scholarly journals Analysis of Parameters Influencing Build Accuracy of a SLM Printed Compressor Outlet Guide Vane

2018 ◽  
Author(s):  
Adetayo Otubusin ◽  
Paul Wood ◽  
John Appleby ◽  
Rafael Adamczuk
Keyword(s):  
Guide Vane ◽  
Plate Thickness ◽  
Paper Analysis ◽  
Jet Engines ◽  
Thickness Change ◽  
Nickel Chromium ◽  
Profile Tolerance ◽  
3D Printed ◽  
Part Orientation ◽  
Conventional Machining

The paper describes the manufacture of an outlet guide vane (OGV) of jet engines by the Selective Laser Melting (SLM) process, in view of current challenges for conventional machining approaches such as; high airfoil profile tolerances, limited tooling access and hard to machine materials like nickel-chromium-based super alloys. Within this paper, analysis was conducted to investigate the influence of build parameters on possible distortion during printing that affect the build accuracy. These parameters include the part orientation on the build plate, thickness change to the flanges and the positioning of the support structure of each part. The configurations are 3D printed using the SLM approach. The chosen material is IN625. The printed parts are 3D scanned and the results are compared to the original CAD design. The results confirmed the presence of distortions in printed parts and the effect of parameter changes. Furthermore, it was shown that improvements to the print parameters are necessary to achieve a satisfactory profile tolerance.

scholarly journals Three-dimensional Printing Versus Conventional Machining in the Creation of a Meatal Urethral Dilator: a Cost and Mechanical Strength Analysis

2020 ◽  
Author(s):  
Michael Yue-Cheng Chen ◽  
Jacob Skewes ◽  
Ryan Daley ◽  
Maria Ann Woodruff ◽  
Nicholas John Rukin
Keyword(s):  
3D Printing ◽  
Three Dimensional ◽  
Patient Specific ◽  
Strength Analysis ◽  
Fused Deposition Modelling ◽  
3D Printer ◽  
Current Time ◽  
Fused Deposition ◽  
3D Printed ◽  
Conventional Machining

Abstract BackgroundThree-dimensional (3D) printing is a promising technology but the limitations are often poorly understood. We compare different 3D printingmethods with conventional machining techniques in manufacturing meatal urethral dilators which were recently removed from the Australian market. MethodsA prototype dilator was 3D printed vertically orientated on a low cost fused deposition modelling (FDM) 3D printer in polylactic acid (PLA) and acrylonitrile butadiene styrene (ABS). It was also 3D printed horizontally orientated in ABS on a high-end FDM 3D printer with soluble support material, as well as on a SLS 3D printer in medical nylon. The dilator was also machined in stainless steel using a lathe. All dilators were tested mechanically in a custom rig by hanging calibrated weights from the handle until the dilator snapped. ResultsThe horizontally printed ABS dilator experienced failure at a greater load than the vertically printed PLA and ABS dilators respectively (503g vs 283g vs 163g, p < 0.001). The SLS nylon dilator and machined steel dilator did not fail. The steel dilator is most expensive with a quantity of five at 98 USD each, but this decreases to 30 USD each for a quantity of 1000. In contrast, the cost for the SLS dilator is 33 USD each for five and 27 USD each for 1000. ConclusionsAt the current time 3D printing is not a replacement for conventional manufacturing. 3D printing is best used for patient-specific parts, prototyping or manufacturing complex parts that have additional functionality that cannot otherwise beachieved.

Effect of Stator Variability on Axial Compressor Performance

2019 ◽  
Author(s):  
Kirubakaran Purushothaman ◽  
N. R. Naveen Kumar ◽  
Vidyadheesh Pandurangi ◽  
Ajay Pratap
Keyword(s):  
Guide Vane ◽  
Flow Analysis ◽  
Axial Compressor ◽  
Axial Flow ◽  
Low Pressure ◽  
Inlet Guide Vane ◽  
Jet Engines ◽  
Stator Blade ◽  
And Performance ◽  
Flow Compressor

Abstract Variability in stator vanes is a widely used technique to improve the stability and efficiency of axial flow compressor in gas turbine engines. Most of the modern aircraft jet engines use variable stator vanes in both low pressure and high pressure compressors primarily for off-design performance. This study discusses in detail about the effect of stator variability in a three stage low pressure axial compressor at design and off-design conditions. Computational flow analysis were carried out for the three stage low pressure compressor with variability in inlet guide vane and first stage stator blade. Detailed investigation on flow physics was carried out in rotor blade passages with stator variability. At off-design speeds, the reduction in flow velocity is lower than the reduction in blade tip speed. This leads to mismatch in flow angles and inlet blade angles causing high incidence and large flow separation in blade passage. This results in poor aerodynamic stability of the axial compressor at off-design speeds. In this study, aerodynamic performance of compressor is evaluated from 70% to 100% design speeds with different stagger angle setting of inlet guide vane at each speed. Further, to improve 2nd stage rotor performance, variability was introduced in 1st stage stator blade and performance was evaluated. Compressor test results are compared with CFD data for design and off-design speeds.

Model of the Plate Oxygen Cutting Taking into Account the Kinetics of Heterogeneous Oxidation Reaction

2014 ◽  
Vol 880 ◽  
pp. 199-204 ◽  
Author(s):  
Anna G. Knyazeva ◽  
Maria A. Anisimova
Keyword(s):  
Oxidation Reaction ◽  
Plate Thickness ◽  
Heat Losses ◽  
Model Surface ◽  
Heterogeneous Oxidation ◽  
Thickness Change ◽  
Treatment Zone ◽  
Kinetics Of ◽  
And Diffusion ◽  
Cutting Modes

This paper presents a mathematical model of oxygen cutting of the plate. It takes into account not only possible heat losses from the treatment zone, but also the heat release doe to the oxidation reaction. In turn, the oxidation leads to plate thickness change. The model allows analyzing the temperature distribution during the cutting process for different modes. The following cutting modes are revealed in the model: surface cutting, detail splitting, kinetic and diffusion regime.

scholarly journals Metal Ceramic Guide Vanes New Design Concept

1989 ◽  
Author(s):  
W. Krüger ◽  
W. Hüther
Keyword(s):  
Direct Contact ◽  
Guide Vane ◽  
Service Temperature ◽  
Jet Engines ◽  
Hot Gas ◽  
Metal Ceramic ◽  
Temperature Capability ◽  
Cooling Air ◽  
Bearing Structure ◽  
Sintered Silicon

With the aim of achieving a considerable reduction in the cooling air requirement of HPT nozzles of jet engines, a new guide vane concept which utilizes the high service temperature capability (≈1900 K) of sintered silicon carbide was proposed. In this concept, the load bearing structure of the vane is formed by the metallic shrouds and metallic core. The uncooled vane shell in SSiC, which floats in recesses in the shrouds, surrounds the vane core and projects the major metallic areas from direct contact with the hot gas. Straight cascades with 4 vanes of metal-ceramic construction were designed, manufactured and successfully rig-tested at 1800 and 1900 K.

scholarly journals 3D Printed Sand Tools for Thermoforming Applications of Carbon Fiber Reinforced Composites—A Perspective

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4639
Author(s):  
Daniel Günther ◽  
Patricia Erhard ◽  
Simon Schwab ◽  
Iman Taha
Keyword(s):  
Shell Structures ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Small Series ◽  
Innovative Idea ◽  
Carbon Fiber Reinforced Composites ◽  
3D Printed ◽  
Conventional Machining ◽  
Binder Jetting ◽  
Reduced Time

Tooling, especially for prototyping or small series, may prove to be very costly. Further, prototyping of fiber reinforced thermoplastic shell structures may rely on time-consuming manual efforts. This perspective paper discusses the idea of fabricating tools at reduced time and cost compared to conventional machining-based methods. The targeted tools are manufactured out of sand using the Binder Jetting process. These molds should fulfill the demands regarding flexural and compressive behavior while allowing for vacuum thermoforming of fiber reinforced thermoplastic sheets. The paper discusses the requirements and the challenges and presents a perspective study addressing this innovative idea. The authors present the idea for discussion in the additive manufacturing and FRP producing communities.

Thermal Barrier Coatings for Jet Engines

1988 ◽  
Author(s):  
F. C. Toriz ◽  
A. B. Thakker ◽  
S. K. Gupta
Keyword(s):  
Thermal Barrier Coatings ◽  
Guide Vane ◽  
Turbine Blades ◽  
Acid Leaching ◽  
Solid Particles ◽  
Thermal Barrier ◽  
Jet Engines ◽  
Barrier Coatings ◽  
Nozzle Guide ◽  
Work Done

Thermal barrier coatings (TBC) have been used in jet engine combustors for over 15 years. However, it is only recently that they have been actively used in the harsh turbine environment on nozzle guide vane platforms. It is intended to use TBCs on vane airfoils, and on rotating turbine blades where the maximum payoff will be realized. Much work has been done in the last five years towards this goal. Problem areas that need to be addressed are as follows: 1. Prevent coating failure due to: a. thermal cycling of the ceramic layer. b. oxidation of the bond coat. c. erosion due to gas stream solid particles. d. deposition of gas stream molten debris. e. acid leaching of coating phase stabilizers. 2. Minimize performance losses due to rough coatings. 3. Insure consistent high quality coatings. This report will review some of the work done by Rolls-Royce that would hopefully allow an increased use of TBCs on turbine components in the future.

scholarly journals Additive manufacturing casestudy and implementation strategy

2021 ◽  
Author(s):  
Aram Khosh Ettekal
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Implementation Strategy ◽  
Structural Integrity ◽  
Ongoing Research ◽  
Industrial Sectors ◽  
3D Printed ◽  
Manufacturing Technologies ◽  
Part Orientation ◽  
Printing Techniques

The following report has been created to provide a broad range of information on current additive manufacturing technologies, their present applications in commercial and industrial sectors and predictions for their future deployment in those sectors. The report also examines the ongoing research and development of a variety of 3D printing techniques. The review is divided into three sections. The first section is composed of one to two page summaries of academic journals, thesis papers, consultant perspective articles and company releases. Each individual summary provides a synopsis of the article, as well as what the authors foresee as the future implications of the topic they explored. The second section contains summaries and reviews of technical studies on various aspects of several different 3D printing technologies. Lastly the third section introduces implementation strategy for 3D printed components and presents a study that highlights the effect of part orientation on the structural integrity of the printed components.

scholarly journals The effect of varying specimens’ printing angles to the bed surface on the tensile strength of 3D-printed 17-4PH stainless-steels via metal FFF additive manufacturing

2021 ◽  
Author(s):  
Tawaddod Alkindi ◽  
Mozah Alyammahi ◽  
Rahmat Agung Susantyoko ◽  
Saleh Atatreh
Keyword(s):  
Electron Microscopy ◽  
Stainless Steels ◽  
Scale Up ◽  
Spare Part ◽  
Maximum Load ◽  
Fused Filament Fabrication ◽  
Elongation At Break ◽  
3D Printed ◽  
Part Orientation ◽  
Scanning Electron

AbstractWe fabricated 17-4PH stainless-steel specimens via Fused Filament Fabrication (metal FFF). Then, we studied the effect of varying specimens’ printing angles to the bed surface (part orientation) by analyzing the tensile test and scanning electron microscopy results. We found anisotropy, where specimens printed at 90° exhibited the lowest tensile-stress-at-maximum-load of 440.15 MPa and elongation-at-break of 0.83%, compared to specimens printed at 0° of 947.26 MPa and 2.98%, respectively. We recommend printing angles from 0° to 10° to achieve optimum tensile strengths. This study is significant in ensuring quality for the deployment and scale-up of spare-part production via metal FFF. Graphic abstract

Application of acoustic metrology for detection of plate thickness change

Measurement ◽  
1996 ◽  
Vol 18 (4) ◽  
pp. 207-214 ◽  
Author(s):  
J.G. Cherng ◽  
X.F. Chen ◽  
Victor Peng
Keyword(s):  
Plate Thickness ◽  
Thickness Change
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