scholarly journals Comparative investigation on the mechanical behavior of injection molded and 3D-printed thermoplastic polyurethane

2021 ◽  
Author(s):  
Erik Oelsch ◽  
Ralf Landgraf ◽  
Lysander Jankowsky ◽  
Martin Kausch ◽  
Stefan Hoyer ◽  
...  
Keyword(s):  
Injection Molding ◽  
Mechanical Behavior ◽  
Uniaxial Tension ◽  
Thermoplastic Polyurethane ◽  
Material Behavior ◽  
Optical Measurements ◽  
Injection Molding Process ◽  
Inelastic Material ◽  
3D Printed ◽  
Manufacturing Methods

Abstract3D printing opens up new possibilities for the production of polymeric structures that would not be possible with injection molding. However, it is known that the manufacturing method might have an impact on the mechanical properties of manufactured components. To this end, the mechanical behavior of test specimens made of thermoplastic polyurethane is compared for two different manufacturing methods. In particular, the SEAM technology (screw extrusion additive manufacturing) is compared to a conventional injection molding process. Uniaxial tension test specimens from both manufacturing methods are analyzed in two testing sequences (multi-hysteresis tests to analyze inelastic properties and uniaxial tension until rupture). To get as less perturbation as possible, the 3D-printed samples are printed with only one strand per layer. Moreover, a correction approach based on optical measurements is applied to determine the true cross-sectional area of the test specimens. The mechanical tests reveal that the inelastic material behavior is the same for both manufacturing methods. Instead, 3D-printed specimens show lower maximal stretch values at rupture and an increased variance in the results, which is related to the surface structure of 3D-printed specimens.

scholarly journals Mechanistic understanding of 3D printed polycarbonate process yielding comparable dielectric strength with injection molding process

2020 ◽  
Vol 2 (7) ◽  
Author(s):  
Anshita Sudarshan ◽  
S. M. Swamy ◽  
Nitesh Shet ◽  
Hari Prasad ◽  
Juha-Matti Levasalmi ◽  
...  
Keyword(s):  
Injection Molding ◽  
Dielectric Strength ◽  
Injection Molding Process ◽  
Molding Process ◽  
3D Printed ◽  
Mechanistic Understanding

scholarly journals Correlation between the Flow and Curing Behavior of Hard Magnetic Fillers in Thermosets and the Magnetic Properties

Magnetism ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 37-57
Author(s):  
Uta Rösel ◽  
Dietmar Drummer
Keyword(s):  
Magnetic Properties ◽  
Injection Molding ◽  
Epoxy Resin ◽  
Creep Behavior ◽  
Magnetic Particles ◽  
Material Behavior ◽  
Injection Molding Process ◽  
Molding Process ◽  
Curing Behavior ◽  
The Impact

Polymer bonded magnets based on thermoplastics are economically produced by the injection molding process for applications in sensor and drive technology. Especially the lack of orientation in the edge layer, as well as the chemical resistance and the creep behavior limit the possible implementations of thermoplastic based polymer bonded magnets. However, thermoset based polymer bonded magnets have the opportunity to expand the applications by complying with the demands of the chemical industry or pump systems through to improved chemical and thermal resistance, viscosity and creep behavior of thermosets. This paper investigates the influence of hard magnetic particles on the flow and curing behavior of highly filled thermoset compounds based on an epoxy resin. The basic understanding of the behavior of those highly filled hard magnetic thermoset systems is essential for the fabrication of polymer bonded magnets based on thermosets in the injection molding process. It is shown that several factors like the crystal structure, the particle shape and size, as well as the thermal conductivity and the adherence between filler and matrix influence the flow and curing behavior of highly filled thermoset compounds based on epoxy resin. However, these influencing factors can be applied to any filler system with respect to a high filler amount in a thermoset compound, as they are based on the material behavior of particles. Further, the impact of the flow and curing behavior on the magnetic properties of polymer bonded magnets based on thermosets is shown. With that, the correlation between material based factors and magnetic properties within thermosets are portrayed.

scholarly journals Performance Analysis of Enhanced 3D Printed Polymer Molds for Metal Injection Molding Process

Metals ◽  
2018 ◽  
Vol 8 (6) ◽  
pp. 433 ◽  
Author(s):  
Khurram Altaf ◽  
Junaid Qayyum ◽  
A. Rani ◽  
Faiz Ahmad ◽  
Puteri Megat-Yusoff ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Injection Molding ◽  
Metal Injection Molding ◽  
Injection Molding Process ◽  
Molding Process ◽  
3D Printed

Study on Technology of Filter Made by Engineering Grade Thermoplastic Polyurethane

2011 ◽  
Vol 217-218 ◽  
pp. 746-751
Author(s):  
Jia Min Zhang
Keyword(s):  
Injection Molding ◽  
Raw Materials ◽  
Thermoplastic Polyurethane ◽  
Decomposition Temperature ◽  
Raw Material ◽  
Injection Molding Process ◽  
Polyurethane Elastomer ◽  
Molding Process ◽  
Thermoplastic Polyurethane Elastomer ◽  
Filter Housing

This paper introduced the different classifications and advantages of the project level thermoplastic polyurethane elastomer ,and according to the injection molding process of raw materials Isoplast 302EZ and thermoplastic polyurethane elastomer, from raw material preparation, injection machine selection, tooling selection, molding conditions, and introduced TPU injection molding process .The filter housing of TPU were briefly discussed from the design goals, technical characteristics, performance analysis. Combination of typical products, we studied the technology of the production of the thermoplastic polyurethane flexible filter housing. The results showed that the material should be pre-dried in a vacuum, and the time, temperature and pressure should be controlled properly. It should be pay attention that the specification of the waste and the raw materials should be the same, when recycling and on the other hand, the quality of the productions should be improved and no pollution should be ensure during the process; to avoid the decomposition temperature and the products aging, we should empty the material or stop the machine during it doesn’t work.

Multi-Material FDM 3D Printing Process Parameter Development Based on Bending Test Characterization

2019 ◽  
Author(s):  
Heather L. Lai ◽  
Aaron Nelson
Keyword(s):  
Mechanical Behavior ◽  
Axial Strain ◽  
Low Cost ◽  
Thermoplastic Polyurethane ◽  
Bending Test ◽  
Internal Damping ◽  
Material Interfaces ◽  
Material Interface ◽  
Fused Deposition ◽  
3D Printed

Abstract The purpose of this investigation is to study the effects of perimeter inflation on the dynamic behavior of a flexible / rigid multi-material interface. The results of this study can be applied to applications where there is a need for low cost, multi-material 3D printed parts which have both flexibility and strength at the material interfaces designed to undergo simultaneous axial strain and flexural strain. A non-homogeneous 3D printed structure with the desired static and dynamic mechanical behavior was designed using a flexible thermoplastic polyurethane substrate (NinjaFlex) and stiff ABS segment. The multi-material part was printed using a consumer grade dual extruder desktop FDM 3D printer. This project focused on the evaluation of the mechanical behavior of the 3D multi-material due to delamination at the interfaces between the materials undergoing simultaneous flexural and axial loading. In order to reduce the occurrences of delamination, overlap at the interfaces was imposed by using perimeter inflation of both the two different materials. The purpose of the project was to develop a test methodology for the evaluation of the use of perimeter inflation in order to improve the behavior of the multi-material fused deposition printed parts. A modified 3 point bending test was developed to measure the equivalent stiffness and internal damping of the material interface. As a result of this testing, increasing the perimeter inflation was found to cause a modest increase in the stiffness of the interface, with little effect on the internal damping of the interface.

scholarly journals A Computational Geometry Generation Method for Creating 3D Printed Composites and Porous Structures

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2507
Author(s):  
Petros Siegkas
Keyword(s):  
Additive Manufacturing ◽  
Composite Structures ◽  
Thermoplastic Polyurethane ◽  
Voronoi Cell ◽  
Computational Method ◽  
Voronoi Cells ◽  
Potential Applications ◽  
3D Printed ◽  
Manufacturing Methods ◽  
Single Material

A computational method for generating porous materials and composite structures was developed and implemented. The method is based on using 3D Voronoi cells to partition a defined space into segments. The topology of the segments can be controlled by controlling the Voronoi cell set. The geometries can be realized by additive manufacturing methods, and materials can be assigned to each segment. The geometries are generated and processed virtually. The macroscopic mechanical properties of the resulting structures can be tuned by controlling microstructural features. The method is implemented in generating porous and composite structures using polymer filaments i.e., polylactic acid (PLA), thermoplastic polyurethane (TPU) and nylon. The geometries are realized using commercially available double nozzle fusion deposition modelling (FDM) equipment. The compressive properties of the generated porous and composite configurations are tested quasi statically. The structures are either porous of a single material or composites of two materials that are geometrically intertwined. The method is used to produce and explore promising material combinations that could otherwise be difficult to mix. It is potentially applicable with a variety of additive manufacturing methods, size scales, and materials for a range of potential applications.

An Analysis of Interfacial Adhesion Between TPU/MWCNT Composites and ABS Substrate by Over Injection Molding

2016 ◽  
Author(s):  
Catalin Fetecau ◽  
Felicia Stan ◽  
Nicoleta Violeta Cristea ◽  
Laurentiu Ionut Sandu
Keyword(s):  
Carbon Nanotubes ◽  
Injection Molding ◽  
Flow Behavior ◽  
Thermoplastic Polyurethane ◽  
Acrylonitrile Butadiene Styrene ◽  
Injection Molding Process ◽  
Molding Process ◽  
Melt Temperature ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

In this work, the advantages of Thermoplastic Polyurethane (TPU) filled with multi-walled carbon nanotubes (MWCNTs) were combined with those of the over injection molding process in order to obtain two-component (2k) structures with very different but high mechanical and electrical properties. TPU/MWCNT composites with different MWCNTs wt.% were over-molded onto Acrylonitrile Butadiene Styrene (ABS) substrates, under different processing conditions, and the adhesion was assessed by T-peel tests at room temperature. Since adhesion is also related to flow behavior, the rheological properties were studied with a capillary rheometer at shear rates similar to those of the injection molding process (102∼104s−1). Experimental results indicated that the most effective way to control the adhesion between the ABS substrate and the over-molded TPU/MWCNT composite is to increase the melt temperature. The addition of carbon nanotubes improves adhesion in the vicinity of 0.5 wt.% MWCNTs.

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