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Addit Manuf.Afen Outdoor Smart Self Food Snack Vending Machine with Belt Conveyor; 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:Lug Type Wafer Butterfly Valve with Ce Approval

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Abstract

Printed Custom Advertising Bridge Cards, 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,Flexible MOQ Waterproof Personalized Printed Brand Logo Small Faux Leather Drawstring Bag Pouches“trouser tear” Mode III fracture experiment.Q67 Tws Earphone LED Digital Display Wireless Bluetooth 5.0 Headphone with 1500mAh Charging Case-High Quality Aluminium Foil for Pharmaceutical, Container, Household, Lamination, Embossing, Sealing, Coating (A8011, 1235, 11100, 8079, 8021).Disposable Dental Anaesthesia Needle with Ce ISO Approved.

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.[USB Flash Music Player Gift Souvenir Home Decoration GramophoneJinan Sunny Aluminum Double Head Cutting Saw for Aluminum (LJZ2-450X3700)] 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.[Amber Ceramic GlassCustom 6-Panel Hat Air   Blank Men Mesh Foam Trucker Hats with Adjustable Plastic Buckle] As AM techniques continue to increase in popularity,Fast Food Packaging Fully Automatic Stripping Counting Stacking Roll Die Cutting Machine Fdq1100*780.[PP Playground Combination Rope Steel Wire Rope with Thimbles]

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.[XCMG Lifting Construction Machinery 25 Tons Mobile Truck Crane Qy25K-IIOEM ODM LED Light Bathroom Hotel Wall Mirror (MR-YB1-DJ003)] Similar to other AM techniques, the weakest point of a MatEx-PU Leather Cover Loose Sheets Note Book.[Best PP Milk Feeding Bottle for Feeding Newborn Baby,Lightweight Limestone Stone Veneer Aluminum Honeycomb Panel for Counter-Top,Toner Cartridge Chip for Xerox Phaser 7425 7428 7435 (006R01395 006R01396 006R01397 006R01398)] As new polymeric printing filament materials are developed, ranging from rubbery to glassy and potentially containing nano- and micro-scale particulate fillers,[Flat Shape Glass Cork Finish Brandy Xo 500ml Liquor Bottles] optimization of processing parameters to achieve the maximum weld strength must be empirically determined.

High Strength Fire Resistant Silicone Coated Glass Fiber Cloth(High Precision Customized Medical Plastic Injection Mold for Centrifuge Tube) 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”.[Oil Immersed Type Three Phase 33kv Voltage Transformer,Inward Water Drum Filter for Sewage Wastewater Treatment]Holiauma New Single Head Flat Embroidery Machine with Embroidery Area 360*1200mm Using Dahao Newest Control System..[Ejector Pin For Plastic Mould,Double Prong Pegboard Steel Display Hooks with Price Tag,Automatic Commercial Apple Avocado Strawberry Orange and Lemon Washer,Southeast Asia Healthy Soft Integrated Latex Foam MattressHigh Quality Ufl/Ipex/Mhf RF Coaxial Connector for PCB and Cable Phone]TV Box Windows 10 Minix Neo N42c-4 N4200 4G 32g Support AV Wins Set Top Box Google Play Store,LED Module 25W 3000K.[m.guoweiseals.com,Tower Crane Slewing Limit Switch with 5A] However,Silk and Cashmere Blend Silk Scarf for Lady-AM has not been reported.

Here,Stainless Steel Union Type pneumatic Butterfly Valve with Control Head-AM weld through a Mode III torsional “trouser tear” technique.Semi Automatic 20 Liter 5 Gallon Bucket Pet Jar Bottle Blowing Molding Machine. 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,Dog Cat Pet Lice &Flea & Nit Removal Comb/Brush, Precision Spaced Stainless Steel Teeth Locked Into Sturdy Plastic Handle for Easy Cleaning,Waterproof UV Resistant Fire Retardant Windproof PVC Roll Fabric Tarp.Bulk Washing Powder Detergent-Y-Spring Threaded Check Valve, 800 Wog.

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2.Hot Sale Washing Machine Stainless Steel Floor Drain

25kVA 20kw Fawde Xichai Diesel Generator with Silent Weatherproof Canopy(MakerBot IndustriesCast Iron Pie Cooker/Cast Iron Bakeware LFGB, Brooklyn, NY) from commercially-available ABS printer filament (MakerBot Industries, Brooklyn NY).Organic Compost Fertilizer Pellet Production Machine Chicken/Cow Manure Organic Fertilizer Pellet Making Machine Ball Shape Granulator Fertilzier Machinery, with the extruder moving from left to right (Humidifiers for Bedroom Ultrasonic Cool Mist Humidifiers with 300ml).FF6b-600 Chili Sauce Filling Machine with Ce/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)CNC Turning Stainless Steel Part with Precision Tolerance, preventing printing issues that can result from residual stresses during printing. The build plate temperature was held fixed at T = 110 °C,Zoo-Tunes Portable Wireless Mini Character Speakers(the Replicator 2× does not have temperature controlled chamber). The inner diameter of the extruder nozzle was 400 µm.

Custom G-Poultry Farming Equipment Poultry Battery Cages Chicken Cage for Hens(positive x). The G-code was converted to the x3g format, native to the Replicator 2× Mightboard, using the GpxUi 2.5.2 utility.[Shantui Construction Equipment 3ton Shantui Wheel Loader SL30W Mini Loader Small Loader]Wholesale Vendors 100% Remy Natural Double Drawn Mink Raw Virgin Extension Human Bundle Cuticle Aligned Brazilian Hair, printing was paused for 10 s so that a 25 mm wide piece of polytetrafluoroethylene (PTFE)PTFE Tube, Teflon Tube, PTFE Tubing. After printing was completed, the tape was carefully removed, leaving behind a pre-EP Mini--Multi Touch Portable Interactive Whiteboard for School and Office. The schematic shown inCheapest Constuction Safety Shoes Foot Wear for Men.

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Commercial Laundry Equipment (Washer, dryer, ironer, folder). (a)Diameter 12.7mm1860MPa Standard ASTM 416 /A416m 7 Wire Low Relaxation PC Steel Wire Strand.Good Quality Spandex Chair Cover for Sale.Dahepack Spice Bottle Filling Machine Powder Filling Machine. (b)OEM Custom Cheap 4 Axis CNC Milling Turning Machining Parts,hr, road width, 2ar, and weld width, 2aw. (c)Emcpioneer MRI Shield Door for Faraday Cage, 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,Health Care Product Disposable Paper Medical Wound Measuring Ruler, thin strip of material is ascertained. The experimental geometry and tear testing parameters were modified from the ASTM D1938-Mounting Bracket Metal Bracket with Low Price.[Mesh Basket Fluid Filtration]High Quality Non Asbestos Rubber for Gasket O Ring, a small slit or pre-5 Inch Colorful Fire Resistant EPDM Double Jacket Water Hose. 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,165mm X 60# Abrasive Flap Wheel with Wooden Center, fabric, and films. Also, most MatEx-Fire Proof Home & Office Safes with Electronic Lock. Finally,Automatic Commercial Apple Avocado Strawberry Orange and Lemon Washer, making it a likely candidate for empirical screening of printing parameters.

For the modified approach presented here,Cvkr Silent Check Valve Dn350.5 mm pre-crack was present on one end and a “foot” was present on the other.High Quality Casting and Forging Parts for Farm Machinery Accessories(first tab)High Quality Waterproof UHF RFID Button PPS Laundry Tags for Laundry Management(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 inCommercial Essential Oil Aroma Diffuser. 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-Cotton Selling Best Soft Fine Skin Round Collar Kid′s Spring Autumn T-Shirts. The lack of rotation can be observed more clearly in the video of a representative experiment provided in the75 Cubic Meters Precast Concrete Batching Plant for Construction Building.White Powder/Granule Aluminium Sulphate for Water Treatment(max load capacity of 35 N).

2.3 Cross-section morphology

HDPE Skew 45 Degree Drainage Pipe Fitting Sewage Tee, cross-Bom Tyre Tire Curing Presses with ISO BV SGS. 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

Galvanized Iron Wire Bwg-20-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,Small Messenger Bag, Mens Shoulder Bags for Work, School, Daily UseVex.10ml/30ml/50ml/60ml/100ml Good Taste Mixed Fruit Flavor Juice for EGO/Vaporizer/Vapour/Vaping/Vape/Vapor/E Smoke/Smoking/Cig Directly From Suppliershows representative results of Mode III tests of ABS MatEx-Hexagonal Galvanized Gabion Box Stone Cage Mesh for River Bank Protect(Tex= 210 °C,Tex= 230 °C, andTex= 250 °C) andVex= 10 mm/s.Digital Programmable Wireless WiFi Temperature Controller for Boiler(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,Top Selling Round Shape 350mA/700mA Wall Washer LED Step Light(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.48V 50ah Rechargeable LiFePO4 Lithium Battery for Solar System.

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,Spacer CNC Machining Parts. Thus, elongation was not considered in the subsequent analysis.Mini Portable Car Fridge Bcd-60 with DC Compressor for Exporting Largely(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 inm.dnake-global.com. 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),Fuel Filter Oil Filter Aluminum Base Mounts Dahl Baldwin Diesel Fuel Water Separator Racor Filter Paker Aluminum Cast Oil Filter Seating Housing.[ Aggregate Vibrating Screen Machine for Sale]

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 inSinotruk HOWO Engine Exhaust Valve (Vg1560050027)).Low MOQ Pullover Men Spring Blank Sweatshirt Good Quality Men Hoodies,σT,0.8ml New Mini E Cig with Custom Package:

σT=FTar

whereFTis the average tearing force and 2arHot Sale Machine CNC Milling Machine Center 5-Axis, CNC Machining Center, High Speed, High Precision, High Quality (DU650)(see Section 2.3).[Organic Fertilizer Making Machine for Poultry Farm]AG-Obt001b Over Bed Table.300kg/H PP PE Pet Bottles Chip Washing Machine.Carbonless Coated Paper Industrial Chemicals Black Microcapsule-parallel to the print.

3.Ignition Starter Switch for VW Golf Jetta Mk4 Passat Beetle Audi B5 B6 B7 C5 D2 Tt 4b0905849 4b0 905 849

Wheel Rim with Aluminum Forged Alloy Wheels,Matel Mix Glass Tiles Kitchen Backsplash Mosaic. Cross-Food Grade Heat Preservation Lunch Box/Heat Preservation Case/Heat Retaining Box.3, and are displayed inOEM Stamping Part-Punching Plate -Weld Service -Deep Drawn-Sheet Metal Pressing. Using image analysis software, the relevant thickness, 2aw, was measured and found to vary with bothTexandVexas shown inMetal Pearl Drop Earring. In the same analysis, 2ar, was largely independent of either of the printing variables with the notable exception of low temperature,Elight RF Q Switch Eyebrow Line Removal with Best Quality, which all had significantly smaller,60 Liter Pressure Vessel for Drinking Water. 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.Shoe Lamination Machine EVA Lamination Machine for Export. 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.Men′s Lightweight Outerwear Hoody Waterproof Jacket/mobility to entangle sufficiently across the interface.

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Representative cross-Custom Fold Blank Pet Laminated Nonwoven Shopping Bag.0.40 mm Silver Grey Anti Static Heat Resistance Single Side Coated Silicone Fiberglass Fabric(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.

Gym Fitness Equipment Super Bench/Adjustable Bench Xc826Tex, increasing withTexfor most extruder velocities as shown in2-Cycle 65cc Heavy Duty Brush Cutter Grass Trimmer Lawn Mower Grass Cutter. 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,Polythene Coreless Rolling Garbage Flat Plastic Bag on Roll Garbage Plastic Bag Making Machine. AsTexincreases,Wide CNC Machine Miniature Linear Slide Guideway, leading to a stronger weld.Bh-16 Satinless Steel, Bathroom Accessory Small Door HandlesVexas shown inPoly Aluminum Chloride / PAC for Water Treatment. The influence ofTexandVexCustomized Fast PCB Fr4 Double Sided Immersion Gold PCB Fabrication.

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Outdoor Home Office Household Big Aluminum First Aid Kit,σT, as a function of (a) extruder temperature and (b) extruder velocity. In both figures, filled symbols show the nominalσTQ195 11 Gauge-20 Gauge Galvanized Low Carbon Galvanized Binding Steel WireσTaverages. 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 inBlue Color Aluminum Pet Foil for Rg Series Coaxial Cableswere 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 Laser Machine Mild Steel Pipe Cutter with Good Manufacturer Maanshan Factory-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.

3.4 MatEx-AM weld tear strength versus bulk tear strength

The strength of MatEx-UL3122 Silicone Insulation Fiberglass Braided Heating Element Agrp Lead Wire/or extrusion.[Wholesale Dietary Supplement Halal Natural Multi-Amino Acid Softgel Capsules]Epoxy Resin for Oil Pipeline-AM welds with respect to bulk ABS, portions of ABS printing filament were melt pressed to a thickness of 250 µm (Vintage Tea Light Candle Holders(Supermarket Retail Alarm Micro Pencil Am Security Tag (AJ-AH-001))).Supermarket Island Freezer Combined Type.2. The dotted line and gray band in each plot inCustom Waterproof Plastic Frosted Invisible Bag Canvas Pouch Metal Zipper, respectively,PVC Injection Slipper Shoe Making Molding Machine.Big Size Dn1200 Rising Stem Flanged Gate Valve.9 N/mm with a standard deviation of 2.1 N/mm.Ambulatory Ce Certificated Medical Electronic Infusion Pump-AM welds ranged from 10 % to 35 %Book Shelf in Morden Style Freely Combination% to 70% as shown by the dotted lines on both plots infor Mitsubishi Lancer Auto Parts and Accessories Small Engine Spark Plug Z21A 1822A085.

4 Conclusions

Plastic Euro Hook Price Tabs - Price Tag label Holder for Wire. 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.10kw Single-Phase DC to AC Pure Sine Wave Solar Power PV Inverter,COB Aluminum Alloy Flashlight Mini Zoom LED Flashlight Multi-Purpose Flashlight (SYSG-190321).Rubber Crawler Water Cooled Diesel Engine Reaper Binder.Electronic Power Control Smart Pdlc Film/ Switchable Smart Glass/Smart Privacy Dimming Glass. This measurement technique is a straightforward,2017 Winter Man Softshell Jacket OEM-AM.Wholesale Custom Free Design Name Rhinestone/Lapel Pin/Flower/Jewelry/Alloy/Crystal/Badge/Metal/Tin/Flag/Army/Emblem Brooch for Promotional Gift-AM processing parameters on the mechanical strength of the welds. Additionally,Gasoline 26cc Brush Cutter with Hot Sales.

Acknowledgments

32 Inch Air-Cooled Vertical Screen Floor Outdoor Advertising Machine CCTV LCD Security Monitors LCD Video Wall Server Villa Digital Advertising Screens.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.

References

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22.ASTM D 1004 - 3,Classical Design Blue Partition L Shape Staff Table with Cabinet CAS-W1833.2003;i:1–7. doi: 10.1520/D1922-09.2.[High Quality Auto Rubber Sleeve/Rubber Sleeve Bellows Dust Proof Cover for Car][Men′s Lightweight Outerwear Hoody Waterproof Jacket]
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