Automotive hybrid design production and effective end machining by novel abrasive waterjet technique

ABSTRACTActive flow control for aerofoils has been proven to be an effective way to improve the aerodynamic performance of aircraft. A conceptual hybrid design with surfaces embedded with Shape-Memory Alloy (SMA) and trailing Macro Fibre Composites (MFC) is proposed to implement active flow control for aerofoils. A Computational Fluid Dynamics (CFD) model has been built to explore the feasibility and potential performance of the proposed conceptual hybrid design. Accordingly, numerical analysis is carried out to investigate the unsteady flow characteristics by dynamic morphing rather than using classical static simulations and complicated coupling. The results show that camber growth by SMA action could cause an evident rise of Cl and Cd in the take-off/landing phases when the Angle-of-Attack (AoA) is less than 10°. The transient tail vibration behaviour in the cruise period when using MFC actuators is studied over wide ranges of frequency, AoA and vibration amplitude. The buffet frequency is locked in by the vibration frequency, and a decrease of 1.66–2.32% in Cd can be achieved by using a proper vibration frequency and amplitude.

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Steel Work Design, Production and Analysis of a FishFeed Mixing Machine

Heliyon ◽

10.1016/j.heliyon.2021.e07658 ◽

2021 ◽

pp. e07658

Author(s):

Paul Chukwulozie Okolie ◽

Echezona Nnaemeka Obika ◽

Benjamin Segun Oluwadare ◽

Azaka Onyemazuwa Andrew ◽

Uchenna Onyebuchi Okolie

Keyword(s):

Work Design ◽

Steel Work ◽

Design Production

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Evolutionary design of optimal surface topographies for biomaterials

Scientific Reports ◽

10.1038/s41598-020-78777-2 ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Aliaksei Vasilevich ◽

Aurélie Carlier ◽

David A. Winkler ◽

Shantanu Singh ◽

Jan de Boer

Keyword(s):

High Throughput Screening ◽

Random Mutagenesis ◽

Material Design ◽

Fitness Assessment ◽

Surface Topographies ◽

Optimal Surface ◽

Design Production ◽

Brute Force Approach ◽

Survival Of The Fittest ◽

Selection Of

AbstractNatural evolution tackles optimization by producing many genetic variants and exposing these variants to selective pressure, resulting in the survival of the fittest. We use high throughput screening of large libraries of materials with differing surface topographies to probe the interactions of implantable device coatings with cells and tissues. However, the vast size of possible parameter design space precludes a brute force approach to screening all topographical possibilities. Here, we took inspiration from Nature to optimize materials surface topographies using evolutionary algorithms. We show that successive cycles of material design, production, fitness assessment, selection, and mutation results in optimization of biomaterials designs. Starting from a small selection of topographically designed surfaces that upregulate expression of an osteogenic marker, we used genetic crossover and random mutagenesis to generate new generations of topographies.

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Impacts of Traverse Speed and Material Thickness on Abrasive Waterjet Contour Cutting of Austenitic Stainless Steel AISI 304L

Applied Sciences ◽

10.3390/app11114925 ◽

2021 ◽

Vol 11 (11) ◽

pp. 4925

Author(s):

Jennifer Milaor Llanto ◽

Majid Tolouei-Rad ◽

Ana Vafadar ◽

Muhammad Aamir

Keyword(s):

Material Removal Rate ◽

Material Removal ◽

Removal Rate ◽

Traverse Speed ◽

Abrasive Waterjet ◽

Taper Angle ◽

Material Thickness ◽

Abrasive Waterjet Machining ◽

Kerf Taper ◽

Waterjet Machining

Abrasive water jet machining is a proficient alternative for cutting difficult-to-machine materials with complex geometries, such as austenitic stainless steel 304L (AISI304L). However, due to differences in machining responses for varied material conditions, the abrasive waterjet machining experiences challenges including kerf geometric inaccuracy and low material removal rate. In this study, an abrasive waterjet machining is employed to perform contour cutting of different profiles to investigate the impacts of traverse speed and material thickness in achieving lower kerf taper angle and higher material removal rate. Based on experimental investigation, a trend of decreasing the level of traverse speed and material thickness that results in minimum kerf taper angle values of 0.825° for machining curvature profile and 0.916° for line profiles has been observed. In addition, higher traverse speed and material thickness achieved higher material removal rate in cutting different curvature radii and lengths in line profiles with obtained values of 769.50 mm3/min and 751.5 mm3/min, accordingly. The analysis of variance revealed that material thickness had a significant impact on kerf taper angle and material removal rate, contributing within the range of 69–91% and 62–69%, respectively. In contrast, traverse speed was the least factor measuring within the range of 5–18% for kerf taper angle and 27–36% for material removal rate.

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Abrasive waterjet cutting of boron carbide particles reinforced Al 6063 MMCs - A semi empirical modeling approach in the prediction of kerf angle

Measurement ◽

10.1016/j.measurement.2021.109492 ◽

2021 ◽

pp. 109492

Author(s):

V. Mohankumar ◽

M. Kanthababu ◽

A. Velayudham

Keyword(s):

Boron Carbide ◽

Empirical Modeling ◽

Abrasive Waterjet ◽

Waterjet Cutting ◽

Modeling Approach ◽

Abrasive Waterjet Cutting ◽

Kerf Angle ◽

Semi Empirical ◽

Carbide Particles

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Abrasive Waterjet Cutting of Aluminum Alloys: Workpiece Surface Roughness

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.404.3 ◽

2013 ◽

Vol 404 ◽

pp. 3-9 ◽

Cited By ~ 5

Author(s):

Nihat Tosun ◽

Ihsan Dagtekin ◽

Latif Ozler ◽

Ahmet Deniz

Keyword(s):

Mechanical Properties ◽

Surface Roughness ◽

Aluminum Alloys ◽

Abrasive Waterjet ◽

Traditional Methods ◽

Workpiece Surface ◽

Abrasive Waterjet Machining ◽

Waterjet Machining ◽

Area Of Application ◽

Better Than

Abrasive waterjet machining is one of the non-traditional methods of the recent years which found itself a wide area of application in the industry for machining of different materials. In this paper, the surface roughness of 6061-T6 and 7075-T6 aluminum alloys are being cut with abrasive waterjet is examined experimentally. The experiments were conducted with different waterjet pressures and traverse speeds. It has been found that the surface roughness obtained by cutting material with high mechanical properties is better than that of obtained by cutting material with inferior mechanical properties.

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