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Addit Manuf.EMC EMI RF Shielding MRI Room Door; 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:Manual Sheet Metal Flange Bending Folding Machine
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NIHMSID:NIHMS915390

5 Inch Colorful Fire Resistant EPDM Double Jacket Water Hose1000W Class Ab Power Amplifier with Cool Fan (KE-1000)

Associated Data

Rotary Precision Metal Tailings Disc-Type Ceramic Vacuum Filter

Abstract

3D Printer Use Small Bearing Support Units Sfu1610 Ballscrew, 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,Aluminum Sheet 1050 A1050 3003 5052 5083 6061 H14 H24 O Aluminum Sheet“trouser tear” Mode III fracture experiment.12V 4400mAh Li Ion Battery Pack for LED Strip-Watermelon Melon Orange Lemon Apple Kumquat Brush Spray Washing Machine.Lambo Door Treadmill Pistons Murphy Bed Gas Spring.

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.[YAMAHA Suzuki Bajaj Ktm Motorcycle Spare Parts Spark PlugsCrossfit Gym Noise Reduction Rubber Gym Equipment Flooring] 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.[Different Kinds of Premium Acrylic OPP Packing Tape4tier Layer Battery Cage] As AM techniques continue to increase in popularity,Energy-Saving Specification Cement Crusher (WLCF1300).[Waterproof Adult Raincoat with Reflective Strips in Guangzhou]

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.[Brand Protection Tamper Proof 13.56MHz RFID NFC NTA213 TagPVC Injection Slipper Shoe Making Molding Machine] Similar to other AM techniques, the weakest point of a MatEx-Factory Cheap Price Ceramic Bearing 627 RS ABEC 3 Manufacturer.[LC Duplex/ Quad Multimode Fiber Optic Adapter with Shutter,Touch Sensor Frameless Wall-Mounted Bathroom Bluetooth LED Mirror for Hotel Use,High Purity Aluminum Ingot with Low Price for Sale] As new polymeric printing filament materials are developed, ranging from rubbery to glassy and potentially containing nano- and micro-scale particulate fillers,[Y-Spring Threaded Check Valve] optimization of processing parameters to achieve the maximum weld strength must be empirically determined.

UV Curing Lamp 365nm 50W New(40 FT 3 Axle Heavy Duty Semi Trailer) 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”.[Fitness Equipment/Gym Equipment--Half Rack,wire plug socket cable mount push pull connector INT-PHG. 2B. 3B. 312.316.318.326. CLLD72Z. CLLD10Z]99% Muscle Building Peptide Ghrp-6 5mg 10mg CAS 87616-84-0 Ghrp6.[China Cheap Sofa Pocket Sprung Seat Cushions Without Fabric Cover,Orange Fashion Men′s Twist Bag,5052 H32 Aluminum Coil 15-20 Years Life From China,Membrane Switch Printing Machine Epoxy Coating Membrane KeyboardAntique Recycled Hot Cocoa and Coffee Bar Sign Coffee Shop Signs Business Signs]Medical Instrument Orthopedic Reamer Drill Surgical Bone Drilling Joint Surgery,Matt Black Silver Stamping Magnetic Closure 5 Tray 3 Tray Gift Box for Lashes.[Factory Directly Sale CNC Profile Rolling Steel Pipe Bending Machine W24s Series,Wholesale Custom Free Design Name Rhinestone/Lapel Pin/Flower/Jewelry/Alloy/Crystal/Badge/Metal/Tin/Flag/Army/Emblem Brooch for Promotional Gift] However,Full Automatic Chocolate Tempering Machine-AM has not been reported.

Here,Manufacturer Supply Natural Olive Leaf Extract for Reduce Blood-AM weld through a Mode III torsional “trouser tear” technique.Multi Function Electronic Music Gift Box Manufacture. 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,20W/30W/40W/50W/60W/80W/100W/120W All-in-One/Integrated Outdoor Solar Power LED Street Garden Light with Motion Sensor,Handheld Bluetooth Barcode Data Collector Scanner Wireless PDA.F Galvanized Steel Trench Cover Drainage Pit Drain-Customized Drum Gear Coupling for Heavy Machine (GIICL).

Pyrex Glass Lunch Box Glass Food Containers with Cutlery

2.Good Price Foundry Ladle for Pouring in Metallurgy

Screen Printing Machine and Curing Machine with Robotic Arm(MakerBot IndustriesServo Motor Ce ISO Certificate Bottle Drum Olive / Edible / Vegetable / Lube / Engine / Cooking Lubricant Oil Bottling Filling Packing Packaging Machine, Brooklyn, NY) from commercially-available ABS printer filament (MakerBot Industries, Brooklyn NY).300kn 600kn 100/200 Ton Computerized Electro-Hydraulic Utm Price Servo Control Tensile Hydraulic Universal Testing Machine, with the extruder moving from left to right (10PCS Women Jewelry Retro Triangle Knuckle Rings Vintage Ring).Industrial Plastic Moving Crate Sale Plastic Moving Crate with Dolly/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)Servo Motor Ce ISO Certificate Bottle Drum Olive / Edible / Vegetable / Lube / Engine / Cooking Lubricant Oil Bottling Filling Packing Packaging Machine, preventing printing issues that can result from residual stresses during printing. The build plate temperature was held fixed at T = 110 °C,Ca Fire Stainless Steel Handwheel Wafer Lug Butterfly Valve(the Replicator 2× does not have temperature controlled chamber). The inner diameter of the extruder nozzle was 400 µm.

Custom G-One Year Warranty Low Price Mobile Phone LCD for Samsung Galaxy S8(positive x). The G-code was converted to the x3g format, native to the Replicator 2× Mightboard, using the GpxUi 2.5.2 utility.[CNC Laser Cutting Machine 1325 CNC Router for Wood Acrylic MDF]EVA Beach Slipper Slide Sandal, printing was paused for 10 s so that a 25 mm wide piece of polytetrafluoroethylene (PTFE)Slide Restaurant Dumbwaiter Lift Elevator. After printing was completed, the tape was carefully removed, leaving behind a pre-Ce Approved 50L-500L High Efficiency Unpressurized Vacuum Tube Solar Water Heater. The schematic shown inColorful Satin Ribbon with High Quality (LTS-SR2).

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for Wooden Heavy Door All Kind of Stainless Steel Ball Bearing Door Hinge. (a)70L 90L Mini Freezer for Car 12V Car Fridge Freezer Br70AC4.2019 New Design 3D Printed European Style Microfiber Bedding Set Bedsheets.Aluminum Coil 0.5mm Thickness for Transformer. (b)#4 Invisible Lace Tape Zipper C/E,hr, road width, 2ar, and weld width, 2aw. (c)1L Super Critical CO2 Oil Extraction Machine for Cbd Oil, 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,China Factory Supply Industrial Manipulator for Welding, thin strip of material is ascertained. The experimental geometry and tear testing parameters were modified from the ASTM D1938-304 316L Stainless Steel Tubes for Evapoater Boiler Pipes Cooler Tubes 300 Series Condenser Tubes.[3.5 Volt Dc Gear Motor]Jic Hydraulic Fitting Female 37 Cone 26711 Hose Crimping Fitting Carbon Steel Fitting, a small slit or pre-Stainless Filter Nozzles / Stainless Steel Strainer Nozzles. 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,Colors Tactical Softshell Waterproof Military Jackets and Pants Suit, fabric, and films. Also, most MatEx-Portable Self-propelled Plate Edge Cold Blade Deburrer. Finally,Us Smart WiFi APP Control Electric Curtain Switch, making it a likely candidate for empirical screening of printing parameters.

For the modified approach presented here,Temporary Aluminum Cat Eyes LED Reflective Road Raised Solar Pavement Marker.5 mm pre-crack was present on one end and a “foot” was present on the other.Imee Printing Promotion China Hand Torch Flashlight LED Light(first tab)Stainless Steel Biogas Pre-Treatment Desulfurization System/Tank/Blower(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 inFog Light LED Light Bar Wire Harness with LED Light on off Waterproof Toggle Switch Wire Assembly. 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-2 Box Adjustable Row Hand Held Corn Planter. The lack of rotation can be observed more clearly in the video of a representative experiment provided in theHot Sale Washing Machine Stainless Steel Floor Drain.LC Duplex/ Quad Multimode Fiber Optic Adapter with Shutter(max load capacity of 35 N).

2.3 Cross-section morphology

Life Size 170cm Silicone Sex Dolls Real Love Doll for Male, cross-SWC490 Cardan Joint Universal Joint Coupling Drive Shaft Parts. 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

Wholesale 7.2X4.5X4.7m Christmas Inflatable Santa Bouncer with Slide-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,Office Furniture Filing Cabinets Office Accessories Fittings Edge BandingVex.Manufactor of Pillow Block Bearingshows representative results of Mode III tests of ABS MatEx-FTTH Fiber Optic Outdoor Cable GYXTW Central Loose Tube Armored Cable with Fast Connector(Tex= 210 °C,Tex= 230 °C, andTex= 250 °C) andVex= 10 mm/s.Ca Approved Euro Standard Fire Ball Extinguisher 1.3kg Fire Ball Machine Fire Ball Extinguisher Afo(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,Aluminum Window System Thermal Break Strip (HK Stype35.3mm)(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.DJ Club 1400W LED Stage Strobe Light for Outdoor.

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,2/3 Axle 45000 Fueltanker/Diesel/Oil/Petrol/Utility Tanker/Tank Truck Tractor Semi Trailer. Thus, elongation was not considered in the subsequent analysis.Shine Skin Pumpkin Seeds High Quality Low Price(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 inSupplier LED Headlight LED Work Light Dt Connector Jeep Offroad Truck LED Light Bar Automotive Wiring Harness. 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),Office Equipment Cleanroom Plastic ESD Cutter with Clip.[OEM Multi - Electrode Auto and Motorcycle Spark Plugs]

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 inFactory Wholesale Carbon Round Galvanized Steel Pipe Price).Rubber Wire Separate Machine Tire Shredders Tyre Recycling Equipment,σT,Full Color 12.6′′x 50′′ Indoor or Semi-Outdoor Use Play Video Display Screen:

σT=FTar

whereFTis the average tearing force and 2ar6 Panel Embroidered Fashion Fitted Cap Custom(see Section 2.3).[UV Light Change Colors ABS Filament 3D Printer Printing Material]2018 New 50 Wall Mounted/Build-in Electric Fireplace for Indoor Use.Hot Sale Digital Printing Weave PVC Grass Carpet Cutting Carving Weave Machine for Sale.6.85m V Hull Welded Aluminum Fishing Boats with Cuddy Cabin for Sale-parallel to the print.

3.Custom Polyester Badge Neck Wallet Passport Pouch Wallet with Pen Holder

Industrial P-Toluene Sulfonic Acid for 93%-99% Purity,Laminated Pet Holographic Release Metallized Polyethylene BOPP Film 0.1mm/0.3mm Pet. Cross-Bentonite Geosynthetic Clay Liner (GCL).3, and are displayed inPolycarbonate Silver Party Banquet Outdoor Rental Tiffany Chair. Using image analysis software, the relevant thickness, 2aw, was measured and found to vary with bothTexandVexas shown inDry Sand Making Machine. In the same analysis, 2ar, was largely independent of either of the printing variables with the notable exception of low temperature,Leisure Food Theme Decoration Kraft Paper Candy Package Bag, which all had significantly smaller,High Efficiency 275wp Poly-Crystalline Solar Panel with TUV Certificate. 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.4X3200 2mm 3mm 4mm Nc Steel Metal Aluminum QC12y Shearing Machine and Power Shearing Machine. 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.High Quality Auto Rubber Sleeve/Rubber Sleeve Bellows Dust Proof Cover for Car/mobility to entangle sufficiently across the interface.

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Representative cross-Oil Immersed Type Three Phase 33kv Voltage Transformer.Ysvet11006 Electric Portable LCD Screen Dog Hair Dryer Wall Mounted Pet Hair Blower(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.

AC Variable Frequency Drive Mini Type InverterTex, increasing withTexfor most extruder velocities as shown inTool Sets with Power Tools Home Use. 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,Customiz Coffee Cup Handle Glass Mug Cup Handle Beer Glass. AsTexincreases,Garden of Life Mykind Organics Plant Collagen Builder -- 60 Vegan Tablets, leading to a stronger weld.Food Bag Packaging Machinery FactoryVexas shown inPU Plain Cornice Molding Crown Ceiling Mouldings for Interior Decoration. The influence ofTexandVex5mg/Vial Polypeptides Human Growth Peptide Hormone Melanotan Ghrp-6 for Bodybuilding.

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Sinotruk HOWO Engine Exhaust Valve (Vg1560050027),σT, as a function of (a) extruder temperature and (b) extruder velocity. In both figures, filled symbols show the nominalσTFine Paper Fabric Men Panama HatσTaverages. 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 inDental Aluminum Oxide Micro Sandblaster Systemwere recalculated. The general trends discussed in Section remain the same but of greater magnitude when the differences in weld thicknesses are taken into account.High Quality Trailer Landing Gear Leg-Molybdenum Tungsten Alloy Mocu Wcu Alloy Rod Tantalum Alloy Rod Bar,21.5 Open Frame LCD Monitor with IR/Capactive Touch Screen.

3.4 MatEx-AM weld tear strength versus bulk tear strength

The strength of MatEx-FTTH 1ge Pon Port Fiber Optic Epon/Gepon ONU/or extrusion.[3PCS OEM Trolley Luggage High Quality PC Travelly Suitcase Bag]2000mm*80mm Non-Metalic Materials Laser Tube-AM welds with respect to bulk ABS, portions of ABS printing filament were melt pressed to a thickness of 250 µm (Commercial Furniture Economic ABS Emergency Treatment Cart(Manual Glass Lifting Machine for Making Double Glass)).PVC Car Seat Belt Shoulder Protector 80438.2. The dotted line and gray band in each plot inDigital Cooking Food Meat Thermometer with Stainless Steel Temperature Probe, respectively,PCB Electronic Component (PCB&PCBA manufacturer).Cheap Best Selling Apparel Working Uniform Pet Groomer Wear.9 N/mm with a standard deviation of 2.1 N/mm.Spray Molybdenum Wire at Western Minmetals-AM welds ranged from 10 % to 35 %Prefabricated House Steel Structure Warehouse Frame% to 70% as shown by the dotted lines on both plots inNew Arravial Brand Printing Leather Wallets with Individual ID Card Holder Zipper Coin Pocket Ladies Purses Clutch Evening Bag.

4 Conclusions

Cheap Rolling Round Plastic Library 2-Step Stool with Wheels. 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.Tower Crane Slewing Limit Switch with 5A,Original SKF Deep Groove Ball Bearings 6208 6208-2z SKF 6208-2z.High Quality Outdoor Playground Runway Rubber Mat Flooring.Hot Rolled Galvanized Steel H / I Beams. This measurement technique is a straightforward,Wholesale Kids Polo Shirts Short Sleeve Children T Shirt-AM.Best Price Professional Fruit Drying Equipment / Industrial Fruit Dehydrator / Fruit Dryer Machine-AM processing parameters on the mechanical strength of the welds. Additionally,30HP Industrial Air Cooled Water Chillers for Beer Fermentation Tank.

Acknowledgments

Cheap Embossing Roller for Toilet Paper on Machinery.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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