State of the Art in Laser Surface Texturing

Volume 1 ◽  
2004 ◽  
Author(s):  
Izhak Etsion
Keyword(s):  
Surface Engineering ◽  
State Of The Art ◽  
Load Capacity ◽  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Mechanical Seals ◽  
Current Effort ◽  
Hydrodynamic Bearing ◽  
Micro Dimples

Surface texturing has emerged in the last decade as a viable option of surface engineering resulting in significant improvement in load capacity, wear resistance, friction coefficient etc. of tribological mechanical components. Various techniques can be employed for surface texturing but Laser Surface Texturing (LST) is probably the most advanced so far. LST produces a very large number of micro-dimples on the surface and each of these micro-dimples can serve either as a micro- hydrodynamic bearing in cases of full or mixed lubrication, a micro-reservoir for lubricant in cases of starved lubrication conditions, or a micro-trap for wear debris in either lubricated or dry sliding. The present paper reviews the current effort being made world wide on surface texturing in general and on laser surface texturing in particular. It presents the state of the art of LST and the potential of this technology in various lubricated applications like mechanical seals, piston rings and thrust bearings. The paper also describes some fundamental on going research around the world with LST.

State of the Art in Laser Surface Texturing

2005 ◽  
Vol 127 (1) ◽  
pp. 248-253 ◽  
Author(s):  
Izhak Etsion
Keyword(s):  
Surface Engineering ◽  
State Of The Art ◽  
Load Capacity ◽  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Mechanical Seals ◽  
Current Effort ◽  
Hydrodynamic Bearing ◽  
Micro Dimples

Surface texturing has emerged in the last decade as a viable option of surface engineering resulting in significant improvement in load capacity, wear resistance, friction coefficient etc. of tribological mechanical components. Various techniques can be employed for surface texturing but Laser Surface Texturing (LST) is probably the most advanced so far. LST produces a very large number of micro-dimples on the surface and each of these micro-dimples can serve either as a micro-hydrodynamic bearing in cases of full or mixed lubrication, a micro-reservoir for lubricant in cases of starved lubrication conditions, or a micro-trap for wear debris in either lubricated or dry sliding. The present paper reviews the current effort being made world wide on surface texturing in general and on laser surface texturing in particular. It presents the state of the art in LST and the potential of this technology in various lubricated applications like mechanical seals, piston rings and thrust bearings. The paper also describes some fundamental on going research around the world with LST.

A Laser Surface Textured Journal Bearing

2012 ◽  
Vol 134 (3) ◽  
Author(s):  
V. Brizmer ◽  
Y. Kligerman
Keyword(s):  
Journal Bearing ◽  
Load Capacity ◽  
Surface Texturing ◽  
Maximum Load ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Regular Surface ◽  
Optimum Parameters ◽  
Micro Dimples ◽  
Potential Use

The potential use of laser surface texturing (LST) in hydrodynamic journal bearings is examined theoretically. The regular surface texture has the form of micro-dimples with preselected diameter, depth, and area density. It can be applied to only a certain portion of the bearing perimeter (partial LST) or the full bearing perimeter (full LST). The effect of such a texture on load capacity and on the attitude angle of the journal bearing is investigated in the present work. The optimum parameters of the dimples and favorable LST mode for maximum load capacity have been found.

Stiffness and Efficiency Optimization of a Hydrostatic Laser Surface Textured Gas Seal

2006 ◽  
Vol 129 (2) ◽  
pp. 407-410 ◽  
Author(s):  
Y. Feldman ◽  
Y. Kligerman ◽  
I. Etsion
Keyword(s):  
Reynolds Equation ◽  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Narrow Gap ◽  
Mechanical Seals ◽  
Gas Leakage ◽  
Dimensionless Analysis ◽  
High Area ◽  
Film Stiffness

Microdimples generated by laser surface texturing (LST) can be used to enhance performance in hydrostatic gas-lubricated mechanical seals. This is achieved by applying microdimples with high area density over a certain portion of the sealing dam width adjacent to the high-pressure side, leaving the remaining portion untextured. The textured portion provides an equivalent larger gap that results in converging clearance in the direction of pressure drop and hence, hydrostatic pressure buildup, similar to that of a radial step seal. A mathematical model based on the solution of the Reynolds equation for compressible Newtonian fluid in a narrow gap between two nominally parallel stationary surfaces is developed. A detailed dimensionless analysis of the texturing parameters is performed to achieve maximum gas film stiffness with minimum gas leakage.

Experimental investigation for vibration reduction of surface-textured journal bearings

2019 ◽  
Vol 71 (2) ◽  
pp. 232-241 ◽  
Author(s):  
Chao Chen ◽  
Xiaojing Wang ◽  
Yifan Shen ◽  
Zhaolun Li ◽  
Jian Dong
Keyword(s):  
Friction Coefficient ◽  
Surface Texture ◽  
Surface Engineering ◽  
Dynamic Properties ◽  
Surface Texturing ◽  
Lower Surface ◽  
Journal Bearings ◽  
Laser Surface Texturing ◽  
Content Type ◽  
Micro Dimples

PurposeSurface texturing has emerged in the past two decades as a viable option of surface engineering, resulting in significant improvement in wear resistance and friction coefficient. The purpose of this study is to find the appropriate surface texture to reduce vibration and improve the stability of journal bearings.Design/methodology/approachMicro-dimples, evenly distributed in a square array, were selected as the texture pattern and formed on the lower surface of bush by the laser surface texturing technique. Experiments were carried out to evaluate the effects of micro-dimples under different depths, densities and distributions.FindingsThe results are summarized in the form of shaft center orbits, waterfall illustrations and Hilbert-Huang transforms. In the entire test, it was found that an optimum geometric and distributive range of micro-dimples exists, where vibration acceleration can be decreased at least 3dB and stability can be greatly improved.Originality/valueA majority of researchers devoted to studying on static characteristics, such as friction coefficient, load carrying capacity, pressure distribution and cavitation model. Besides, the influence of surface texture on stability of rotor-journal bearing system was rarely investigated and the recent examples can be found in Refs. (Ausas et al. 2007). However, a complete study of textured journal bearings has not been undertaken in the dynamic properties. Therefore, the purpose of this paper is to experimentally investigate the comprehensive effects of density, depth and distribution of micro-dimples on bearing vibration and stability.

Hydrodynamic Lubrication and Load Carrying Capacity Analysis of Laser Surface Texturing Valve Core

2016 ◽  
Vol 693 ◽  
pp. 348-355
Author(s):  
Tao He ◽  
Chuan Li Wang ◽  
Hai Shun Deng ◽  
Yan Long Huang ◽  
Cao Feng Yu
Keyword(s):  
Surface Pressure ◽  
Carrying Capacity ◽  
Hydrodynamic Lubrication ◽  
Load Capacity ◽  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Process Technology ◽  
The Core ◽  
Lubrication Performance

Take water hydraulic slide valve core as the research object. Laser surface texturing (LST) technology was used to improve the valve core carrying capacity and hydrodynamic lubrication characteristics, which can process micro-texture on the surface of the core. And CFD method was taken to calculate flow field of smooth and laser surface texturing core respectively. For studying the influence of valve core micro-texture and valve core overlap lengths on hydrodynamic lubrication characteristic and carrying capacity of the core, core surface pressure distribution, surface pressure and friction force curves were drawn. Results show: The smooth valve core does not produce hydrodynamic lubrication effect, but textured valve core can bring the oil film load capacity, so as to make the effect of mixed friction between valve core and sleeve weaken. And along with the decrease of the core overlap length, the carrying capacity on the surface of the textured valve core does not decrease but increase when the valve core overlap length amount is greater than 2.5mm.The results provide important theoretical reference of studying and applying LST process technology to the valve core friction pair’s lubrication performance.

scholarly journals STATE OF THE ART OF SURFACE TEXTURING FOR BIOTRIBOLOGY APPLICATIONS

2021 ◽  
Vol 13 (3) ◽  
pp. 143-150
Author(s):  
Daniel I. Quintanilla-Correa ◽  
◽  
Laura Peña-Parás ◽  
Demofilo Maldonado-Cortés ◽  
Martha Claudia Rodriguez-Villalobos ◽  
...  
Keyword(s):  
State Of The Art ◽  
Surface Texturing ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Surface Pattern ◽  
Wear Particles ◽  
Abrasive Particles ◽  
Useful Life ◽  
Three Body

Surface texturing can be defined as a technique that consists of creating micro cavities in the surface of a material. There are different texturing techniques such as chemical etching, electromechanical micromachining, diamond embossing, electric discharge, pellet-pressing and laser surface, the last being the most common. For years, these surface texturing techniques have been used in tribological applications because microcavities can store oils or fluids and constantly lubricate the surfaces that are subjected to wear; they can also be used to trap wear particles (debris) that would otherwise act as abrasive particles (three body abrasive wear). This literature review seeks to analyse and compare the advantages that the use of surface texturing techniques can offer in reducing the wear of prosthetic components and therefore lengthening their useful life, to provide a better quality of life to patients. The results of this review showed a growing interest in the scientific community in the use of surface texturing for biotribogical applications, using to a greater extent the Laser Surface Texturing (LST) technique and the surface pattern composed by dimples.

The Effect of Laser Surface Texturing on Soft Elasto-Hydrodynamic Lubrication Considering Non-Linear Elasticity

2008 ◽  
Author(s):  
Alexey Shinkarenko ◽  
Yuri Kligerman ◽  
Izhak Etsion
Keyword(s):  
Linear Model ◽  
Hydrodynamic Lubrication ◽  
Load Capacity ◽  
Surface Texturing ◽  
Laser Surface ◽  
Operating Conditions ◽  
Constitutive Law ◽  
Laser Surface Texturing ◽  
Wide Range ◽  
Non Linear

A non-linear theoretical model is presented to study the effect of laser surface texturing (LST) on the load carrying capacity in soft elasto-hydrodynamic lubrication (SEHL). Both geometrical and physical non-linearity of the elastomer is considered by using a logarithmic strain and the Mooney-Rivlin constitutive law, respectively. The results of the present non-linear model are compared with those of a previous linear one over a wide range of operating conditions. It is found that the two models predict the same optimum LST parameters for maximum load capacity but the non-linear model gives load capacity that is up to 10% lower than that obtained from the linear model.

scholarly journals Does laser surface texturing really have a negative impact on the fatigue lifetime of mechanical components?

Friction ◽  
2021 ◽  
Author(s):  
Chia-Jui Hsu ◽  
Andreas Stratmann ◽  
Simon Medina ◽  
Georg Jacobs ◽  
Frank Mücklich ◽  
...  
Keyword(s):  
Boundary Lubrication ◽  
Surface Texturing ◽  
Contact Stresses ◽  
Laser Surface ◽  
Laser Surface Texturing ◽  
Wear Loss ◽  
Textured Surface ◽  
Periodic Patterns ◽  
Rolling Bearings ◽  
Fatigue Lifetime

AbstractLaser surface texturing (LST) has been proven to improve the tribological performance of machine elements. The micro-scale patterns manufactured by LST may act as lubricant reservoirs, thus supplying oil when encountering insufficient lubrication. However, not many studies have investigated the use of LST in the boundary lubrication regime, likely due to concerns of higher contact stresses that can occur with the increasing surface roughness. This study aims to examine the influence of LST on the fatigue lifetime of thrust rolling bearings under boundary lubrication. A series of periodic patterns were produced on the thrust rolling bearings, using two geometrically different designs, namely cross and dimple patterns. Base oil ISO VG 100 mixed with 0.05 wt% P of zinc dialkyldithiophosphate (ZDDP) was supplied. The bearings with cross patterns reduce the wear loss by two orders of magnitude. The patterns not only retain lubricant in the textured pockets but also enhance the formation of an anti-wear tribofilm. The tribofilm generation may be improved by the higher contact stresses that occur when using the textured surface. Therefore, in contrast to the negative concerns, the ball bearings with cross patterns were instead found to increase the fatigue life by a factor of three.

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