scholarly journals Formulation of a Model Resin System for Benchmarking Processing-Property Relationships in High-Performance Photo 3D Printing Applications

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4109
Author(s):  
Jianwei Tu ◽  
Kamran Makarian ◽  
Nicolas J. Alvarez ◽  
Giuseppe R. Palmese
Keyword(s):  
3D Printing ◽  
High Performance ◽  
Mechanical Analysis ◽  
Resin System ◽  
Processing Property ◽  
High Mechanical Strength ◽  
Reinforced Composite ◽  
And Performance ◽  
Tan Δ

A well-defined resin system is needed to serve as a benchmark for 3D printing of high-performance composites. This work describes the design and characterization of such a system that takes into account processability and performance considerations. The Grunberg–Nissan model for resin viscosity and the Fox equation for polymer Tg were used to determine proper monomer ratios. The target viscosity of the resin was below 500 cP, and the target final Tg of the cured polymer was 150 °C based on tan-δ peak from dynamic mechanical analysis. A tri-component model resin system, termed DA-2 resin, was determined and fully characterized. The printed polymer exhibited good thermal properties and high mechanical strength after post-cure, but has a comparatively low fracture toughness. The model resin will be used in additive manufacturing of fiber reinforced composite materials as well as for understanding the fundamental processing–property relationships in light-based 3D printing.

scholarly journals Process-Induced Distortions Characterization of MBWK Fabric Reinforced Composite Helmet Shell

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 2983
Author(s):  
He Xiang ◽  
Yaming Jiang ◽  
Yexiong Qi ◽  
Jialu Li
Keyword(s):  
Thin Shell ◽  
High Performance ◽  
Laser Scanning ◽  
Textile Composites ◽  
Reinforced Composite ◽  
Measurement Results ◽  
Calculation Results ◽  
High Performance Composite ◽  
Working Procedure

In order to characterize the process-induced distortions of 3D thin shell composites with complex shape, the multilayered biaxial weft knitted (MBWK) fabric reinforced high-performance composite helmet was selected as the research object, and the 3D laser scanning machine was used to scan the helmet surface, then the 3D scanning data was compared with the CAD model to evaluate the deformation. The results and discussion indicated that the conventional method was workable, but the speed of convergence was slow and the calculation results were easy to drop into local optimization. According to detailed analysis, a measurement method focusing on the principle of “Feature Distance” was developed. The measurement results shown that this method can not only give accurate results, but also reduce working procedure and greatly save the computing resources, which is proved to be a feasible approach for the deformation measurement foundation of 3D thin shell textile composites.

scholarly journals Design and characterization of a 3D-printed staggered herringbone mixer

BioTechniques ◽  
2021 ◽  
Author(s):  
Vedika J Shenoy ◽  
Chelsea ER Edwards ◽  
Matthew E Helgeson ◽  
Megan T Valentine
Keyword(s):  
3D Printing ◽  
High Throughput ◽  
Low Cost ◽  
Microfluidic Devices ◽  
Device Design ◽  
Replica Molding ◽  
3D Printed ◽  
And Performance ◽  
To Receive

3D printing holds potential as a faster, cheaper alternative compared with traditional photolithography for the fabrication of microfluidic devices by replica molding. However, the influence of printing resolution and quality on device design and performance has yet to receive detailed study. Here, we investigate the use of 3D-printed molds to create staggered herringbone mixers (SHMs) with feature sizes ranging from ∼100 to 500 μm. We provide guidelines for printer calibration to ensure accurate printing at these length scales and quantify the impacts of print variability on SHM performance. We show that SHMs produced by 3D printing generate well-mixed output streams across devices with variable heights and defects, demonstrating that 3D printing is suitable and advantageous for low-cost, high-throughput SHM manufacturing.

Preparation and performance characterization of a novel high-performance epoxy resin modified reactive liquid asphalt

2020 ◽  
Vol 263 ◽  
pp. 120113
Author(s):  
Zhu Zhang ◽  
Jiusu Li ◽  
Zhengyuan Wang ◽  
Shiyu Long ◽  
Shunjun Jiang ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
High Performance ◽  
Performance Characterization ◽  
Reactive Liquid ◽  
And Performance

scholarly journals Research on the composition of UV curing modified compounds for 3D printing based on HyperChem simulation

2021 ◽  
Vol 2076 (1) ◽  
pp. 012052
Author(s):  
Weicheng Bai ◽  
Mengxiao Tao ◽  
Xianfeng Zhang ◽  
Jun Dong
Keyword(s):  
3D Printing ◽  
Theoretical Basis ◽  
High Performance ◽  
Reaction System ◽  
Uv Curing ◽  
Ceramic Materials ◽  
Energy Calculation ◽  
Resin System ◽  
Reaction Enthalpy ◽  
Curing Reaction

Abstract The precursor conversion method provides the possibility of 3D printing ceramic materials, and the resin system with polysilazane as the precursor is expected to prepare high-performance ceramic materials for aviation. In this paper, the UV curing reaction system of polysilazane for 3D printing is taken as the research object, and hyperchem8.0 software is used as the research means. The model construction, chemical bond energy calculation, reaction enthalpy calculation and other modules in the software are used to simulate and predict the reaction process and mechanism of UV curing, which provides a theoretical basis for the selection and optimization of the subsequent UV curing reaction system for 3D printing.

scholarly journals Comparing Performance of 3D-Printed and Injection-Molded Fiber-Reinforced Composite Parts in Ring-Spinning Traveler Application

Technologies ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 75
Author(s):  
S. M. Fijul Kabir ◽  
Kavita Mathur ◽  
Abdel-Fattah M. Seyam
Keyword(s):  
High Performance ◽  
Surface Characteristics ◽  
Fiber Reinforced ◽  
Ring Spinning ◽  
Reinforced Composite ◽  
3D Printed ◽  
Recent Addition ◽  
Injection Molded ◽  
And Performance ◽  
Material Fabrication

Fiber-reinforced 3D printing (3DP) technology is a recent addition to the material extrusion-based 3DP process unlocking huge potential to apply this technology for high-performance material fabrication with complex geometries. However, in order to take the full advantage of this technology, a comparative analysis with existing technologies targeting a particular application is necessary to understand its commercial applicability. Here, an applied composite part, ring-spinning travelers, has been developed using the unique design features of fiber-reinforced 3DP technology that is beyond the capability of the currently used technology; the injection molding, quality, and performance of the printed and molded travelers were investigated and compared. The results demonstrated that fiber-reinforced 3DP is a promising technology that offers a lot of flexibility regarding reinforcement patterns and materials including both short and continuous fibers to tailor the performance, although the printed travelers showed poorer surface characteristics and wear resistance than the molded travelers. Based on the present analysis, a number of recommendations have been proposed on the design of the traveler to apply the technology effectively and use the printer to improvise and manipulate the performance of the travelers.

Fabrication and Characterization of a Balloon Actuator Array for Haptic Feedback in Robotic Surgery

2008 ◽  
Vol 2 (4) ◽  
Author(s):  
Chih-Hung King ◽  
Miguel Franco ◽  
Martin O. Culjat ◽  
Adrienne T. Higa ◽  
James W. Bisley ◽  
...  
Keyword(s):  
Robotic Surgery ◽  
High Performance ◽  
Visual Cues ◽  
Sensory Input ◽  
Haptic Feedback ◽  
Inflation Pressure ◽  
Actuator Arrays ◽  
Compact Size ◽  
And Performance

Robot-assisted surgery is characterized by a total loss of haptic feedback, requiring surgeons to rely solely on visual cues. A pneumatically-driven balloon actuator array, suitable for mounting on robotic surgical master controls, has been developed to provide haptic feedback to surgeons. The actuator arrays consist of a molded polydimethylsiloxane substrate with cylindrical channels and a spin-coated silicone film that forms the array of balloons. Preliminary human perceptual studies have demonstrated that balloon diameters greater than 1.0mm may provide effective haptic feedback to the index finger. Before conducting further human perceptual tests, refinements of the fabrication process and performance data of the actuator are required. Balloons with diameters ranging between 1.5mm and 4.0mm were fabricated with film thicknesses of 200μm and 300μm. Inflation pressure versus balloon deflection tests and cyclic actuation tests were performed to characterize each balloon type. The results demonstrated a high linearity between inflation pressure and balloon deflection (R2>0.93) and negligible hysteresis effects between inflation and deflation over 100,000cycles. The studies indicated that 300μm films are optimal for 3.0mm and 4.0mm diameter balloons, and 200μm films are optimal for 1.5mm, 2.0mm, and 2.5mm diameter balloons. Due to its compact size and high performance, the described pneumatic actuator can provide sensory input that is otherwise unavailable during robotic surgery.

scholarly journals Development and Characterization of Anticorrosion and Antifriction Properties for High Performance Polyurethane/Graphene Composite Coatings

Coatings ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 250 ◽  
Author(s):  
Pei-Ying Tsai ◽  
Tzu-En Chen ◽  
Yueh-Lien Lee
Keyword(s):  
Corrosion Resistance ◽  
High Performance ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Salt Spray ◽  
Mechanical Analysis ◽  
Mechanical Tests ◽  
Antifriction Properties ◽  
The Coefficient Of Friction

This work contributes to the development and characterization of the corrosion resistance and antifriction properties of high performance polyurethane (PU)/graphene (Gr) composite coating. In this study, PU composite coatings containing 0, 2, 4 and 8 wt.% of Gr were prepared and evaluated using various corrosion and mechanical tests, namely electrochemical impedance spectroscopy, salt spray tests, cross-cut tape tests and dynamic mechanical analysis. Antifriction properties of the coatings were evaluated using a tribometer with a ball-on-disc mode at room temperature. The corrosion resistance and adhesion property of the PU coatings were found to be enhanced by adding 4 and 8 wt.% of Gr. The coefficient of friction revealed that the antifriction properties of the PU/Gr composite coatings were 61% lower than those of the conventional coating when the Gr content was increased to 8 wt.%.

Cycloaliphatic Epoxide Based Sol-Gel Derived Materials

1994 ◽  
Vol 346 ◽  
Author(s):  
G. A. Sigel ◽  
R.C. Domszy ◽  
W. C. Welch
Keyword(s):  
High Performance ◽  
Sol Gel ◽  
Mechanical Analysis ◽  
Processing Conditions ◽  
Coating Materials ◽  
Uv Curable ◽  
Organic Hybrid ◽  
High Performance Coating ◽  
Gel Composition

ABSTRACTScratch resistant transparent organically modified sol-gel materials typically utilize organics as acrylates, or pre-polymer silicon or carbon backbone material. The use of diepoxide monomers within a sol-gel matrix has yet to be described as a means of obtaining high performance coating materials. This paper describes the preparation and characterization of UV curable inorganic-organic hybrid glass materials based on the incorporation of cycloaliphatic diepoxide monomers into a sol-gel composition of TEOS and the epoxide silane coupling agent glycidoxypropyl-trimethoxysilane. We report aging and humidity studies along with processing conditions that affect the silicate distribution and cationic cure of the diepoxide resin based on solution and solid state NMR experiments. Mechanical analysis of thin films prepared by varying processing conditions and length of the diepoxide backbone are also discussed.

scholarly journals Towards an Autonomous Framework for HPC Optimization: Using Machine Learning for Energy and Performance Modeling

2019 ◽  
Author(s):  
Vinícius Klôh ◽  
Matheus Gritz ◽  
Bruno Schulze ◽  
Mariza Ferro
Keyword(s):  
Machine Learning ◽  
Energy Efficiency ◽  
Energy Consumption ◽  
Energy Saving ◽  
High Performance ◽  
Performance Modeling ◽  
Application Performance ◽  
Ongoing Research ◽  
And Performance

Performance and energy efficiency are now critical concerns in high performance scientific computing. It is expected that requirements of the scientific problem should guide the orchestration of different techniques of energy saving, in order to improve the balance between energy consumption and application performance. To enable this balance, we propose the development of an autonomous framework to make this orchestration and present the ongoing research to this development, more specifically, focusing in the characterization of the scientific applications and the performance modeling tasks using Machine Learning.

scholarly journals Use of Dynamic Mechanical Analysis (DMA) for Characterizing Interfacial Interactions in Filled Polymers

Solids ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 108-120
Author(s):  
Muhammad Ahsan Bashir
Keyword(s):  
Dynamic Mechanical Analysis ◽  
Viscoelastic Behavior ◽  
Mechanical Analysis ◽  
Organic Coatings ◽  
Interfacial Interactions ◽  
Filled Polymers ◽  
Dynamic Mechanical ◽  
And Performance ◽  
Tan Δ ◽  
Peak Value

Dynamic mechanical analysis (DMA) provides reliable information about the viscoelastic behavior of neat and filled polymers. The properties of filled polymers are relevant to different industries as protective organic coatings, composites etc. Interfacial interactions in filled polymers play an important role in determining their bulk properties and performance during service life. In this brief review article, studies that used DMA to characterize the interfacial interactions in filled polymers have been reviewed. The available open literature provides a mixed opinion about the influence of interfacial interactions on the glass transition temperature of filled polymers. Nevertheless, it appears that in the case of strong interfacial interactions between the filler particles and the polymeric matrix, the peak value of tan δ is reduced in comparison to that of a filled polymer where these interactions are weak.

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