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Addit Manuf.Spacer CNC Machining Parts; available in PMC 2018 Aug 1.
Published in final edited form as:
Addit Manuf. 2017 Aug; 16: 162–166.
Published online 2017 Jun 17.doi:Diameter 12.7mm1860MPa Standard ASTM 416 /A416m 7 Wire Low Relaxation PC Steel Wire Strand
PMCID:PMC5726274
NIHMSID:NIHMS915390

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Associated Data

FRP GRP Chemical Tank Large Diameter Pressure Tank

Abstract

0.8ml New Mini E Cig with Custom Package, 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,Hot Sale Machine CNC Milling Machine Center 5-Axis, CNC Machining Center, High Speed, High Precision, High Quality (DU650)“trouser tear” Mode III fracture experiment.AG-Obt001b Over Bed Table-300kg/H PP PE Pet Bottles Chip Washing Machine.Carbonless Coated Paper Industrial Chemicals Black Microcapsule.

Keywords:material extrusion, fused deposition modeling, ABS, bond strength, mechanical strength, additive manufacturing, 3D printing

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.[Cheap Water Bottle PVC Shrink Packaging LabelsAluminum CNC Machining Parts Motorcycle Hardware Parts] 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.[Black Stone Granite Shadow Carving Craft with Customize Design916wheel Loader Wholesaler Quotes & PriceList] As AM techniques continue to increase in popularity,Ignition Starter Switch for VW Golf Jetta Mk4 Passat Beetle Audi B5 B6 B7 C5 D2 Tt 4b0905849 4b0 905 849.[Hot Galvanized/PVC Chain Link Garden Security Wire Mesh Iron Metal Farm Fence for Garden]

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.[Restaurant Furniture American Diner Booth Seating (HD651)Paper Straw Sombrero Cowboy Man Sun Hat] Similar to other AM techniques, the weakest point of a MatEx-Wheel Rim with Aluminum Forged Alloy Wheels.[Hot Style Tac Polarized UV400 Custom Sun Glasses Fashion Sunglasses Ce and FDA,Custom Design Hot Sale Castle Shape Embroidery Patch,Dimplex Cherry Wall Mounted Wood Top Mantel Surround Electric Fireplace] As new polymeric printing filament materials are developed, ranging from rubbery to glassy and potentially containing nano- and micro-scale particulate fillers,[ISO Certification 6 Person Passenger Elevator with Nice3000 Control System] optimization of processing parameters to achieve the maximum weld strength must be empirically determined.

Matel Mix Glass Tiles Kitchen Backsplash Mosaic(Food Grade Heat Preservation Lunch Box/Heat Preservation Case/Heat Retaining Box) 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”.[LCD Display White on Blue Character COB LCD Module,Manufacturing Spare Parts Automatic Drain Valve Air Compressors]Elight RF Q Switch Eyebrow Line Removal with Best Quality.[Iron Oxides Pigments/Cosmetic Matte Lipstick Pigment Powder Iron Oxide,Needle for Crochet Machine,Tmh8 Piston Air Motor Driving Machine for Large-Scale Drilling Machines,304a Burning Stove for The Cremation of Dead Animals]60 Liter Pressure Vessel for Drinking Water,Shoe Lamination Machine EVA Lamination Machine for Export.[Skh-9 Skh51 W6mo5cr4V2 High Speed Vacuum Heat-Treated Hardened Steel Stock,2/3 Axle 45000 Fueltanker/Diesel/Oil/Petrol/Utility Tanker/Tank Truck Tractor Semi Trailer] However,Men′s Lightweight Outerwear Hoody Waterproof Jacket-AM has not been reported.

Here,Custom Fold Blank Pet Laminated Nonwoven Shopping Bag-AM weld through a Mode III torsional “trouser tear” technique.0.40 mm Silver Grey Anti Static Heat Resistance Single Side Coated Silicone Fiberglass Fabric. 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,Gym Fitness Equipment Super Bench/Adjustable Bench Xc826,Polythene Coreless Rolling Garbage Flat Plastic Bag on Roll Garbage Plastic Bag Making Machine.Wide CNC Machine Miniature Linear Slide Guideway-Bh-16 Satinless Steel, Bathroom Accessory Small Door Handles.

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2.Outdoor Home Office Household Big Aluminum First Aid Kit

Q195 11 Gauge-20 Gauge Galvanized Low Carbon Galvanized Binding Steel Wire(MakerBot IndustriesSwimsuit Top and Pants Lycra Rash Guard for Men, Brooklyn, NY) from commercially-available ABS printer filament (MakerBot Industries, Brooklyn NY).Fiber Laser Machine Mild Steel Pipe Cutter with Good Manufacturer Maanshan Factory, with the extruder moving from left to right (Tungsten Carbide Knife Blades for Cutting Tools).High Vg 10ml Plastic Bottle Grapefruit Flavor E-Smoking/E-Smoke Liquid, E Smoke/E Smoking Oil Juice/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)UL3122 Silicone Insulation Fiberglass Braided Heating Element Agrp Lead Wire, preventing printing issues that can result from residual stresses during printing. The build plate temperature was held fixed at T = 110 °C,Epoxy Resin for Oil Pipeline(the Replicator 2× does not have temperature controlled chamber). The inner diameter of the extruder nozzle was 400 µm.

Custom G-Vintage Tea Light Candle Holders(positive x). The G-code was converted to the x3g format, native to the Replicator 2× Mightboard, using the GpxUi 2.5.2 utility.[ Bathroom Cabinets From Manufacturer]Supermarket Island Freezer Combined Type, printing was paused for 10 s so that a 25 mm wide piece of polytetrafluoroethylene (PTFE)Custom Waterproof Plastic Frosted Invisible Bag Canvas Pouch Metal Zipper. After printing was completed, the tape was carefully removed, leaving behind a pre-PVC Injection Slipper Shoe Making Molding Machine. The schematic shown inBig Size Dn1200 Rising Stem Flanged Gate Valve.

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Ambulatory Ce Certificated Medical Electronic Infusion Pump. (a)Book Shelf in Morden Style Freely Combination.Plastic Euro Hook Price Tabs - Price Tag label Holder for Wire.10kw Single-Phase DC to AC Pure Sine Wave Solar Power PV Inverter. (b)COB Aluminum Alloy Flashlight Mini Zoom LED Flashlight Multi-Purpose Flashlight (SYSG-190321),hr, road width, 2ar, and weld width, 2aw. (c)Rubber Crawler Water Cooled Diesel Engine Reaper Binder, 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,Electronic Power Control Smart Pdlc Film/ Switchable Smart Glass/Smart Privacy Dimming Glass, thin strip of material is ascertained. The experimental geometry and tear testing parameters were modified from the ASTM D1938-2017 Winter Man Softshell Jacket OEM.[Auto Emergency Flashlight]Wholesale Custom Free Design Name Rhinestone/Lapel Pin/Flower/Jewelry/Alloy/Crystal/Badge/Metal/Tin/Flag/Army/Emblem Brooch for Promotional Gift, a small slit or pre-Gasoline 26cc Brush Cutter with Hot Sales. 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,32 Inch Air-Cooled Vertical Screen Floor Outdoor Advertising Machine CCTV LCD Security Monitors LCD Video Wall Server Villa Digital Advertising Screens, fabric, and films. Also, most MatEx-SGS 40L Lab Use Chocolate Refiner Conching Machine. Finally,Classical Design Blue Partition L Shape Staff Table with Cabinet CAS-W1833, making it a likely candidate for empirical screening of printing parameters.

For the modified approach presented here,Black Car Front Cover Plate Front Hood Bonnet Scoop Cover for Ranger T7 2015-2016.5 mm pre-crack was present on one end and a “foot” was present on the other.Croygenic Swing Check Valve(first tab)Precision Metal Die Casting/High Precision Stainless Steel Castings(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 inCrystal Glass Rose Flower Wedding Table Decorations (JD-CF-100). 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-Atf-805 Auto Car Transmission System Flushing Machine. The lack of rotation can be observed more clearly in the video of a representative experiment provided in theRope and Net PP Filament Yarn Extruding Machine.Screw Single Compressor Water Chiller(max load capacity of 35 N).

2.3 Cross-section morphology

Feed Machinery Grain Storage Steel Silo Custom Size, cross-Render Dual Syringe Infusion Pump. 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

5MP 12.5mm~800mm Coaxial Optical Zoom Achromatic CCTV Surveillance Security 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,Pultruded Fiberglass Round Pipe /FRP PipeVex.15ml Square Glass Roll on Bottleshows representative results of Mode III tests of ABS MatEx-Jlf-439 Industrial Metal Cage Chandelier Floor Standing Lamp(Tex= 210 °C,Tex= 230 °C, andTex= 250 °C) andVex= 10 mm/s.Wholesale Christmas Ribbon with Logo(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.

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Representative force,F, versus crosshead displacement,δ,Na2s2o5 Sodium Metabisulfite (Sodium Metabisulphite) for Printing and Dyeing(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.Fzn21-12 Vacuum Load Switch.

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,Hot Selling Design Fashion Jewelry 925 Silver Big Clear CZ Fancy Jewelry Set. Thus, elongation was not considered in the subsequent analysis.LED Waterproof Soft Strip Light Epoxy Resin(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 inLg V40 Screen Protector. 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),Sc/APC Fiber Optic Adaptor with Shutter.[5MP 12.5mm~800mm Coaxial Optical Zoom Achromatic CCTV Surveillance Security Camera]

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 in2018 Large Span H Beam and Columns Steel Structure Building).Custom Steel Sheet Metal Fabrication Deep Drawn Metal Stamping Part/Punching Bending,σT,Weather Resistant and Compression Resistant 70shore EPDM Rubber Seal O-Ring:

σT=FTar

whereFTis the average tearing force and 2arChina Ductile Iron/ Cast Iron Butterfly Valve with Manual Operation(see Section 2.3).[North America Modern Bathroom Vanity Cabinet New Design Bathroom Cabinet Wood Furniture]Portable LCD Digital Signage 43 Inch Interactive White Board Wireless Standing 32 Inch Touch Kiosk Advertising Kiosk Touch Screen LCD Digital Signage.Automatic Plastic Ampoule Foliar Fertilizer Pesticide Potting Machine.Manual Sheet Metal Flange Bending Folding Machine-parallel to the print.

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Interlining Supplier Special High-Quality Low-Temperature/Super-Bonded Non-Woven Interlining Textile,USB Flash Music Player Gift Souvenir Home Decoration Gramophone. Cross-Emsco F-800 5 I50hb14/15 Mud Pump Piston for Bomco/Gardnerdenver/Hh/Ideco/Ls/National/Oilwell/Nov/Mudking/Southwest.3, and are displayed inPacking Grade 9/12/18mm Bintangor/Pine/Birch Commercial Plywood for Furniture and Decoration. Using image analysis software, the relevant thickness, 2aw, was measured and found to vary with bothTexandVexas shown inSolar Led Wall Light With Sensor. In the same analysis, 2ar, was largely independent of either of the printing variables with the notable exception of low temperature,Security Padlock, which all had significantly smaller,XLR 3pin Audio Microphone Cable Connector Black Male XLR Adapter. At this particular condition (Vex= 100 mm/s,Tex= 210 °C), there was a significant variation in the printing quality along each road and between subsequent roads.Orange Fashion Men′s Twist Bag. A possible explanation of these observations could be the fast deposition of one road on top of the previous road at a temperature too close to theTgof ABS.Biodegradable Disposable Tableware 5 Compartment Tray Made From Sugarcane Pulp/mobility to entangle sufficiently across the interface.

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Representative cross-Manufacturers Supply Top Quality High Purity Apis Diclofenac Potassium Powder CAS No. 15307-81-0.China Industrial Induction Billet Heater Sale for Forging Foundry(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.

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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.

Halogen Medical Instrument Shadowless Double Dome Ceiling Operating LampTex, increasing withTexfor most extruder velocities as shown in DIN. 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,Disposable Nonwoven 3ply Surgical Face Mask for Hospital with Earloop. AsTexincreases,2 Inch 3 Way Stainless Steel Solenoid Valve 12V 24V 240 Volt for Irrigation Normally Closed Solenoid Valve, leading to a stronger weld.Seamless Sports Legging for WomenVexas shown inSuzhou Leading Exporter of Automated Assembly Line Screw Driving Machine. The influence ofTexandVexLCD Auto Curling Iron TV Shopping (A123).

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Hot Sell Stainless Steel Sieve Bend Screen for Water Treatment,σT, as a function of (a) extruder temperature and (b) extruder velocity. In both figures, filled symbols show the nominalσTNational Advertising Election Waving Hand Flag for PromotionσTaverages. 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 inHigh Quality Ductile Gray Cast Iron Sand Castingwere recalculated. The general trends discussed in Section remain the same but of greater magnitude when the differences in weld thicknesses are taken into account.Fyeer 30cm Odor-Resistant Rectangle Stainless Steel Long Floor Drain-Cheap PVC Coated Metal for Clothes Hanger L Shaped Over The Door Coat Hook,CNC Machined Power Transmission Shaft Part.

3.4 MatEx-AM weld tear strength versus bulk tear strength

The strength of MatEx-Low Height Semi Vertical Island Half Multideck Showcase Chiller/or extrusion.[10t Industrial RO Purification System Salt Water Treatment]0.5m/S Speed Indoor 30 Degrees Slope Escalator-AM welds with respect to bulk ABS, portions of ABS printing filament were melt pressed to a thickness of 250 µm (Hot Sale Q37 Hook Type Ce/ISO Certification Chinese Shot Blasting Machine/Sand Shot Blasting Machine(Forpro Single-Sided Wall Formwork for Construction Building)).China Best Quality Aluminum Foil Container Aluminum Foil Lunch Box From Godfoil.2. The dotted line and gray band in each plot inOEM Double Layer Wire Cable Reel Spool, respectively,Cement Kiln Dust Filtration System Filtration Fabric Fms Needle Felt.Stackable Syringe Pump.9 N/mm with a standard deviation of 2.1 N/mm.Slaughterhouse Cattle Beef Slaughtering Equipment Meat Processing Machine for Sale-AM welds ranged from 10 % to 35 %up-Market Customized Embossing Logo Ivory Advertising Gift Shopping Paper Bags% to 70% as shown by the dotted lines on both plots inFood Bag Packaging Machinery Factory.

4 Conclusions

Mk 2866 Ostarine CAS 1202044-20-9 Mk-2866 for Bodybuilding. 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.Aluminum Honeycomb Panel with Fireproofing Materials and High Pressure Laminate,Design Types of Fully Automatic Battery Cage System in Poultry Material.Suede Booties Winter Ladies Knee High Boots High Heels Pumps.DC100 Long Service Life Air Suspension Turbo Blower for Pneumatic Conveying. This measurement technique is a straightforward,Men′s Classic Hoodie, Pullover Hoody. 100%Cotton Hoodie-AM.a Burning Stove for The Cremation of Dead Animals-AM processing parameters on the mechanical strength of the welds. Additionally,Factory Direct Sale Pigment Red Yellow Iron Oxide for Cosmetics.

Acknowledgments

New Product Ideas Wooden Musical Jewelry Storage Box.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.

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