Fatigue Properties ◽

Aircraft Industry ◽

X Ray Diffraction ◽

X Ray ◽

Initiation And Propagation ◽

Structural Parts ◽

Compressive Residual Stresses

Sleeve coldworking (SCW) is a mechanical process used in the aircraft industry to strengthen fastener holes of structural parts. By cold-expanding the holes, compressive residual stresses and a high dislocation density are introduced around the holes, the effect of which is to counteract the initiation and propagation of fatigue cracks and thus increase the fatigue life of the parts. The knowledge of residual stress due to SCW is therefore crucial for assessing the fatigue properties of a treated part. In this study, residual stresses were investigated, by employing neutron and X-ray diffraction methods, in a lug specimen that was sleeve coldworked and fatigued. The specimen had been used for testing the influence of the SCW process on fatigue life and crack propagation behaviour under constant amplitude or variable amplitude cyclic loading.

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