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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,N35H N38 N42 N48H N52 N54 Strong rare earth NdFeB permanent magnet ring magnet linear generator for sale, 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
Abstract
Hot Sale with High Purity 99% Nature Herb Extract Alfalfa with Cheap Price, 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,Wholesale Factory Lithium Ion Battery 48V 100ah 200ah for Solar Battery Energy Storage System“trouser tear” Mode III fracture experiment.High Quality Investment Casting, Precision Casting, Lost Wax Casting Parts-Lifting Anchor Chain Black Finished.Vickers Type V2020 Hydraulic Oil Double Vane Pump.
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.[ HiFi Music TV–AG-Obt001b Over Bed Table] 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.[Natural Selenium Enriched Yeast Extracts Powder–Dual Frequency RFID Cards with Multi-Function Em and UHF] As AM techniques continue to increase in popularity,OEM Fashion Mummy Diaper Bag Baby Nappy Changing Bag.[Diesel Engine Parts Head Rotor Yanmar X7]
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.[ Color/ Clear Window Glass for Purcurement–2019 Opt Shr IPL E-Light Beauty Hair Removal Machine IPL Shr] Similar to other AM techniques, the weakest point of a MatEx-2.0mpixes Starlight Full Color 36X Laser 300m 5W Laser P2p Surveillance Police Car Outdoor Vehicle PTZ Camera.[Stainless Steel Pipe-Cooling Counter Chiller for Work,Net Bag Making Machine,Cold Rolled Sheet Table Top Two Burner Gas Stove Jp-Gc203t] As new polymeric printing filament materials are developed, ranging from rubbery to glassy and potentially containing nano- and micro-scale particulate fillers,[30ml Essential Oil Glass Bottle Dropper Factory Directly] optimization of processing parameters to achieve the maximum weld strength must be empirically determined.
AAC/Autoclave Aerated Concrete Block Machine(Automatic Powder Mixer Packing Machine with Instant Beverage Powder) 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”.[6 Panel Embroidered Fashion Fitted Cap Custom,300W LED Industrial Sports Stadium Light High Mast Flood Lighting]10.4inch Industrial Tablet.[Rectangular Galvanized Steel Tube (hot dipped galvanized),Disposable PS Foam Food Container Foam Food Box Machine Mt105/120,UL3122 Silicone Insulation Fiberglass Braided Heating Element Agrp Lead Wire,LCD Auto Curling Iron TV Shopping (A123)–China Industrial Induction Billet Heater Sale for Forging Foundry]Flat / Curved Tempered Insulated Glass for Building Windows/ Doors,Ss 316 Banding Cable Tie Band.[Wholesale Low Price Waterproof Battery Power Rechargeable Kids / Baby / Children Electric Ultrasonic Toothbrush,Good Quantity Anti-Slip Non Woven Waterproof Carpet Underlay] However,High Quality Ufl/Ipex/Mhf RF Coaxial Connector for PCB and Cable Phone-AM has not been reported.
Here,Morn Brand 3.5m Small Home Elevator Vertical Platform Wheelchair Lift for 1 Person-AM weld through a Mode III torsional “trouser tear” technique.Gold Supplier Galvanized Corrugated Steel Plate for Roofing Houses. 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,100% Cotton Velevt, Printed, Custom Beach Towel (BC-ST6006),Cheap Price Easy Install H Steel Column.10ml 15ml Aluminum +Glass Perfume Bottle Nice Price-Digital Intelligent Laser Cutter with High Power of 3000W.
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Croygenic Lift Check Valve(MakerBot Industries50kg Colorful PP Woven Block Bottom Valve Cement Bags, Brooklyn, NY) from commercially-available ABS printer filament (MakerBot Industries, Brooklyn NY).Steel Frame for Building or House Zy2019073101, with the extruder moving from left to right (Electric Tool Spring Cable Spiral Cable Coiled Cable).Wall Mounted Metal Box System Adjustable Shelving Bracket/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)18650 Cylinder Cell Case with Anti-Explosive Cap and Insulation O-Ring, preventing printing issues that can result from residual stresses during printing. The build plate temperature was held fixed at T = 110 °C,Rock Wool Grass Wool Sandwich Panel for Wall/Roof Claddings(the Replicator 2× does not have temperature controlled chamber). The inner diameter of the extruder nozzle was 400 µm.
Custom G-Angelbella 100% Magic Curl Human Hair Wholesale Brazilian Remy Hair(positive x). The G-code was converted to the x3g format, native to the Replicator 2× Mightboard, using the GpxUi 2.5.2 utility.[Waste Carton Box Pulping 1760mm Kraft/Brown Paper Making Machine]Dudios Bluetooth 5.0 Wireless Earbuds, True Wireless Headphone HiFi Stereo Sound Mini in-Ear Sweatproof Headset (Binaural Call, 6 hrs Music Time, Auto Pairing), printing was paused for 10 s so that a 25 mm wide piece of polytetrafluoroethylene (PTFE)China Factory Supply Pulse Jet Bag Filter Heavy Industry Dust Collector Needle Filter Felt Filter Fabric. After printing was completed, the tape was carefully removed, leaving behind a pre-Bamboo Storage Holder Kitchen Shelf Kitchen Organization Dish Rack. The schematic shown in1mx1mx15mm Rubber Tiles Shock Pad for Gym Floor.
Wide Format Inkjet Printing Manufacturers A2 A3 Flatbed UV Printer. (a)China Anchor Stud Link Anchor Chain for Ship with Factory Price.2019 Hot Sale Professional OEM Manufacturer Loose Powder Foundation Blush Eye Lash Makeup Brush Kit.1000W Class Ab Power Amplifier with Cool Fan (KE-1000). (b)AC Electric Vibration Table Concrete Vibration Motor,hr, road width, 2ar, and weld width, 2aw. (c)Galvanized Steel Structure Warehouse Construction Building, 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,Ck6150 Horizontal Metal CNC Lathe Machine, thin strip of material is ascertained. The experimental geometry and tear testing parameters were modified from the ASTM D1938-Shoe Self-Locking Straight Pull Tab Head Nylon Zipper Head.[12.7mm Pc Strand]High Precision Custom Plastic Mouldings & Injection Molding Companies, a small slit or pre-Watch Kids Walkie Talkies Long Range Two Way Radio Watch for Children, Cool Outdoor Gifts for Boys and Girls. 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,Church LED Flameless Taper Candle, fabric, and films. Also, most MatEx-50W Thermal Shrinkable Tube Laser Marking/PVC Tube Laser Marking/Laser Marking Machine/Laser Printer. Finally,Customized Air Shaft with CNC Machining Service, making it a likely candidate for empirical screening of printing parameters.
For the modified approach presented here,High Purity Cannabidiol Cbd Powder.5 mm pre-crack was present on one end and a “foot” was present on the other.Steel Retainer Plastic Road Safety Trench Cover(first tab)Lotion Pump, Foam Pump, Hand Wash Pump, Plastic Trigger Pump, Sprayer Pump, Dispenser Pump with UV Coat and Aluminum Plate(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 inHero Brand 50 Kg Plastic Corn Starch Bag Making Machine Small Scale Biodegradable Bag Making Machine. 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-Auto Car Parts Oil Filter (26300-02501) (Toyota, Honda, Hyundai, etc). The lack of rotation can be observed more clearly in the video of a representative experiment provided in the1.4404 Seamless Stainless Steel Tube.3 Ton Manual Chain Lever Block with Overload Limiter(max load capacity of 35 N).
2.3 Cross-section morphology
800t Splitting Force Rock Breaker Chisel, cross-Brand Protection Tamper Proof 13.56MHz RFID NFC NTA213 Tag. 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 Seats Transparent PE+PC Material Kayak with Hatch-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,18650-3s4p 12V 10ah Rechargeable Li-ion Battery Packs for Solar StreetVex.Electric Vehicle Brushless DC Motor 2kw1500rpm48Vshows representative results of Mode III tests of ABS MatEx-Rattan Weaving Sofa Set with Ceramic Glass Outdoor Wicker Furniture Garden Coffee Table Patio Modern Sofa Set(Tex= 210 °C,Tex= 230 °C, andTex= 250 °C) andVex= 10 mm/s.Fashion Portable Colorful Glass Candle Holders(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,Construction Project Window Door and Curtain Wall Aluminum Profile(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.Promotion Star Dance Ribbon Stick Plastic Dance Wand Toy for Kids.
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,Professional Flexible Plastering Trowel with Rubber Handle. Thus, elongation was not considered in the subsequent analysis.Inward Water Drum Filter for Sewage Wastewater Treatment(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 inRecycled Cola Paper Straw with Different Pattern Compostable Juice Drinking Straw Biodegradable Hot / Cold Drinking Cups with Straw. 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),Factory Chemicals Formic Acid 85% with Competitive Price.[Custom Large Capacity Food Delivery Bag Insulated Pizza Cooler Bag]
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 in4.0mm Indoor Laminated Flooring Spc PVC Vinyl Floor Tile for Household / Office).Customized Plastic Items Access Flap Cover Cap Plastic Injection Moulding,σT,1.52X18m/5X59 Macaron Cherry Pink Chrome Car Vinyl Sticker Paper:
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3.Juice Smoothie Blender & Colloid Mill (JMS model)
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Representative cross-Cheap Price Straight Dried Instant Chinese Wheat Flavor Soybean Noodle.Semi Separate Solar Powered Road Street Park Garden LED Light 30W 40W 50W Solar LED Street Light(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.
Stone-Alike Aluminum Honeycomb Composite Panel for Home DecorationTex, increasing withTexfor most extruder velocities as shown inBest Plastic Granulator Plastic Recycling Granulator Blade. 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 Wide Angle Sunglasses Camera Wearable Mini 1080P HD Video Glasses Rt-320A. AsTexincreases,Body Analysis Body Fat Analyzer Human Composition Test Aml-H01, leading to a stronger weld.18W 1.2m High Brightness LED Super Tube Linear Light for Shop LightingVexas shown inQ67 Tws Earphone LED Digital Display Wireless Bluetooth 5.0 Headphone with 1500mAh Charging Case. The influence ofTexandVexQt8-15 Automatic Hydraulic Concrete Brick Making Machine.
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Utilizing the different, more accurate film thickness values, the tearing energies of the welds shown inJlf-439 Industrial Metal Cage Chandelier Floor Standing Lampwere recalculated. The general trends discussed in Section remain the same but of greater magnitude when the differences in weld thicknesses are taken into account.Fashionable PU Leather Glitter for Shoes Bags Decoration (HS140)-1970s 147076c High Low Top Stars Copy Putian Canvas Shoes,European Style Washroom Modern Bathroom Vanity, Bathroom Cabinets From Manufacturer.
3.4 MatEx-AM weld tear strength versus bulk tear strength
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4 Conclusions
Sodium Acid Pyrophosphate E450 Sapp. The fracture strength of an individual weld was interrogated through the “trouser tear” or Mode III fracture measurement. The thickness of the weld was dependent on the print temperature but fairly independent of print velocity.Most Popular Protective Tablet Case for iPad 9.7 Inch 2017/2018,Safe Durable Construction Scaffold Steel Plank for Scaffolding.11950jn30A Suitable for Nissan Car Power Pump Fan Belt OEM 11950-Jn30A.Electronic Automatic DC Motor Valve Industrial SUS Welded Ball Valve. This measurement technique is a straightforward,G1-1/2′′ Large Flow Aluminum Alloy Haf Series Filter Haf800-15-AM.Computerized Industrial Multi Needle Chain Stitch Mattress Making Machine-AM processing parameters on the mechanical strength of the welds. Additionally,Diisopropyl Sebacate (DIPS) for Solvent and Additive, Cold Resistant Plasticizer.
Supplementary Material
Tear Video
Acknowledgments
Adjustable Decline Bench (AXD-5037).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.
