The Experts below are selected from a list of 87 Experts worldwide ranked by ideXlab platform

Duncan P. Hand - One of the best experts on this subject based on the ideXlab platform.

  • nanosecond laser texturing for high friction applications
    Optics and Lasers in Engineering, 2014
    Co-Authors: Andrew Dunn, Erica B. Hansen, J. Gabzdyl, Krystian L. Wlodarczyk, Josephine V. Carstensen, Jonathan D. Shephard, Paul M Harrison, Duncan P. Hand
    Abstract:

    Abstract A nanosecond pulsed Nd:YAG fibre laser with wavelength of 1064 nm was used to texture several different Steels, including grade 304 stainless Steel, grade 316 stainless Steel, Cr–Mo–Al ‘Nitriding’ Steel and low alloy carbon Steel, in order to generate surfaces with a high static friction coefficient. Such surfaces have applications, for example, in large engines to reduce the tightening forces required for a joint or to secure precision fittings easily. For the generation of high friction textures, a hexagonal arrangement of laser pulses was used with various pulse overlaps and pulse energies. Friction testing of the samples suggests that the pulse energy should be high (around 0.8 mJ) and the laser pulse overlap should be higher than 50% in order to achieve a static friction coefficient of more than 0.5. It was also noted that laser processing increases the surface hardness of samples which appears to correlate with the increase in friction. Energy-Dispersive X-ray spectroscopy (EDX) measurements indicate that this hardness is caused by the formation of hard metal-oxides at the material surface.

  • Nanosecond laser texturing for high friction applications
    Optics and Lasers in Engineering, 2014
    Co-Authors: Andrew Dunn, Erica B. Hansen, J. Gabzdyl, Krystian L. Wlodarczyk, Josephine V. Carstensen, Jonathan D. Shephard, Paul M Harrison, Duncan P. Hand
    Abstract:

    A nanosecond pulsed Nd:YAG fibre laser with wavelength of 1064 nm was used to texture several different Steels, including grade 304 stainless Steel, grade 316 stainless Steel, Cr-Mo-Al 'Nitriding' Steel and low alloy carbon Steel, in order to generate surfaces with a high static friction coefficient. Such surfaces have applications, for example, in large engines to reduce the tightening forces required for a joint or to secure precision fittings easily. For the generation of high friction textures, a hexagonal arrangement of laser pulses was used with various pulse overlaps and pulse energies. Friction testing of the samples suggests that the pulse energy should be high (around 0.8 mJ) and the laser pulse overlap should be higher than 50% in order to achieve a static friction coefficient of more than 0.5. It was also noted that laser processing increases the surface hardness of samples which appears to correlate with the increase in friction. Energy-Dispersive X-ray spectroscopy (EDX) measurements indicate that this hardness is caused by the formation of hard metal-oxides at the material surface. © 2014 The Authors.

Andrew Dunn - One of the best experts on this subject based on the ideXlab platform.

  • nanosecond laser texturing for high friction applications
    Optics and Lasers in Engineering, 2014
    Co-Authors: Andrew Dunn, Erica B. Hansen, J. Gabzdyl, Krystian L. Wlodarczyk, Josephine V. Carstensen, Jonathan D. Shephard, Paul M Harrison, Duncan P. Hand
    Abstract:

    Abstract A nanosecond pulsed Nd:YAG fibre laser with wavelength of 1064 nm was used to texture several different Steels, including grade 304 stainless Steel, grade 316 stainless Steel, Cr–Mo–Al ‘Nitriding’ Steel and low alloy carbon Steel, in order to generate surfaces with a high static friction coefficient. Such surfaces have applications, for example, in large engines to reduce the tightening forces required for a joint or to secure precision fittings easily. For the generation of high friction textures, a hexagonal arrangement of laser pulses was used with various pulse overlaps and pulse energies. Friction testing of the samples suggests that the pulse energy should be high (around 0.8 mJ) and the laser pulse overlap should be higher than 50% in order to achieve a static friction coefficient of more than 0.5. It was also noted that laser processing increases the surface hardness of samples which appears to correlate with the increase in friction. Energy-Dispersive X-ray spectroscopy (EDX) measurements indicate that this hardness is caused by the formation of hard metal-oxides at the material surface.

  • Nanosecond laser texturing for high friction applications
    Optics and Lasers in Engineering, 2014
    Co-Authors: Andrew Dunn, Erica B. Hansen, J. Gabzdyl, Krystian L. Wlodarczyk, Josephine V. Carstensen, Jonathan D. Shephard, Paul M Harrison, Duncan P. Hand
    Abstract:

    A nanosecond pulsed Nd:YAG fibre laser with wavelength of 1064 nm was used to texture several different Steels, including grade 304 stainless Steel, grade 316 stainless Steel, Cr-Mo-Al 'Nitriding' Steel and low alloy carbon Steel, in order to generate surfaces with a high static friction coefficient. Such surfaces have applications, for example, in large engines to reduce the tightening forces required for a joint or to secure precision fittings easily. For the generation of high friction textures, a hexagonal arrangement of laser pulses was used with various pulse overlaps and pulse energies. Friction testing of the samples suggests that the pulse energy should be high (around 0.8 mJ) and the laser pulse overlap should be higher than 50% in order to achieve a static friction coefficient of more than 0.5. It was also noted that laser processing increases the surface hardness of samples which appears to correlate with the increase in friction. Energy-Dispersive X-ray spectroscopy (EDX) measurements indicate that this hardness is caused by the formation of hard metal-oxides at the material surface. © 2014 The Authors.

Sergio Valeri - One of the best experts on this subject based on the ideXlab platform.

  • tribological effects of surface texturing on Nitriding Steel for high performance engine applications
    Wear, 2008
    Co-Authors: Adriana Borghi, Enrico Gualtieri, Diego Marchetto, L Moretti, Sergio Valeri
    Abstract:

    Abstract This study reports on the effects of surface modification by laser texturing on tribological performances of Nitriding Steel for high-performance engine applications. In particular, a comparison of tribological properties on untextured and textured 30NiCrMo12 Nitriding Steel was made among hydrodynamic, mixed and boundary lubrication regimes. Ordered arrays of circular dimples were created on Nitriding Steel surfaces by Laser Surface Texturing. Friction experiments were performed using a pin-on-disc apparatus at sliding speeds ranging from 1 to 12 cm s−1 and nominal contact pressures ranging from 1 to 10 MPa. Static counterpart was a custom pin of 100Cr6 Steel. Two different configurations were studied: “single drop” lubrication and “dry contact”. Long sliding condition tests and Stribeck curves were obtained. Finally, Secondary Electron Microscopy imaging and Energy Dispersive Spectroscopy investigations were carried out to study morphology and chemistry at surfaces, before and after tribological tests. Maximum effects of Laser Surface Texturing on friction coefficient and wear have been observed in “single drop” configuration at high normal applied load and for long sliding time.

Erica B. Hansen - One of the best experts on this subject based on the ideXlab platform.

  • nanosecond laser texturing for high friction applications
    Optics and Lasers in Engineering, 2014
    Co-Authors: Andrew Dunn, Erica B. Hansen, J. Gabzdyl, Krystian L. Wlodarczyk, Josephine V. Carstensen, Jonathan D. Shephard, Paul M Harrison, Duncan P. Hand
    Abstract:

    Abstract A nanosecond pulsed Nd:YAG fibre laser with wavelength of 1064 nm was used to texture several different Steels, including grade 304 stainless Steel, grade 316 stainless Steel, Cr–Mo–Al ‘Nitriding’ Steel and low alloy carbon Steel, in order to generate surfaces with a high static friction coefficient. Such surfaces have applications, for example, in large engines to reduce the tightening forces required for a joint or to secure precision fittings easily. For the generation of high friction textures, a hexagonal arrangement of laser pulses was used with various pulse overlaps and pulse energies. Friction testing of the samples suggests that the pulse energy should be high (around 0.8 mJ) and the laser pulse overlap should be higher than 50% in order to achieve a static friction coefficient of more than 0.5. It was also noted that laser processing increases the surface hardness of samples which appears to correlate with the increase in friction. Energy-Dispersive X-ray spectroscopy (EDX) measurements indicate that this hardness is caused by the formation of hard metal-oxides at the material surface.

  • Nanosecond laser texturing for high friction applications
    Optics and Lasers in Engineering, 2014
    Co-Authors: Andrew Dunn, Erica B. Hansen, J. Gabzdyl, Krystian L. Wlodarczyk, Josephine V. Carstensen, Jonathan D. Shephard, Paul M Harrison, Duncan P. Hand
    Abstract:

    A nanosecond pulsed Nd:YAG fibre laser with wavelength of 1064 nm was used to texture several different Steels, including grade 304 stainless Steel, grade 316 stainless Steel, Cr-Mo-Al 'Nitriding' Steel and low alloy carbon Steel, in order to generate surfaces with a high static friction coefficient. Such surfaces have applications, for example, in large engines to reduce the tightening forces required for a joint or to secure precision fittings easily. For the generation of high friction textures, a hexagonal arrangement of laser pulses was used with various pulse overlaps and pulse energies. Friction testing of the samples suggests that the pulse energy should be high (around 0.8 mJ) and the laser pulse overlap should be higher than 50% in order to achieve a static friction coefficient of more than 0.5. It was also noted that laser processing increases the surface hardness of samples which appears to correlate with the increase in friction. Energy-Dispersive X-ray spectroscopy (EDX) measurements indicate that this hardness is caused by the formation of hard metal-oxides at the material surface. © 2014 The Authors.

J. Gabzdyl - One of the best experts on this subject based on the ideXlab platform.

  • nanosecond laser texturing for high friction applications
    Optics and Lasers in Engineering, 2014
    Co-Authors: Andrew Dunn, Erica B. Hansen, J. Gabzdyl, Krystian L. Wlodarczyk, Josephine V. Carstensen, Jonathan D. Shephard, Paul M Harrison, Duncan P. Hand
    Abstract:

    Abstract A nanosecond pulsed Nd:YAG fibre laser with wavelength of 1064 nm was used to texture several different Steels, including grade 304 stainless Steel, grade 316 stainless Steel, Cr–Mo–Al ‘Nitriding’ Steel and low alloy carbon Steel, in order to generate surfaces with a high static friction coefficient. Such surfaces have applications, for example, in large engines to reduce the tightening forces required for a joint or to secure precision fittings easily. For the generation of high friction textures, a hexagonal arrangement of laser pulses was used with various pulse overlaps and pulse energies. Friction testing of the samples suggests that the pulse energy should be high (around 0.8 mJ) and the laser pulse overlap should be higher than 50% in order to achieve a static friction coefficient of more than 0.5. It was also noted that laser processing increases the surface hardness of samples which appears to correlate with the increase in friction. Energy-Dispersive X-ray spectroscopy (EDX) measurements indicate that this hardness is caused by the formation of hard metal-oxides at the material surface.

  • Nanosecond laser texturing for high friction applications
    Optics and Lasers in Engineering, 2014
    Co-Authors: Andrew Dunn, Erica B. Hansen, J. Gabzdyl, Krystian L. Wlodarczyk, Josephine V. Carstensen, Jonathan D. Shephard, Paul M Harrison, Duncan P. Hand
    Abstract:

    A nanosecond pulsed Nd:YAG fibre laser with wavelength of 1064 nm was used to texture several different Steels, including grade 304 stainless Steel, grade 316 stainless Steel, Cr-Mo-Al 'Nitriding' Steel and low alloy carbon Steel, in order to generate surfaces with a high static friction coefficient. Such surfaces have applications, for example, in large engines to reduce the tightening forces required for a joint or to secure precision fittings easily. For the generation of high friction textures, a hexagonal arrangement of laser pulses was used with various pulse overlaps and pulse energies. Friction testing of the samples suggests that the pulse energy should be high (around 0.8 mJ) and the laser pulse overlap should be higher than 50% in order to achieve a static friction coefficient of more than 0.5. It was also noted that laser processing increases the surface hardness of samples which appears to correlate with the increase in friction. Energy-Dispersive X-ray spectroscopy (EDX) measurements indicate that this hardness is caused by the formation of hard metal-oxides at the material surface. © 2014 The Authors.