Paper XIV (iii) A low cycle fatigue wear model and its application to layered systems

The frictional force when a hard surface slides over a relatively soft one is explained as the force needed to push waves of plastically deformed material along the soft surface ahead of asperities on the hard one. Using plastic strain increments determined from the wave model and assuming that wear occurs as a result of low-cycle fatigue, predictions are made of wear which take account of the surface roughness and lubrication conditions and a comparison is made with experimental results. Metallographic results are given which support the assumption that low cycle fatigue is important in causing surface damage and hence wear. These results also show that ironing of the surface by the passage of waves leads to surface damage and wear. It is concluded that in future work account will have to be taken of both low-cycle fatigue and ironing in making wear predictions.

Download Full-text

Prediction of Archard's wear coefficient for metallic sliding friction assuming a low cycle fatigue wear mechanism

Wear ◽

10.1016/0043-1648(86)90188-2 ◽

1986 ◽

Vol 111 (3) ◽

pp. 275-288 ◽

Cited By ~ 79

Author(s):

J.M. Challen ◽

P.L.B. Oxley ◽

B.S. Hockenhull

Keyword(s):

Wear Mechanism ◽

Sliding Friction ◽

Low Cycle Fatigue ◽

Cycle Fatigue ◽

Wear Coefficient ◽

Fatigue Wear

Download Full-text

Influence of High-Cycle Fatigue on Crater Wear Characteristics of Cemented Carbide Tool

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.664.326 ◽

2015 ◽

Vol 664 ◽

pp. 326-336 ◽

Cited By ~ 2

Author(s):

Xiao Qi Song ◽

Junnosuke Saigawa ◽

Tohru Ihara

Keyword(s):

High Cycle Fatigue ◽

Adhesive Layer ◽

Cemented Carbide ◽

Work Piece ◽

Rake Face ◽

Cycle Fatigue ◽

Fatigue Wear ◽

Wear Model ◽

Crater Wear ◽

Surface Cluster

Recently, in order to make positively use of the effect of adhesive layer, which works as Build-up edge or Belag on the tool surface during machining operation, there have many investigations on the technique to reduce the wear of cutting tool. However, the mechanism of wear on the rake face is unknown and the reason why the adhesive layer can resist the abrasion is also unclear.This study aims to propose a new crater high-cycle fatigue wear model depending on the tool adhesion model established by the surface cluster on the interface between the Tool-Work Piece. By using this model we can elucidate the mechanism of adhesive layer. When the chip flows on the rake face, the commensurate phase occurs in the surface cluster on the interface, and the surface cluster slides in the similar form of dislocation. At the same time, the strong chemical bonding among the surface clusters becomes the repeat force which can result in the fatigue failure on the tool, and the tool crater wear happens. The energy dissipation process associates with the vibration of cluster, which increases the tool temperature rapidly. Therefore, the crater wear is a damage process on the tool with the high-temperature and high-cycle fatigue.In this study, the mechanism of crater wear when the cemented carbide cut the carbon steel was investigated using the adhesion cluster model, and the crater wear model was proposed to estimate the properties of the adhesive layer.

Download Full-text

An investigation of the roles of crack initiation, propagation and ratchetting in producing wear in metallic sliding contacts

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/0954406001522813 ◽

2000 ◽

Vol 214 (1) ◽

pp. 63-74 ◽

Cited By ~ 2

Author(s):

J Liu ◽

E. M. Kopalinsky ◽

P. L. B. Oxley

Keyword(s):

Wear Rate ◽

Low Cycle Fatigue ◽

Crack Propagation Rate ◽

Propagation Rate ◽

Wear Particles ◽

Cycle Fatigue ◽

Rotating Disc ◽

Wear Model ◽

Specimen Material ◽

Frictional Forces

Experiments are described in which the edge of a hard wedge is loaded against the periphery of a rotating disc of softer specimen material. The normal and frictional forces and inward movement of the wedge as the disc wears are continually monitored throughout a test. The results obtained are used together with measurements of the wearing surfaces of metallographic sections to test a newly proposed wear model. In this model it is assumed that ratchetting causes failure of the surface and hence the production of wear particles, while low-cycle fatigue determines the crack propagation rate and hence the wear rate.

Download Full-text

Effect of Texture and {10-12} Twin on the Low Cycle Fatigue Properties of Rolled AZ31 Mg Alloy

Korean Journal of Metals and Materials ◽

10.3365/kjmm.2013.51.5.325 ◽

2013 ◽

Vol 51 (5) ◽

pp. 325-332 ◽

Cited By ~ 5

Author(s):

Sung Hyuk Park ◽

Seong-Gu Hong ◽

Chong Soo Lee ◽

Ha Sik Kim

Keyword(s):

Low Cycle Fatigue ◽

Mg Alloy ◽

Fatigue Properties ◽

Cycle Fatigue ◽

Az31 Mg Alloy

Download Full-text

Fracture Surface in Low Cycle Fatigue of HA-188 Cobalt Base Alloy at High Temperature

Journal of the Society of Materials Science Japan ◽

10.2472/jsms.27.99 ◽

1978 ◽

Vol 27 (292) ◽

pp. 99-103 ◽

Cited By ~ 1

Author(s):

Kiyoshi KITA ◽

Masanori KIYOSHIGE ◽

Masatake TOMINAGA ◽

Junzo FUJIOKA

Keyword(s):

High Temperature ◽

Fracture Surface ◽

Base Alloy ◽

Low Cycle Fatigue ◽

Cycle Fatigue ◽

Cobalt Base Alloy ◽

Cobalt Base

Download Full-text

Features of the kinetics of cyclic elastoplastic deformation diagrams at dwells in cycles and superimposition of variable stresses on them

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2020-86-12-46-53 ◽

2020 ◽

Vol 86 (12) ◽

pp. 46-53

Author(s):

M. M. Gadenin

Keyword(s):

Experimental Data ◽

Elastoplastic Deformation ◽

Low Cycle Fatigue ◽

Cycle Fatigue ◽

Loading Cycle ◽

Additional Variable ◽

Dynamic Creep ◽

Variable Stresses ◽

Kinetics Of ◽

Deformation Diagrams

The goal of the study is determination of the regularities of changes in cyclic strains and related deformation diagrams attributed to the existence of time dwells in the loading modes and imposition of additional variable stresses on them. Analysis of the obtained experimental data on the kinetics of cyclic elastoplastic deformation diagrams and their parameters revealed that in contrast to regular cyclic loading (equal in stresses), additional deformations of static and dynamic creep are developed. The results of the studys are especially relevant for assessing the cyclic strength of unique extremely loaded objects of technology, including nuclear power equipment, units of aviation and space systems, etc. The experiments were carried out on the samples of austenitic stainless steel under low-cycle loading and high temperatures of testing. Static and dynamic creep deformations arising under those loading conditions promote an increase in the range of cyclic plastic strain in each loading cycle and also stimulate an increase in the range of elastoplastic strain due to active cyclic deformation. At the same time the existence of dwells on extrema of stresses in cycles without imposition of additional variable stresses on them most strongly affects the growth of plastic strain ranges in cycles. Imposition of additional variable stresses on dwells also results in the development of creep strains, but their growth turns out to be somewhat less than in the presence of dwells without stresses imposed. The diagrams of cyclic deformation obtained in the experiments are approximated by power dependences, their kinetics being described in terms of the number of loading cycles using corresponding temperature-time functions. At the same time, it is shown that increase in the cyclic plastic deformation for cycles with dwells and imposition of additional variable stresses on them decreases low cycle fatigue life compared to regular loading without dwells at the same stress amplitudes, moreover, the higher the values of static and dynamic creep, the greater decrease in low-cycle fatigue life. This conclusion results from experimental data and analysis of conditions of damage accumulation for the considered forms of the loading cycle using the deformation criterion of reaching the limit state leading to fracture.

Download Full-text

Damage accumulation near a hole under low cycle fatigue proceeding from measurements of local deformation response

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2020-86-10-46-55 ◽

2020 ◽

Vol 86 (10) ◽

pp. 46-55

Author(s):

S. I. Eleonsky ◽

Yu. G. Matvienko ◽

V. S. Pisarev ◽

A. V. Chernov

Keyword(s):

Stress Intensity Factor ◽

Stress Intensity ◽

Intensity Factor ◽

Damage Accumulation ◽

Stress Ratio ◽

Low Cycle Fatigue ◽

Accumulation Process ◽

Stress Range ◽

Cycle Fatigue ◽

Deformation Response

A new destructive method for quantitative determination of the damage accumulation in the vicinity of a stress concentrator has been proposed and verified. Increase of damage degree in local area with a high level of the strain gradient was achieved through preliminary low-cycle pull-push loading of plane specimens with central open holes. The above procedure is performed for three programs at the same stress range (333.3 MPa) and different stress ratio values 0.33, – 0.66 and – 1.0, and vice versa for two programs at the same stress ratio – 0.33 and different stress range 333.3 and 233.3 MPa. This process offers a set of the objects to be considered with different degree of accumulated fatigue damages. The key point of the developed approach consists in the fact that plane specimens with open holes are tested under real operation conditions without a preliminary notching of the specimen initiating the fatigue crack growth. The measured parameters necessary for a quantitative description of the damage accumulation process were obtained by removing the local volume of the material in the form of a sequence of narrow notches at a constant level of external tensile stress. External load can be considered an amplifier enhancing a useful signal responsible for revealing the material damage. The notch is intended for assessing the level of fatigue damage, just as probe holes are used to release residual stress energy in the hole drilling method. Measurements of the deformation response caused by local removing of the material are carried out by electronic speckle-pattern interferometry at different stages of low-cycle fatigue. The transition from measured in-plane displacements to the values of the stress intensity factor (SIF) and the T-stress was carried out on the basis of the relations of linear fracture mechanics. It was shown that the normalized dependences of the stress intensity factor on the durability percentage for the first notch (constructed for four programs of cyclic loading with different parameters), reflect the effect of the stress ratio and stress range of the loading cycle on the rate of damage accumulation. The data were used to obtain the explicit form of the damage accumulation function that quantitatively describes damage accumulation process. The functions were constructed for different stress ratios and stress ranges.

Download Full-text