scholarly journals Improved epoxy thermosets by the use of poly(ethyleneimine) derivatives

2017 ◽  
Vol 2 (8) ◽  
Author(s):  
Cristina Acebo ◽  
Xavier Ramis ◽  
Angels Serra
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resins ◽  
High Performance ◽  
Polymer Network ◽  
General Purpose ◽  
High Adhesion ◽  
Hyperbranched Poly ◽  
Fiber Reinforced Materials ◽  
Wide Range ◽  
Good Heat

Abstract Epoxy resins are commonly used as thermosetting materials due to their excellent mechanical properties, high adhesion to many substrates and good heat and chemical resistances. This type of thermosets is intensively used in a wide range of fields, where they act as fiber-reinforced materials, general-purpose adhesives, high-performance coatings and encapsulating materials. These materials are formed by the chemical reaction of multifunctional epoxy monomers forming a polymer network produced through an irreversible way. In this article the improvement of the characteristics of epoxy thermosets using different hyperbranched poly(ethyleneimine) (PEI) derivatives will be explained.

Interpenetrating Covalent Adaptable Networks with Enhanced Mechanical Properties and Facile Reprocessability and Recyclability

2021 ◽  
Author(s):  
Yufeng Lei ◽  
Anqiang Zhang ◽  
Yaling Lin
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Polymer Network ◽  
Continuous Phase ◽  
Interpenetrating Polymer Network

Blending polymers has always been a critical strategy toward high-performance materials. By creating interpenetrating polymer network (IPN), the incompatibility of different polymers could be overcome and a favorable bi-continuous phase...

scholarly journals Multi-Softcore Architecture on FPGA

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Mouna Baklouti ◽  
Mohamed Abid
Keyword(s):  
High Performance ◽  
Design Methodology ◽  
Matrix Multiplication ◽  
Rapid Prototype ◽  
General Purpose ◽  
Parallel Applications ◽  
Multicore Systems ◽  
Processor Core ◽  
Nios Ii ◽  
Wide Range

To meet the high performance demands of embedded multimedia applications, embedded systems are integrating multiple processing units. However, they are mostly based on custom-logic design methodology. Designing parallel multicore systems using available standards intellectual properties yet maintaining high performance is also a challenging issue. Softcore processors and field programmable gate arrays (FPGAs) are a cheap and fast option to develop and test such systems. This paper describes a FPGA-based design methodology to implement a rapid prototype of parametric multicore systems. A study of the viability of making the SoC using the NIOS II soft-processor core from Altera is also presented. The NIOS II features a general-purpose RISC CPU architecture designed to address a wide range of applications. The performance of the implemented architecture is discussed, and also some parallel applications are used for testing speedup and efficiency of the system. Experimental results demonstrate the performance of the proposed multicore system, which achieves better speedup than the GPU (29.5% faster for the FIR filter and 23.6% faster for the matrix-matrix multiplication).

An Analysis on the Tensile Strength of Hybridized Reinforcement Filament Yarns by Commingling Process

2007 ◽  
Vol 539-543 ◽  
pp. 974-978
Author(s):  
Chathura Nalendra Herath ◽  
Beong Bok Hwang ◽  
B.S. Ham ◽  
Jung Min Seo ◽  
Bok Choon Kang
Keyword(s):  
Mechanical Properties ◽  
Glass Matrix ◽  
High Performance ◽  
Glass Fibers ◽  
Tensile Force ◽  
Matrix Material ◽  
General Purpose ◽  
Practical Applications ◽  
Advantages And Disadvantages ◽  
Glass Matrices

Carbon, aramid and glass fibers are inherently superior to conventional textile fibers in terms of mechanical properties as well as other chemical characteristics. Because of inherent advantages and disadvantages associated with each material, it is generally better to hybridize them to fully benefit of their high performance in many practical applications. In this paper, the possibility of hybridizing Carbon/Aramid-, Carbon/Glass- and Aramid/Glass- matrices has been investigated through the commingling process. In the experiment, several process parameters were selected and they include pressure, yarn oversupply-rate and different nozzle types. As a result of experiments, it was concluded that the hybridized materials has shown better performance than individual reinforced filament yarns in terms of mechanical properties. For small tensile forces, the Carbon/Glass/matrix combination turned out to be good enough for general purpose applications. However, for high tensile applications, Carbon/Aramid or Aramid/Glass with matrix combinations was better than the other material combinations. The hybridization process was also investigated under an air pressure of 5 bar, a yarn oversupply-rate of 1.5% for reinforced filaments, and 3.5% to 6% for matrix materials, respectively. It was also shown from the experimental results that Carbon/Glass/matrix combination may be desirable for small tensile force applications and Carbon/Aramid/matrix and Glass/Aramid/matrix combinations most suitable for heavy tensile force applications, respectively. As a matrix material, polypropylene and polyester have shown better performance than polyether-ether-keeton in terms of tensile property.

scholarly journals Structure and Properties of a Metallocene Polypropylene Resin with Low Melting Temperature for Melt Spinning Fiber Application

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 729
Author(s):  
Renwei Xu ◽  
Peng Zhang ◽  
Hai Wang ◽  
Xu Chen ◽  
Jie Xiong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Melting Temperature ◽  
High Performance ◽  
Melt Spinning ◽  
Deep Understanding ◽  
Metallocene Catalyst ◽  
Fiber Spinning ◽  
X Ray Diffraction ◽  
Wide Range ◽  
Two Samples

An isotactic polypropylene (iPP-1) resin with low melting temperature (Tm) is synthesized by a metallocene catalyst and investigated for melt-spun fiber applications. The structure, thermal and mechanical properties, and feasibility of producing fibers of a commercial metallocene iPP (iPP-2) and a conventional Ziegler–Natta iPP (iPP-3) are carefully examined for comparison. Tm of iPP-1 is about 10 °C lower than the other two samples, which is well addressed both in the resin and the fiber products. Besides, the newly developed iPP-1 possesses higher isotacticity and crystallinity than the commercial ones, which assures the mechanical properties of the fiber products. Thanks to the addition of calcium stearate, its crystal grain size is smaller than those of the two other commercial iPPs. iPP-1 shows a similar rheological behavior as the commercial ones and good spinnability within a wide range of take-up speeds (1200–2750 m/min). The tensile property of fibers from iPP-1 is better than commercial ones, which can fulfill the application requirement. The formation of the mesomorphic phase in iPP-1 during melt spinning is confirmed by the orientation and crystallization investigation with wide angle X-ray diffraction (WAXD), which is responsible for its excellent processing capability and the mechanical properties of the resultant fibers. The work may provide not only a promising candidate for the high-performance PP fiber but also a deep understanding of the formation mechanism of the mesomorphic phase during fiber spinning.

ISO-CAST 8

Alloy Digest ◽  
1968 ◽  
Vol 17 (10) ◽  
Keyword(s):  
Mechanical Properties ◽  
Machine Tool ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
General Purpose ◽  
Structural Alloy ◽  
Wide Range ◽  
Molybdenum Steel ◽  
Steel Castings

Abstract ISO-CAST 8 is a cast chromium-molybdenum steel recommended as a general purpose structural alloy of wide application with wide range of mechanical properties. It is used for aircraft and railroad car parts, machine tool and hammermill equipment, gears and shafts. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on casting, heat treating, machining, and joining. Filing Code: SA-232. Producer or source: Empire Steel Castings Inc..

SANDMEYER ALLOY 410 (UNS S41000)

Alloy Digest ◽  
2020 ◽  
Vol 69 (3) ◽  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Martensitic Stainless Steel ◽  
High Strength ◽  
General Purpose ◽  
Steel Company ◽  
Good Corrosion Resistance ◽  
Heat Treated ◽  
Wide Range

Abstract Sandmeyer Alloy 410 (UNS S41000) is a general purpose 12% chromium martensitic stainless steel that can be heat treated to obtain a wide range of mechanical properties. This alloy possesses good corrosion resistance along with high strength and hardness. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, machining, and joining. Filing Code: SS-1316. Producer or source: Sandmeyer Steel Company.

Local Dissipative Processes in the Epoxy Component

2021 ◽  
Vol 899 ◽  
pp. 688-693
Author(s):  
Viktor A. Lomovskoy ◽  
Anna S. Shorshina ◽  
Igor D. Simonov-Emelyanov ◽  
Anastasia A. Razzhivina
Keyword(s):  
Mechanical Properties ◽  
Dielectric Properties ◽  
Epoxy Resins ◽  
Chemical Resistance ◽  
Physical And Mechanical Properties ◽  
Dissipative Processes ◽  
High Adhesion

It is known that epoxy resins (ES) and materials based on them are widely used in various areas of natural economy due to their valuable properties: low shrinkage during curing, high adhesion to various materials, chemical resistance, good physical and mechanical properties, and excellent dielectric properties [1].

scholarly journals A SURVEY OF TECHNIQUES FOR MANAGING AND LEVERAGING CACHES IN GPUs

2014 ◽  
Vol 23 (08) ◽  
pp. 1430002 ◽  
Author(s):  
SPARSH MITTAL
Keyword(s):  
Graphics Processing Units ◽  
High Performance ◽  
Heterogeneous Computing ◽  
General Purpose ◽  
System Level ◽  
Cache Management ◽  
Full Potential ◽  
Wide Range ◽  
Computing Platforms ◽  
Graphics Processing

Initially introduced as special-purpose accelerators for graphics applications, graphics processing units (GPUs) have now emerged as general purpose computing platforms for a wide range of applications. To address the requirements of these applications, modern GPUs include sizable hardware-managed caches. However, several factors, such as unique architecture of GPU, rise of CPU–GPU heterogeneous computing, etc., demand effective management of caches to achieve high performance and energy efficiency. Recently, several techniques have been proposed for this purpose. In this paper, we survey several architectural and system-level techniques proposed for managing and leveraging GPU caches. We also discuss the importance and challenges of cache management in GPUs. The aim of this paper is to provide the readers insights into cache management techniques for GPUs and motivate them to propose even better techniques for leveraging the full potential of caches in the GPUs of tomorrow.

scholarly journals [ANT]: A Machine Learning Approach for Building Performance Simulation: Methods and Development

2019 ◽  
Vol 3 (1) ◽  
pp. 205
Author(s):  
Mahmoud M. Abdelrahman ◽  
Ahmed Mohamed Yousef Toutou
Keyword(s):  
Machine Learning ◽  
High Performance ◽  
General Purpose ◽  
Ease Of Use ◽  
Building Performance ◽  
Performance Simulation ◽  
Building Performance Simulation ◽  
Wide Range ◽  
Performance Development ◽  
High Level

In this paper, we represent an approach for combining machine learning (ML) techniques with building performance simulation by introducing four methods in which ML could be effectively involved in this field i.e. Classification, Regression, Clustering and Model selection . Rhino-3d-Grasshopper SDK was used to develop a new plugin for involving machine learning in design process using Python programming language and making use of scikit-learn module, that is, a python module which provides a general purpose high level language to nonspecialist user by integration of wide range supervised and unsupervised learning algorithms with high performance, ease of use and well documented features. ANT plugin provides a method to make use of these modules inside Rhino\Grasshopper to be handy to designers. This tool is open source and is released under BSD simplified license. This approach represents promising results regarding making use of data in automating building performance development and could be widely applied. Future studies include providing parallel computation facility using PyOpenCL module as well as computer vision integration using scikit-image.

Strain rate dependence of a crash resistant adhesive as a function of temperature for the automotive industry

2019 ◽  
Vol 233 (11) ◽  
pp. 2189-2203 ◽  
Author(s):  
JJM Machado ◽  
A Hayashi ◽  
PDP Nunes ◽  
EAS Marques ◽  
RJC Carbas ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Strain Rate ◽  
Automotive Industry ◽  
High Performance ◽  
Dissimilar Materials ◽  
Safety Standards ◽  
Wide Range ◽  
Diverse Application ◽  
Cohesive Laws ◽  
Materials Used

The wide and diverse application of adhesives in the automotive industry has increased over the last decades, driven by the need to produce efficient yet strong vehicles, able to meet both fuel economy and safety standards. This method allows to bond a variety of dissimilar materials used for structural parts, as well as to achieve lighter structures, and higher failure loads over other traditional methods such as fastening or welding. It is therefore important to understand the behaviour of adhesives under a wide range of strain rates and temperatures. These data are fundamental to ensure vehicle safety, as adhesives must be able to sustain impact conditions, deforming but at the same time keeping the integrity of the structure and transmitting the loads without damaging the joint. The aim and novelty of this work is the complete mechanical characterization of a high-performance crash resistant adhesive under varied strain rate and temperature conditions, necessary for the validation of structures used in the automotive industry. The mechanical behaviour of these materials is still poorly understood and described in the literature. The results showed a change in the mechanical properties of the adhesive with the variation of strain rate (quasi-static and impact of 3 m/s) and temperature (−30, 24 and 80 ℃). With the mechanical properties determined it was possible to define cohesive laws for implementation in finite element simulation, as a function of strain rate and temperature.

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