Robust measurement of surface topography for additive manufacturing using imaging confocal microscopy DOI
Narcís Vilar,

Roger Artigas,

Martí Duocastella

et al.

Published: Aug. 15, 2023

Additive manufacturing (AM) has brought a new level of innovation to the production metal parts, allowing for greater design freedom and on-demand fabrication capabilities. However, measurement resulting surface texture increased difficulties. Whilst optical techniques provide fast measurements, high irregularities, large range scales features, variations in reflectivity largely compromise performance. In practice, conventional systems have an insufficient field-of-view (FOV) or produce excessive amount artifacts. We present system optimized measure AM featuring sufficiently wide capture interest, numerical aperture (NA). integrated commercially available objective (SHR Plan Apo 2×, Nikon) with custom-designed tube lens measuring head, achieving magnification 4.2× effective NA 0.26. The implements confocal-like HiLo technique, we experimentally demonstrate successful characterisation parts. Furthermore, report discuss 6×/0.45 microscope objective, great promise Additionally, explore dynamic (HDR) approaches tackle issue variation. Multiple low images taken at illumination intensities are combined reconstruct single topography map. all, combination system, capable capturing scale spatial HDR capability offers versatile solution that can be used variety scientific industrial contexts.

Language: Английский

The Effect of Organic Fillers on the Mechanical Strength of the Joint in the Adhesive Bonding DOI Open Access
Nergizhan Anaç, Zekeriya Doğan

Processes, Journal Year: 2023, Volume and Issue: 11(2), P. 406 - 406

Published: Jan. 30, 2023

The most important advantages of adding additives to adhesives are increasing the bonding strength and reducing adhesive cost. desire reduce costs as well need for environmentally friendly health-friendly products have paved way recycling waste materials use cheaper natural additives. In this study, mussel, olive pomace, walnut powders in different ratios (5%, 15%, 30% by weight) sizes (38 45 µm) were added an epoxy adhesive. steel joined form single-lap joints using obtained with These subjected tensile test strengths these examined. SEM images interface taken, distribution was When powder size µm, bond increased all additive compared pure adhesive, while 38 µm powders, value only at 5% ratio. additives, up 38% rate determined 31% µm.

Language: Английский

Citations

10
Robust residual convolutional neural network based pupil tracking for low-computational power applications DOI
Gorkem Can Ates, Caglar Coskunpinar,

David Tse

et al.

Engineering Applications of Artificial Intelligence, Journal Year: 2024, Volume and Issue: 133, P. 108235 - 108235

Published: March 16, 2024

Language: Английский

Citations

2
Optical system for the measurement of the surface topography of additively manufactured parts DOI
Narcís Vilar,

Roger Artigas,

Carlos Bermúdez

et al.

Measurement Science and Technology, Journal Year: 2022, Volume and Issue: 33(10), P. 104001 - 104001

Published: June 27, 2022

Abstract Additive manufacturing (AM) is now regularly used for customised fabrication of parts with complex shapes and geometries. However, the large range relevant scales, high slopes, step-like transitions, undercuts, alternation between dark overly bright regions other features present on surfaces, in particular metal additive parts, represent a significant challenge current optical measurement technologies. Measuring surfaces such requires numerical aperture (NA) optics, state-of-the-art systems commonly include optics that can only reliably acquire surface topographies over small field view (FOV), typically tens or hundreds micrometers. Such measurements are often insufficient practical applications. Here, we an system NA ( > 0.3) wide FOV $2.9\,\times\,2.9$?> 2.9 × mm, capable measuring AM single measurement, without need lateral stitching to increase FOV. The proposed exhibits properties provide facility large-field, high-resolution industrially-produced additively manufactured parts.

Language: Английский

Citations

9
Investigation of the Effect of the Surface Treatment and Lubrication During Repeated Tightening on the Nut Coefficient of a Bolted Joint Using the Taguchi Method DOI Open Access

Talal Alsardia,

László Lovas

Jordan Journal of Mechanical and Industrial Engineering, Journal Year: 2024, Volume and Issue: 18(01), P. 131 - 144

Published: Feb. 29, 2024

Bolted joints are used extensively in mechanical engineering due to their reusability, appearance, and strength advantages.In different industrial applications, the separated components clamped together during assembly using a tightening process.Estimating precisely initially achieved clamping force is persistent problem for providing secure reliable connection particular design.However, nut coefficient one of exploratory methods this purpose.This paper aims investigate how bolted joint influenced by factors such as bolt/nut surface treatment presence lubrication at contact surfaces throughout cyclic assembly/disassembly process, serving simulation real-life maintenance operations where same reused.Torquing cycles were introduced with two finishes four conditions.The experiments conducted on bolts room temperature according ISO16047.The was calculated bolt sizes M6*1, M8*1.5, M10*1.5.The results analyzed analysis variance Taguchi method L32 estimating contribution coefficient.It found that most significant parameter affecting factor regardless size.Also, case study underlying reasons behind significance influencing across sizes.

Language: Английский

Citations

1
Robust measurement of surface topography for additive manufacturing using imaging confocal microscopy DOI
Narcís Vilar,

Roger Artigas,

Martí Duocastella

et al.

Published: Aug. 15, 2023

Additive manufacturing (AM) has brought a new level of innovation to the production metal parts, allowing for greater design freedom and on-demand fabrication capabilities. However, measurement resulting surface texture increased difficulties. Whilst optical techniques provide fast measurements, high irregularities, large range scales features, variations in reflectivity largely compromise performance. In practice, conventional systems have an insufficient field-of-view (FOV) or produce excessive amount artifacts. We present system optimized measure AM featuring sufficiently wide capture interest, numerical aperture (NA). integrated commercially available objective (SHR Plan Apo 2×, Nikon) with custom-designed tube lens measuring head, achieving magnification 4.2× effective NA 0.26. The implements confocal-like HiLo technique, we experimentally demonstrate successful characterisation parts. Furthermore, report discuss 6×/0.45 microscope objective, great promise Additionally, explore dynamic (HDR) approaches tackle issue variation. Multiple low images taken at illumination intensities are combined reconstruct single topography map. all, combination system, capable capturing scale spatial HDR capability offers versatile solution that can be used variety scientific industrial contexts.

Language: Английский

Citations

0