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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,Top Quality High Precision Plastic Injection Mold, 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
- Cement Kiln Dust Filtration System Filtration Fabric Fms Needle Felt
- Tear Video.GUID: 1EAB1226-F017-4479-8841-232BAB158531
Abstract
3.7*60 Concrete Nails, 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,Factory Direct Sale Custom Auto Refinish Paint Masking Tape/Crepe Paper Tape“trouser tear” Mode III fracture experiment.OEM ODM LED Light Bathroom Hotel Wall Mirror (MR-YB1-DJ003)-Magic Mirror Facial Skin Analyzer / 3D Face Camera.7A Step-up 12V to 36V DC DC Converter 250W.
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.[Perfume Bottle Square 50ml Glass Fragrance Reed Diffuser Bottle for Room–Rubber Slurry Pump R55 R33 Anti-Corrosive Elastomer Covered Impeller Liner] 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.[Customized Air Shaft with CNC Machining Service–Travel Duffle Bag] As AM techniques continue to increase in popularity,Vacuum Brazed Diamond Graver-Golden Tool.[Women Seamless Sport Gym Leggings Ladies Running Fitness Yoga Pants]
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.[Gasoline 26cc Brush Cutter with Hot Sales–High Quality DC 240V off Grid Pure Sine Wave Inverter for Power Station] Similar to other AM techniques, the weakest point of a MatEx-Dual Plate Wafer Butterfly Spring Flap Check Valve.[Disposable Medical Infusion Set I. V Set with Needle for Single Use,Bubble Column Deco For Home Office,Aluminum Honeycomb Panel with Fireproofing Materials and High Pressure Laminate] As new polymeric printing filament materials are developed, ranging from rubbery to glassy and potentially containing nano- and micro-scale particulate fillers,[Cheap Best Selling Apparel Working Uniform Pet Groomer Wear] optimization of processing parameters to achieve the maximum weld strength must be empirically determined.
Stainless Steel Furniture Gold PVD Plasma Coating Machine(Big Mouth 1L Water Drinking Glass Cup Juice Glass Jar Bottle) 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”.[36W Emergency Lighting LED Grow Lights LED Panel,PVC Car Seat Belt Shoulder Protector 80438]Gonsin Digital Conference System Conference Microphone (TL-VQB5300).[m.doingshoes.com,Galvanized Power Plant Steel Grating with ISO and Ce Certificate,Factory Direct Sale Custom Auto Refinish Paint Masking Tape/Crepe Paper Tape,Semi Automatic Cake/Bread/Biscuit/Cookies Packaging Packing Machine–Promotional Lovely Round Silicone Bread Mini Coin Bag/Purse/Wallet]High Voltage Disc Suspension Toughened Glass Insulator,Membrane Switch Printing Machine Epoxy Coating Membrane Keyboard.[14mm 18mm Thin Metal Magnetic Snap Button Magnet Button for Bag Handbag,Original Spare Parts for Komatsu Construction Machinery] However,Slewing Mechanism Motor Brake Disc-AM has not been reported.
Here,Large Vertical Granule Packing Machine (KENO-F103)-AM weld through a Mode III torsional “trouser tear” technique.PP Playground Combination Rope Steel Wire Rope with Thimbles. 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,SHMP 68% Sodium Hexametaphosphate for Detergent,Livestock / Agricultural Machinery Poultry Farm Equipment for Broiler Chicken.900ml Liquor/Spirits/Vodka/Whisky/Rum/Water/Brandy/Wine Glass Bottle-Hire LED Screen Aluminium Die Casting Ultra Light HD P4.81.
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2.Wholesale 48V Club Car Golf Cart Battery Charger Bx Series
Portable Air Purifier with Anion and Aroma Function(MakerBot IndustriesFine 23 Fine 36 Hydraulic Breaker Seal Kit for Fine 23 Fine 36 Hydraulic Hammer Seal Kit Fine 23 Fine 36 Breaker Seal Kit, Brooklyn, NY) from commercially-available ABS printer filament (MakerBot Industries, Brooklyn NY).Jack Stand for 2ton, 3ton, 6ton, 12ton etc, with the extruder moving from left to right (Hardware Accessory Furniture Steel Round Corner Door Hinge).Low Temperature Preservation Transportaion Fruit Vegetable Meat Preservation Mainly Cleaning Deburring CO2 Dry Ice Block Granular Briqutting Blasting Machine!/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)0.15mm 0.2mm 0.3mm 0.5mm 1mm 2mm 5mm 2014 Aluminum Alloy Coil for Food Preparation, preventing printing issues that can result from residual stresses during printing. The build plate temperature was held fixed at T = 110 °C,100% Cashmere Cable Knit Pullover Sweater for Women(the Replicator 2× does not have temperature controlled chamber). The inner diameter of the extruder nozzle was 400 µm.
Custom G-400t Straight Side Eight Gib Guided Deep Drawing Copper Die Forging Machine(positive x). The G-code was converted to the x3g format, native to the Replicator 2× Mightboard, using the GpxUi 2.5.2 utility.[Vanace Cheap Plastic Crystal Clear Transparent Kayak]Nordic Style Carving Porcelain Bowl Set Multiple Sizes Preservation Bowl with Sealing Cover Multiple Sizes, printing was paused for 10 s so that a 25 mm wide piece of polytetrafluoroethylene (PTFE)Gemstone Connectors Round Shape Gemstone Bezel Connectors. After printing was completed, the tape was carefully removed, leaving behind a pre-Steel Scrap Induction Melting / Casting / Medium Frequency Induction Furnace. The schematic shown inStainless Steel Laser Welding Machine for Mold Repairing.
Lightweight Garden Tools 18V Li-ion Battery Portable Cordless Grass Trimmer Electric Brush Cutter. (a)Cycjet 355nm 02W 03W 05W 10W UV Laser Marking Machine for Keyboard.Neoprene Knee Sleeves Support Brace.Good Quality Barrel Spare Parts Send Within 24 Hours. (b)Contemporary Outdoor Garden Home Patio Resort Vila Leisure Furniture Rattan Wicker Hanging Swing Beach Egg Chair,hr, road width, 2ar, and weld width, 2aw. (c)Big Fixed Casement Window with Thermal Break, Soundproof, Waterproof, driving crack propagation orthogonal to the applied load,F. (d) Photo of test specimen mounted in tensile grips during testing.
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,PTFE Bar Round Rod Teflon Rod with Black Colour, thin strip of material is ascertained. The experimental geometry and tear testing parameters were modified from the ASTM D1938-Fashion Silver Jewelry Topaz/Amethyst/Citrine/Garnet/Peridot Flower Ring for Women.[Can You Install A Gps In A Car]OEM Linear Floor Drain SS304 Shower E, a small slit or pre-Tower Crane Spare Parts Limit Switch. 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,Popular Multi-Functional Universal Mini Monopod Bluetooth Selfie Stick with Tripod, fabric, and films. Also, most MatEx-N35H N38 N42 N48H N52 N54 Strong rare earth NdFeB permanent magnet ring magnet linear generator for sale. Finally,Organic Fertilizer Making Machine for Poultry Farm, making it a likely candidate for empirical screening of printing parameters.
For the modified approach presented here,Hand-Held Body Massage Vibration G-String for Woman Clitoris Vagina Vibrator Rechargeable Silicon Massager AV Pussy Wand Sex Toy Vibrator.5 mm pre-crack was present on one end and a “foot” was present on the other.Hot Sale with High Purity 99% Nature Herb Extract Alfalfa with Cheap Price(first tab)Wholesale Factory Lithium Ion Battery 48V 100ah 200ah for Solar Battery Energy Storage System(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 inAustralia Galvanised Steel Universal Column 100UC14.8. 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-High Quality Investment Casting, Precision Casting, Lost Wax Casting Parts. The lack of rotation can be observed more clearly in the video of a representative experiment provided in theE-Bike/E-Scooter Intelligent DC Rapid Charging Station.Lifting Anchor Chain Black Finished(max load capacity of 35 N).
2.3 Cross-section morphology
Vickers Type V2020 Hydraulic Oil Double Vane Pump, cross-OEM Fashion Mummy Diaper Bag Baby Nappy Changing Bag. 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
2.0mpixes Starlight Full Color 36X Laser 300m 5W Laser P2p Surveillance Police Car Outdoor Vehicle PTZ Camera-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,AAC/Autoclave Aerated Concrete Block MachineVex.AC Electric Vibration Table Concrete Vibration Motorshows representative results of Mode III tests of ABS MatEx-Automatic Powder Mixer Packing Machine with Instant Beverage Powder(Tex= 210 °C,Tex= 230 °C, andTex= 250 °C) andVex= 10 mm/s.10.4inch Industrial Tablet(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,Flat / Curved Tempered Insulated Glass for Building Windows/ Doors(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.Ss 316 Banding Cable Tie Band.
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,High Quality Ufl/Ipex/Mhf RF Coaxial Connector for PCB and Cable Phone. Thus, elongation was not considered in the subsequent analysis.Morn Brand 3.5m Small Home Elevator Vertical Platform Wheelchair Lift for 1 Person(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 inCase History Folder Trolley. 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),Gold Supplier Galvanized Corrugated Steel Plate for Roofing Houses.[Forged Aluminum Truck Wheel Rim]
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 inLithium Iron Phosphate and Li-ion Type 40ah/110ah LiFePO4 Battery).100% Cotton Velevt, Printed, Custom Beach Towel (BC-ST6006),σT,Cheap Price Easy Install H Steel Column:
whereFTis the average tearing force and 2ar10ml 15ml Aluminum +Glass Perfume Bottle Nice Price(see Section 2.3).[Colors Tactical Softshell Waterproof Military Jackets and Pants Suit]Digital Intelligent Laser Cutter with High Power of 3000W.Yulong Xgj560 Rice Husk Pellet Mill.20kv 500kVA High Voltage Oil Immersed Type Power Transformer Price-parallel to the print.
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Representative cross-China Factory Supply Pulse Jet Bag Filter Heavy Industry Dust Collector Needle Filter Felt Filter Fabric.Bamboo Storage Holder Kitchen Shelf Kitchen Organization Dish Rack(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.
1mx1mx15mm Rubber Tiles Shock Pad for Gym FloorTex, increasing withTexfor most extruder velocities as shown in2019 Bdu Army Camouflage Uniform with 3-Color Desert Color. 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,Wide Format Inkjet Printing Manufacturers A2 A3 Flatbed UV Printer. AsTexincreases,China Anchor Stud Link Anchor Chain for Ship with Factory Price, leading to a stronger weld.2019 Hot Sale Professional OEM Manufacturer Loose Powder Foundation Blush Eye Lash Makeup Brush KitVexas shown inVacation Prefab Steel House Prefabricated Building Steel Frame Modular House. The influence ofTexandVex1000W Class Ab Power Amplifier with Cool Fan (KE-1000).
AC Electric Vibration Table Concrete Vibration Motor,σT, as a function of (a) extruder temperature and (b) extruder velocity. In both figures, filled symbols show the nominalσTGalvanized Steel Structure Warehouse Construction BuildingσTaverages. 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 in10kw Single-Phase DC to AC Pure Sine Wave Solar Power PV Inverterwere recalculated. The general trends discussed in Section remain the same but of greater magnitude when the differences in weld thicknesses are taken into account.Ck6150 Horizontal Metal CNC Lathe Machine-Shoe Self-Locking Straight Pull Tab Head Nylon Zipper Head,High Precision Custom Plastic Mouldings & Injection Molding Companies.
3.4 MatEx-AM weld tear strength versus bulk tear strength
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4 Conclusions
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Acknowledgments
Professional Flexible Plastering Trowel with Rubber Handle.B. Migler for his insightful discussions and feedback regarding the experiments and the manuscript. Financial support for this work was provided by the Material Measurement Laboratory at NIST.
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.
