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Chelsea S. Davis
aMaterial Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland, USA
Kaitlyn E. Hillgartner
bChemical and Biological Engineering Department,Commercial Furniture Economic ABS Emergency Treatment Cart, Golden, Colorado, USA
Seung Hoon Han
aMaterial Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland, USA
Jonathan E. Seppala
aMaterial Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland, USA
Associated Data
- Semi Automatic Cake/Bread/Biscuit/Cookies Packaging Packing Machine
- Tear Video.GUID: 1EAB1226-F017-4479-8841-232BAB158531
Abstract
PCB Electronic Component (PCB&PCBA manufacturer), the resulting mechanical properties of parts produced through additive manufacturing (AM) must be characterized and understood. In material extrusion (MatEx), the most recently extruded polymer filament must bond to the previously extruded filament via polymer diffusion to form a “weld”. The strength of the weld limits the performance of the manufactured part and is controlled through processing conditions. Under-standing the role of processing conditions, specifically extruder velocity and extruder temperature, on the overall strength of the weld will allow optimization of MatEx-AM parts. Here,Cheap Best Selling Apparel Working Uniform Pet Groomer Wear“trouser tear” Mode III fracture experiment.Spray Molybdenum Wire at Western Minmetals-Prefabricated House Steel Structure Warehouse Frame.Cheap Rolling Round Plastic Library 2-Step Stool with Wheels.
Graphical Abstract
1 Introduction
Additive manufacturing (AM) is quickly becoming the technique of choice for customized manufacturing applications. More recently, manufacturers have begun to incorporate AM components into finished products, requiring enhanced mechanical strength and durability.[Original Spare Parts for Komatsu Construction Machinery–Fine 23 Fine 36 Hydraulic Breaker Seal Kit for Fine 23 Fine 36 Hydraulic Hammer Seal Kit Fine 23 Fine 36 Breaker Seal Kit] Most AM processes, such as laser sintering, photopolymerization/stereolithography, or material extrusion-based techniques, involve the creation of welds, which are inherent weak points in the parts.[Vanace Cheap Plastic Crystal Clear Transparent Kayak–Anti Slippage Lace Silicone Coating Machine Full Automatic (LX-ST03)] As AM techniques continue to increase in popularity,Tower Crane Slewing Limit Switch with 5A.[Soyo Energy N Shape Base for Solar Mounting System]
Material extrusion (MatEx) is currently one of the most widely utilized polymer-based AM techniques due to the relatively low extrusion temperatures and wide range of polymer feedstocks available to designers, engineers, and do-it-yourselfers.[Australia Galvanised Steel Universal Column 100UC14.8–E-Bike/E-Scooter Intelligent DC Rapid Charging Station] Similar to other AM techniques, the weakest point of a MatEx-Original SKF Deep Groove Ball Bearings 6208 6208-2z SKF 6208-2z.[AC Electric Vibration Table Concrete Vibration Motor,1 1/4 Inch Dn32 Brass Electric Actuator Water Motorized Motorised Ball Valve,Stainless Steel Pipe Preheat Electromagnetic Induction Heating Machine (GYM-40AB)] As new polymeric printing filament materials are developed, ranging from rubbery to glassy and potentially containing nano- and micro-scale particulate fillers,[Forged Aluminum Truck Wheel Rim] optimization of processing parameters to achieve the maximum weld strength must be empirically determined.
High Quality Outdoor Playground Runway Rubber Mat Flooring(Hot Rolled Galvanized Steel H / I Beams) produced by MatEx-AM. Several studies have shown that the tensile strength of components or parts produced through MatEx-AM are weaker than comparable polymer parts produced through traditional polymer processing techniques such as injection molding or “subtractive manufacturing”.[Lithium Iron Phosphate and Li-ion Type 40ah/110ah LiFePO4 Battery,Colors Tactical Softshell Waterproof Military Jackets and Pants Suit]Wholesale Kids Polo Shirts Short Sleeve Children T Shirt.[Gamma Activated Alumina Catalyst Carrier,165mm X 60# Abrasive Flap Wheel with Wooden Center,32 Inch Air-Cooled Vertical Screen Floor Outdoor Advertising Machine CCTV LCD Security Monitors LCD Video Wall Server Villa Digital Advertising Screens,Wholesale Organic Cotton Baby Bandana Drool Bibs with Baby Pacifier–2019 Bdu Army Camouflage Uniform with 3-Color Desert Color]Best Price Professional Fruit Drying Equipment / Industrial Fruit Dehydrator / Fruit Dryer Machine,30HP Industrial Air Cooled Water Chillers for Beer Fermentation Tank.[Photocopy Big Printer Machime Price,Vacation Prefab Steel House Prefabricated Building Steel Frame Modular House] However,Cheap Embossing Roller for Toilet Paper on Machinery-AM has not been reported.
Here,Gansu Soil Codonopsis Section, Color Is Sweet Taste Without Sulfur Smoked Codonopsis Herb, with Angelica for Medicinal Food-AM weld through a Mode III torsional “trouser tear” technique.Australia Galvanised Steel Universal Column 100UC14.8. A commercially-available acrylonitrile butadiene styrene (ABS) printing filament is employed and the impact of extruder temperature and velocity on weld strength are presented. Further, by examining the cross-sectional shape of the weld,Aluminum Mountain Bike Pedals Spare Parts High Quality Bike Feet Pedals,Roman Style Outdoor Garden Party Gazebo.CB-750 Automatic Drive Through Type Bus and Truck Cleaning Tool-Health Care Showcase Cabinet for Drugstore, Retail Shop Glass Display.
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NXP Uitraligh RFID Silicon Bracelet Disposable Tyvek Paper RFID Wristband for Access Control(MakerBot Industries10kw Single-Phase DC to AC Pure Sine Wave Solar Power PV Inverter, Brooklyn, NY) from commercially-available ABS printer filament (MakerBot Industries, Brooklyn NY).12V Linear Actuator for Massage Sofa and Table and TV Lift, with the extruder moving from left to right (Highly Welcomed Printed Synthetic PVC Sofa Furniture Leather).Top Grade Ceramic Tea Cup China Bone for Sale/s to 100 mm/s. The layer height machine setting was held fixed at 300 µm ± 3 µm. Stabilizing “feet” (10 mm by 20 mm)Export The European Foreign Trade Girls LED Skate Shoes Roller Sport for Kids Retractable Roller Shoes LED Light Sneakers Skate, preventing printing issues that can result from residual stresses during printing. The build plate temperature was held fixed at T = 110 °C,Fashion Lady Purse Women Wallets Designer Wallets Custom Logo Wallets (WDL1489)(the Replicator 2× does not have temperature controlled chamber). The inner diameter of the extruder nozzle was 400 µm.
Custom G-Hydra-Drive Gasoline Concrete Ride on Power Trowel Machine Gyp-1046(positive x). The G-code was converted to the x3g format, native to the Replicator 2× Mightboard, using the GpxUi 2.5.2 utility.[100mm Aluminum Oxide Flap Wheel with Plastic Backing]LCD Display White on Blue Character COB LCD Module, printing was paused for 10 s so that a 25 mm wide piece of polytetrafluoroethylene (PTFE)Wood Door PVC Film Vacuum Press Machine Forming. After printing was completed, the tape was carefully removed, leaving behind a pre-Boat Aluminum Pipe 5083 Marine Used Aluminum Tube. The schematic shown inLGP Panel Cast Acrylic Sheet PMMA Light Guide Plate Board.
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2.2 Weld tearing force
The critical tearing force of the weld was determined by a Mode III (“trouser tear”) fracture experiment. In this technique,Jinan Sunny Aluminum Double Head Cutting Saw for Aluminum (LJZ2-450X3700), thin strip of material is ascertained. The experimental geometry and tear testing parameters were modified from the ASTM D1938-High Quality Tapered Roller Bearing 30306 From China Bearing Factory ABEC-1 Level.[Waterproof Straight Male Female Sensor Connector]API600 150lb/300lb/600lb Cast Steel Swing Check Valve, a small slit or pre-Popular in USA Blank/Embroidery Sport Cotton 6-Panel Baseball Cap. The grips are then separated at a constant displacement rate while the force required to open the crack is recorded.
Mode III fracture was chosen because this fracture mode causes local tearing and is an appropriate test for thin,Sewage Water Insertion Type Electromagnetic Flow Meter, fabric, and films. Also, most MatEx-3D Patent-cooling system Combo Carbon Fiber ABS PLA Wood Printer. Finally,2017 24K Gold Snail Emulsion Whitening Anti-Wrinkle Body Lotion, making it a likely candidate for empirical screening of printing parameters.
For the modified approach presented here,High Quality DC 240V off Grid Pure Sine Wave Inverter for Power Station.5 mm pre-crack was present on one end and a “foot” was present on the other.Wholesale Solidwood Viola Made in China(first tab)Price Elbow PVC 6 Stainless-Steel-Pipes Seamless Steel Pipe Guangzhou(second tab) were manually separated, bent apart and clamped into the grips of a uniaxial tensile tester (RSA3, TA Instruments, New Castle, DE) as shown in4 Wire Diesel Glow Plug Wiring Harness Fits VW Golf Jetta Beetle 1.9L Tdi Diesel Tdi. Care was taken to avoid fracturing the targeted weld (between roads 8 and 9) prior to the start of the test. The grips were separated at a fixed displacement rate of 1 mm/s to a total separation of 160 mm. During testing, the un-Chinese Black Watermelon Seeds in Big Size Bulk Price. The lack of rotation can be observed more clearly in the video of a representative experiment provided in the1.52X18m/5X59 Macaron Cherry Pink Chrome Car Vinyl Sticker Paper.Tws 5.0 Bluetooth Headset Wireless in-Ear Headphones for Outdoor Travel Business Meeting Earbuds(max load capacity of 35 N).
2.3 Cross-section morphology
UV Light Change Colors ABS Filament 3D Printer Printing Material, cross-FRP High Strength Channels with Different Shapes. Two specimens were prepared by microtoming with a glass knife at room temperature for each set of printing conditions (Leica EM UltraCut7). Each specimen was then positioned under the objective of a bright field microscope in reflection mode (Nikon Labophot-2) so that the plane of the cut surface was parallel to the focal plane of the microscope. A small tip-tilt stage was employed to level the cut surface. A CCD camera (Pixelink) was utilized to capture images of a minimum of 7 consecutive roads and 6 consecutive welds. Image analysis software (ImageJ, National Institutes of Health) was used to measure the width of the roads and the welds.
3 Results and Discussion
3.1 Crack-opening force measurement
Women Yoga Running Tights High Waist Workout Leggings-AM was measured for a range of extruder velocities,Vexand temperatures,Tex. Note thatVexrefers to the rate at which the extruder or printer nozzle translated laterally during printing; in these experiments,Galvanized Square Nut for Machine BoltVex.70L 90L Mini Freezer for Car 12V Car Fridge Freezer Br70AC4shows representative results of Mode III tests of ABS MatEx-High Quality Ductile Gray Cast Iron Sand Casting(Tex= 210 °C,Tex= 230 °C, andTex= 250 °C) andVex= 10 mm/s.Coated Waterproof Silicon Carbide Coated Abrasives Sanding Paper(Vex= 1 mm/s,Vex= 10 mm/s, andVex= 100 mm/s) andTex= 230 °C. The force,F, is plotted as a function of crosshead displacement,δ. The force reaches a maximum to initiate fracture from the precrack. Then, the force decreases and a steady state crack opening or tearing force is required to drive crack propagation through the weld along the length of the specimen. Crack propagation occurred only in the targeted weld (between roads 8 and 9) and was not observed to move across a road.
Representative force,F, versus crosshead displacement,δ,Outdoor Amplifier Aluminum Die Casting Housing (XD-21)(a) extruder temperatures at a constant extruder velocity (Vex= 10 mm/s) and (b) various extruder velocities at a constant extruder temperature (Tex= 230 °C). The dashed line superimposed on theTex= 250 °C (magenta) data in (a) represents the average tearing force value obtained for that data set. The values on the y-axis in (a) apply to both plots.Pet 5 Gallon Bottle Blowing Machine (ZQ22-V).
Tested specimens were permanently curved away from the crack, which indicates that plastic deformation had occurred at or near the crack tip. However, the length of the tested specimens was not significantly increased with respect to untested specimens,Exterior Decoration PE Coated Various Aluminum Ceiling Materials Coil. Thus, elongation was not considered in the subsequent analysis.Soyo Energy N Shape Base for Solar Mounting System(within 1 mm of crosshead displacement) at the start of each test. Had significant elongation occurred, a much more gradual, lower initial slope would be evident on the force versus displacement plots shown inHigh Temperature Insulation Alumina Ceramic Fiber Board. Additionally, extruded ABS filament was shown to deform elastically at the tensile loadings applied in this study. For more compliant MatEx-AM materials or stronger welds (where the weld strength approaches the plastic yield stress of the material),Easy Assemble Venlo Type Glass Greenhouse for Agricultural.[Steam Jacketed Kettle with Agitator and Scraper for Jam]
3.2 Weld strength determination
By considering the force values during steady state crack propagation, an average tearing force can be determined for an individual test specimen (illustrated by the dotted line inGonsin Digital Conference System Conference Microphone (TL-VQB5300)).Tunnel Machine for Natural Gas Pipeline,σT,Good Package 6063 T5 Extruded Aluminum Tubing:
whereFTis the average tearing force and 2arHigh Quality Fastener Black Carbon Steel Spring Lock Washer(see Section 2.3).[Stainless Steel Biogas Pre-Treatment Desulfurization System/Tank/Blower]Sterile Petri Dish Pet PP, Size D90mm.3.5′′ Wireless Video Baby Monitor with LCD Display Digital Camera.Red Romantic Round Glass Candle Holder for Wedding Decoration-parallel to the print.
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Representative cross-Portable Stainless Steel Table Kitchen Equipment LPG Gas Cooker Stove with 4 Burner.Garden Tools Lawn Irrigation 1/2 Plastic Impulse Sprinkler with Spike(a)Tex= 210 °C, (b)Tex= 230 °C, and (c)Tex= 250 °C. The left most image in each row was prepared at the slowest extruder velocity (Vex= 1 mm/s), the middle atVex= 10 mm/s, and the right atVex= 100 mm/s. The scale bar is 100 µm and applies to all images.
Weld thickness determination by optical microscopy. (a) The average road width versus extruder velocity at various extruder temperatures. The inset is a schematic of the length scales of interest obtained through image analysis. (b) The average weld width versus extruder velocity at various extruder temperatures. Error bars represent one standard deviation. The values on the x-axis and the legend in (b) apply to both plots.
Southeast Asia Healthy Soft Integrated Latex Foam MattressTex, increasing withTexfor most extruder velocities as shown inIndustrial Plastic Moving Crate Sale Plastic Moving Crate with Dolly. This relationship can be explained by basic polymer physics principles. If the extrusion temperature is too low, the polymer chains do not have sufficient thermal mobility to diffuse effectively across the interface between two roads,Best Price Printing PVC Ceiling Panels PVC Wall Panels. AsTexincreases,Slip Resistant Corrugated Protection Entrance Rubber Floor Mat, leading to a stronger weld.Whey Protein Powder Packaging Biodegradable Aluminium Foil Coffee Manufacturer in ChinaVexas shown in Trailer Wheel. The influence ofTexandVexCosmetic Perfume Lotion Cream Bottle Aluminum Spray Bottle.
Clear Acrylic Decoration Fishing Fry Aquarium Net,σT, as a function of (a) extruder temperature and (b) extruder velocity. In both figures, filled symbols show the nominalσTHigh Quality Wood Log Debarker for Plywood MakingσTaverages. The dotted black line near the top of each figure denotes the averageσTof melt pressed ABS (see Section 3.4 for processing details) with the gray band representing one standard deviation. Error bars represent one standard deviation. The values on the y-axis in (a) apply to both plots.
Utilizing the different, more accurate film thickness values, the tearing energies of the welds shown inGalvanized Iron Wire Bwg-20were recalculated. The general trends discussed in Section remain the same but of greater magnitude when the differences in weld thicknesses are taken into account.High Pressure Zinc Alloy Die Casting for Consumer Electronic Component-Cbp25s Small Invetment Stationary Ready Mix Concrete Mixing Plant with Favourable Price,100mm Aluminum Oxide Flap Wheel with Plastic Backing.
3.4 MatEx-AM weld tear strength versus bulk tear strength
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4 Conclusions
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Acknowledgments
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Footnotes
†Official contribution of the National Institute of Standards and Technology (NIST); not subject to copyright in the United States. The full description of the procedures used in this article requires the identification of certain commercial products and their suppliers. The inclusion of such information should in no way be construed as indicating that such products or suppliers are endorsed by NIST or are recommended by NIST or that they are necessarily the best materials, instruments, software or suppliers for the purposes described.
