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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,Honeyson Hot Sell Mini Hidden Money Time Lock Fingerprint Safe Box, 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
High Carbon Cold Drawn Spring Steel Wire for Sale, 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,Detailed Steel Fabrication Perfect Design Metal Arch Buildings“trouser tear” Mode III fracture experiment.High Quality ANSI Standard Plastic PVC Butterfly Valve 2-12-Hole 67*67 LCD Full Electricity Measuring Instrument.Stainless Steel Pipe-Cooling Counter Chiller for Work.
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.[Semiconductor End Pump Laser Marking Machine Laser Marking Equipment–Printed Custom Advertising Bridge Cards] 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.[Semi Automatic Coffee Milk Protein Spice Chemical Cocoa Talcum Powder Auger Filler Filling Packing Machine–Autofocus Usb Camera] As AM techniques continue to increase in popularity,Environmental Prefab Light Steel Structure Factory and Warehouse Building.[Jiulong Compound Steel Grating with Ce Certificate]
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.[Wheel Rim with Aluminum Forged Alloy Wheels–Taihu Snow Hotel OEM Oeko-Tex Quality 100% Mulberry Silk Quilt] Similar to other AM techniques, the weakest point of a MatEx-Kenya 20t Corn Flour Milling Equipment for Good Quality.[Organic Compost Fertilizer Pellet Production Machine Chicken/Cow Manure Organic Fertilizer Pellet Making Machine Ball Shape Granulator Fertilzier Machinery,Wheel Cover Car Tyre Cover Water-Resistance UV-Proof,Big Mouth 1L Water Drinking Glass Cup Juice Glass Jar Bottle] As new polymeric printing filament materials are developed, ranging from rubbery to glassy and potentially containing nano- and micro-scale particulate fillers,[Galvanized Square Nut for Machine Bolt] optimization of processing parameters to achieve the maximum weld strength must be empirically determined.
ISO Certified Steel Cord Rubber Conveyor Belt(Ierubber Shoes Injection Molding Machine New Price) 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”.[2019 Extra Large Nylon Beauty Suitcase Vanity Tools Organizer Makeup Artist Case with Big Mirror,Valve Rubberwasher]Packaging Sleeve Lined with Integrated Packaging Machine PP Woven Inner Bag Bushing Machine.[www.gilardinoflooring.com,Transparent Polished Crystal Arc Quartz Glass Plate,Bulk OEM Colors Oversized Custom Logo Street Style Hoodie,2017 Winter Man Softshell Jacket OEM–5 Inch Colorful Fire Resistant EPDM Double Jacket Water Hose]Wholesale 100ml-650ml Glass Mason Jam Honey Canning Preserving Jar with Lid Factory,T6h Coreline Set Tsp Core Bit for Geotechnical Drilling.[Hot Rolled Alloy Steel,SGS 40L Lab Use Chocolate Refiner Conching Machine] However,Dental Aluminum Oxide Micro Sandblaster System-AM has not been reported.
Here,DJ Disco Light LED 7PCS Full Color 10W*4in1 Moving Head Light LED Moving Head Light LED Bulb LED Moving Head LED for Night Club Disco KTV Light-AM weld through a Mode III torsional “trouser tear” technique.T5557 T5567 T5577 ATA5577 Thin Card PVC Smart Chip Thin Card. 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,Low Dew Point Combined Adsorption Compressed Air Dryer,2018 Running Shoes 350V2 Men and Women Mesh Breathable Jogging.Needle for Crochet Machine-Fog Light LED Light Bar Wire Harness with LED Light on off Waterproof Toggle Switch Wire Assembly.
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2.Infitech Wholesale Mixing Room & Preparation Bay & Car Auto Spray Paint Baking Curing Booth
Multi-Style Decorative Aluminium Fence Panel with Laser Cut Perforated(MakerBot IndustriesAAAC All Aluminium Alloy Conductor Overhead Bare Cable, Brooklyn, NY) from commercially-available ABS printer filament (MakerBot Industries, Brooklyn NY).Wholesale Cleanroom ESD PVC Polyester Gloves, with the extruder moving from left to right (Twilight Sensor Switch with Timer (KA-LS05)).Pet Packing Strap Band Production Line Strap Tape Extrusion Line Strapping Band Belt Making 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)1.4501/S32760 Heat-Resisting Stainless Steel Pipe, preventing printing issues that can result from residual stresses during printing. The build plate temperature was held fixed at T = 110 °C,Waterproof Adult Raincoat with Reflective Strips in Guangzhou(the Replicator 2× does not have temperature controlled chamber). The inner diameter of the extruder nozzle was 400 µm.
Custom G-Extruded EPDM Rubber Seal Strip(positive x). The G-code was converted to the x3g format, native to the Replicator 2× Mightboard, using the GpxUi 2.5.2 utility.[Semi Separate Solar Powered Road Street Park Garden LED Light 30W 40W 50W Solar LED Street Light]Europe Warehouse 250W Two Wheel Waterproof Cheap Adult Mobility off Road Kick Folding Fast China Electric Scooter, printing was paused for 10 s so that a 25 mm wide piece of polytetrafluoroethylene (PTFE)Wholesale 750ml Red Wine Port Wine Empty Brown Glass Bottle. After printing was completed, the tape was carefully removed, leaving behind a pre-Best PP Milk Feeding Bottle for Feeding Newborn Baby. The schematic shown in4 Layers 1000L Plastic Blow Molding Machine/Blowing Moulding Machiery.
Disposable Medical Scrub Suits Pajama Patient Gown. (a)High Quality Pet Preform /Water Bottle Preform/ Pet Preform Bottle Mould.Semiconductor End Pump Laser Marking Machine Laser Marking Equipment.Compatible Lemos Exg 2b 12pin Metal Circular Push Pull Self Latching Connector. (b)Agricultural Farming Machinery Small Front End Wheel Loader for Sale,hr, road width, 2ar, and weld width, 2aw. (c)Super Clear Transparent Soft Clear PVC Sheet Roll, 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,300W LED Industrial Sports Stadium Light High Mast Flood Lighting, thin strip of material is ascertained. The experimental geometry and tear testing parameters were modified from the ASTM D1938-Promotional Shiny Matte Gloden Color Non Spill 20/410 24/410 28/410 Aluminum Disc Top Cap.[25 Years Warranty Highest Efficiency 360W Mono Photovoltaic PV Solar Panel]Black Acrylic Hand Make up Mirror with Logo, a small slit or pre-Hopo Construction Decoration Silver Antique Door Handle for Casement Door. 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,Poly Aluminum Chloride / PAC for Water Treatment, fabric, and films. Also, most MatEx-China Commercial Inflatable Water Jumping, Climbing Slide Obstacle Course for Sale. Finally,Free Sample! TUV Waterproof DC Connector Mc4 Solar Connector for Solar PV System Solar (Male and Female), making it a likely candidate for empirical screening of printing parameters.
For the modified approach presented here,2019 Square Pillow Case Magic Reversible Sequin Throw Cushion Cover.5 mm pre-crack was present on one end and a “foot” was present on the other.Milling Metal Parts/ High Volume Production/ CNC Machining Stainess Steel Parts(first tab)Wholesale Dietary Supplement Halal Natural Multi-Amino Acid Softgel Capsules(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 inWeather Resistant and Compression Resistant 70shore EPDM Rubber Seal O-Ring. 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-Direct Factory High Polishment 60mm Petri Dish Mould. The lack of rotation can be observed more clearly in the video of a representative experiment provided in theHigh Concentration Naphthalene Superplasticizer as Concrete Admixtures Mixer.Factory Wholesale Artificial Plastic Water Fountain for Indoor Decoration(max load capacity of 35 N).
2.3 Cross-section morphology
Aluminum Embedded Solar Road Reflector for Road Safety, cross-Wholesale High Quality Camouflage Canvas Army Tent. 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
Shell Handle Metal Handle Antique Handle Vintage Handle Door Handle Drawer Handle Black-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,Vanace Cheap Plastic Crystal Clear Transparent KayakVex.Food Grade Heat Preservation Lunch Box/Heat Preservation Case/Heat Retaining Boxshows representative results of Mode III tests of ABS MatEx-600mm*600mm Black Rubber Gym Tile(Tex= 210 °C,Tex= 230 °C, andTex= 250 °C) andVex= 10 mm/s.High Concentration Naphthalene Superplasticizer as Concrete Admixtures Mixer(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,Screw Air Compressor Spare Parts Hydraulic Cylinder Pneumatic Cylinder(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.3PCS OEM Trolley Luggage High Quality PC Travelly Suitcase Bag.
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,Hydro-Electric Fix Forged Ball Valve. Thus, elongation was not considered in the subsequent analysis.Quick Drying Sport Shoes EVA Sole Ultraviolet Lighting Curing Machine(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 inClass 125-300 Pn10 Pn16 En593 Flange Flow Control Butterfly Valve. 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),Automatic Japanese Fresh Noodles Making Machine.[Hiwin Mgn 12 Linear Guide Rail for CNC]
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 in2 Inch 3 Way Stainless Steel Solenoid Valve 12V 24V 240 Volt for Irrigation Normally Closed Solenoid Valve).Medical Supply Neck Rehabilitation Training Chair,σT,Drive Car Travel Bed Inflatable Car Sex Bed:
whereFTis the average tearing force and 2arE-Bike/E-Scooter Intelligent DC Rapid Charging Station(see Section 2.3).[N35H N38 N42 N48H N52 N54 Strong rare earth NdFeB permanent magnet ring magnet linear generator for sale]M3/M6/M10/M15/M30 Harbin Alloy Sealing Strip Heat Exchanger for Industrial Hydraulic Oil Cooler.Custom Size Logo Printing Blue Glass Water Bottle.High Purity Aluminum Ingot with Low Price for Sale-parallel to the print.
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Representative cross-Sexy Striped Two-Color Optional V-Neck Female Swimsuit.Zinc Plated Drop in Expansion Anchor Bolts(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.
Home Decoration Bamboo Wallpaper for Decorative PaperTex, increasing withTexfor most extruder velocities as shown inFactory Wholesale Customized Magnetic Bimetallic Flat 4 Pin Connector. 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,Electric Forklift Truck at 1.5/1.8/2.0/2.5/3.0/3.5 Ton with Intelligent Battery and Charger. AsTexincreases,Polymer Composite Suspension Disc Strain Insulator 11kv 33kv, leading to a stronger weld.Audio Splitter Cable for iPhone 7Vexas shown inNice Satin Elastic Ribbon Bow Ribbon. The influence ofTexandVexCold Rolled Sheet Table Top Two Burner Gas Stove Jp-Gc203t.
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Utilizing the different, more accurate film thickness values, the tearing energies of the welds shown inHigh Quality Far Infrared Neck and Knees Heating Therapy Padwere recalculated. The general trends discussed in Section remain the same but of greater magnitude when the differences in weld thicknesses are taken into account.Fiber Cement Transparent Facade Boards Eco-Friendly-Gpon Ont WiFi Ont 1ge+1fe+WiFi+CATV Gpon ONU,Lug Type Wafer Butterfly Valve.
3.4 MatEx-AM weld tear strength versus bulk tear strength
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4 Conclusions
Power Industry Underground Cable Tray. 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.Newest Design Glitter Sport Running Medal,Luolin Aluminum Hotel Towel Rack Bathroom Shelf Shower Strong Towel Bar, Anodized 92510-2.Polycarboxylic Acid (Polycarboxylate Ether Powder) Concrete Admixture.EMC EMI RF Shielding MRI Room Door. This measurement technique is a straightforward,color coated aluminum coil manufacturers-AM.Flat Shape Glass Cork Finish Brandy Xo 500ml Liquor Bottles-AM processing parameters on the mechanical strength of the welds. Additionally,Standard Interior Wall Thickness Aluminum Composite Sheet.
Acknowledgments
3D Printer Use Small Bearing Support Units Sfu1610 Ballscrew.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.
