Directional friction surfaces through asymmetrically shaped dimpled surfaces patterned using inclined flat end milling

Resendiz, Jesus; Graham, Eldon; Egberts, Philip; Park, Simon S.

doi:10.1016/j.triboint.2015.06.025

Cited by 20 publications

(7 citation statements)

References 25 publications

(37 reference statements)

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“…This will be a crucial factor for applying scale-like surface morphologies in real-life tribological applications, especially as the exact texturing parameters, like the scale size and packing, need to be adapted for each tribological system. The superior results obtained from the application of laser light for the generation of surface morphologies such as dimples is the reason why laser surface texturing has replaced other surface texturing techniques over the last decades [ 10 , 15 ], with notable exceptions such as end milling [ 59 ]. Another aspect beckoning future research is the hardness of the scale-like structures created by laser texturing.…”

Section: Resultsmentioning

confidence: 99%

Friction reduction through biologically inspired scale-like laser surface textures

Schneider¹,

Djamiykov²,

Greiner³

2018

Beilstein J. Nanotechnol.

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Reducing friction forces is a major challenge in many engineering applications involving moving parts. For the past 50 years, the morphological texturing of surfaces for improving tribological properties has been investigated. Only recently, the application of biologically inspired surface features, like scales found on lizards and snakes, has come to the attention of tribologists. Here, we present results of the lubricated and unlubricated performance of biologically inspired scale-like textures applied with laser light to the surface of bearing steel pins. These were paired in unidirectional sliding against metallic (100Cr6), polymeric (PEEK) and ceramic (Al2O3) counter bodies. Additionally, a possible size effect was investigated by changing the scale diameter between 13 and 150 µm under dry sliding contact against sapphire. Our results demonstrate that depending on the contact conditions a biologically inspired surface morphology has the potential to reduce friction forces by more than 80%. However, under certain conditions, especially for slow-moving lubricated steel-on-steel and steel-on-ceramic contacts, these surface morphologies may increase friction as well. Similar to classical laser surface textures, such as round dimples, these biologically inspired morphologies need to be carefully optimized for each tribological system in which they are intended to be applied. There is no standard solution for all sliding conditions. The results presented here demonstrate that such efforts have the potential to yield significant reduction in friction forces and are expected to spark future research in the field of biologically inspired surface morphologies applied to tribological contacts.

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Section: Resultsmentioning

confidence: 99%

Friction reduction through biologically inspired scale-like laser surface textures

Schneider¹,

Djamiykov²,

Greiner³

2018

Beilstein J. Nanotechnol.

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“…This rubbing effect increases the cutting force magnitude as well as produces a poor surface finish, as shown in Figure 6(b), along with shorter tool life. According to others research work [18,19], the rubbing effect could be counter by slanting the workpiece or by inclining the tool. This technique avoiding the low cutting speed region to have contact during machining and ensure the contact point of tool and workpiece displaced away from the tool centre axis Figure 6(c), thus minimising the effect as well as helps to improve the surface finish.…”

Section: Resultsmentioning

confidence: 99%

Influence of Cutting Parameters to Surface Area Roughness in Dimple Machining Using Milling Process

Hanafiah

Aziz

Yusoff

2021

IJAME

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Surface quality is among the predominant criterion in measuring machining process performance, including milling. It is extremely dependent on the process variable, such as cutting parameters and cutting tool conditions. The main intention of this research work is to study the effect of the milling machining parameters, including depth of cut, spindle speed, feed rate as well as machining pattern to the final surface area roughness of the fabricated dimple structure. The concave profile of the dimple is machined at the right angle to a flat Al6061 specimen using a ball end mill attached to a 3-axis CNC milling machine, and the surface area of the concave profile is measured using 3D measuring laser microscope. It is observed that surface area roughness reacts with the spindle speed and feed rate with different tool sizes. Based on the result gained, the work has successfully characterised the influence of studied milling parameters on the dimple surface area roughness, where within the range of the studied parameter, the surface area roughness varies only less than 2.2 μm. The research work will be continued further on the incline milling technique and micro size ball end mill.

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“…In this chapter, Matlab was used to simulate the four-beam laser interference intensity It is known in theory that an array of micro circular dimples on the surfaces of artificial bones can reduce the real contact area in order to improve the wear resistance of the surfaces [8,111,120,121]. However, the effects of dimple shape, size and density on HV and friction of Co-Cr-Mo alloy has been yet to be determined.…”

Section: Discussionmentioning

confidence: 99%

“…Bearing wear of artificial joint induced the implant loosening, and caused osteolysis and bacterial infection by local host biological responses, which were the commonly occurred inducements of revision [6,7]. Wear and friction occurred during the relative motion of contacted surfaces and the deformation and energy losses usually caused by increased friction coefficients in the biomedical system [8]. A successful implantation depends on two main critical issues.…”

Section: List Of Abbreviationsmentioning

confidence: 99%

“…Experiments that were conducted in the first group focused on the dimpled structures The fabrication results are shown in The second group of experiments aims to fabricate dimpled and dotted microstructures on the surfaces of Ti-6Al-4V alloy. In this group, three samples (7)(8)(9) of micro dimpled and dotted structures with the period of 5  m and seven samples (10)(11)(12)(13)(14)(15)(16) with the period of 10  m were fabricated. The fabrication parameters of Group 2 experiments are given in Table 6.3.…”

Section: Dimpled and Dotted Structures Fabrication Using A Three-beammentioning

confidence: 99%

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Laser Interference Lithography for Applications in Biomedicine

2017

IFMBE Proceedings

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Surface modification of implant biomaterials has become the commonly used methods for the long life artificial implants and successful orthopaedic implantation. Numbers of technologies have been developed to improve the performances of artificial implants in biological systems. However, most of the technologies are associated with complex, time-consuming and not fully controllable processes, resulting in undesirable micro and nano structures. DLIL provides an effective method for nanomanufacturing of well-designed structures with controllability. The research reported in this thesis tackles the issues with particular focus on DLIL for the fabrication of well-designed micro and nano structures with functionalities including superhydrophobic, wear resistant property and biocompatibility on various biomaterials. Four-beam DLIL was developed to design and fabricate the micro and nano convex structures on silicon surfaces. Parameters such as incident angle, azimuthal angle and polarisation direction were adjusted to simulate micro patterns in period of 5.5 μm for structure design, and laser fluence and exposure duration were set to fabricate micro III PUBLISHED WORK AS PARTS OF THIS THESIS  Research described in Section 4.2 (Simulations and experiments of fabrication of superhydrophobic surfaces on silicon) and Section 4.3 (Results and discussions)

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Directional friction surfaces through asymmetrically shaped dimpled surfaces patterned using inclined flat end milling

Cited by 20 publications

References 25 publications

Friction reduction through biologically inspired scale-like laser surface textures

Friction reduction through biologically inspired scale-like laser surface textures

Influence of Cutting Parameters to Surface Area Roughness in Dimple Machining Using Milling Process

Laser Interference Lithography for Applications in Biomedicine

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