Analysis of Fragmentation of Glass Target with Composite Properties of Materials under Impact Loading

2012 ◽  
Vol 600 ◽  
pp. 226-229
Author(s):  
Xiao Qing Yu ◽  
Mao Lin ◽  
Na Wei ◽  
Li Jia ◽  
Jing Xiao
Keyword(s):  
Impact Loading ◽  
Properties Of Materials ◽  
Glass Target ◽  
Radial Cracks ◽  
Composite Properties

Glass target belongs to brittle target.In order to make use of PVC to enhance defensible performance of glass, combining glass and PVC for a target is considered in this paper. On the basis of experiment, fragmentation of glass faceplate is two adding cones. The relation of the fragmentation shape and thickness of glass is, analysed.So we can make the conclusion that the glass is thicker, the radial cracks and annulus cracks are denser.If it is applied to defend the structure, the better effect of defensible performance is testified when the more energy is absorbed.

Study on Stress Measurement of the MSG Magnetic Measurement Stress Sensor Based on Composite Properties of Materials

2013 ◽  
Vol 668 ◽  
pp. 101-104
Author(s):  
Tie Liu Wang ◽  
Zhong Yi Wang ◽  
Wei Wan
Keyword(s):  
Working Conditions ◽  
Stress Measurement ◽  
Theoretical Calculations ◽  
Magnetic Measurement ◽  
Good Correspondence ◽  
Stress Sensor ◽  
The Core ◽  
Properties Of Materials ◽  
Magneto Resistance ◽  
Composite Properties

The magnetic measurement stress sensor is the core of the magnetic measurement stress technology. Magnetic measurement stress sensor using magnetostriction and Giant Magneto Resistance (GMR) theory has good correspondence between stress and magnetic, and been validated scientific and reliable through indoor experiments and engineering applications. This paper gives a method on stress sensor anode calibration, verifies the different performance of the sensor based on different materials, makes an analysis of the error between the theoretical calculations and actual measurements of the standard objects, describes the working conditions of using the sensor and indicates a reasonable match is a prerequisite to obtain the desired signal processing results.

scholarly journals Study of Thermal, Mechanical and Barrier Properties of Biodegradable PLA/PBAT Films with Highly Oriented MMT

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7189
Author(s):  
Joanna Ludwiczak ◽  
Stanisław Frąckowiak ◽  
Karol Leluk
Keyword(s):  
Oxygen Permeability ◽  
Barrier Properties ◽  
Extrusion Process ◽  
Chain Extender ◽  
Biodegradable Material ◽  
Melt Mixing ◽  
Orientation Process ◽  
Properties Of Materials ◽  
A Chain ◽  
Composite Properties

In order to improve the properties of biodegradable polylactide (PLA), mixtures with polybutylene adipate-co-terephthalate (PBAT) were prepared. PLA is a bio-based and renewable biodegradable material, made from starch. PBAT is a biodegradable polyester for compostable film. In order to improve the composite properties, two types of additives were implemented via melt mixing, a chain extender (CE) and montmorillonite (MMT). CE was used as an interfacial modifier to enhance the adhesion between components. Montmorillonite is a widely studied clay added to polymer nanocomposites. Due to the lamellar structure, it improves the barrier properties of materials. PLA/PBAT films were oriented in the extrusion process and the amounts of filler introduced into the PLA/PBAT nanocomposites were 1.0, 3.0, and 5.0%. The improvement in the PLA barrier properties by the addition of PBAT and 5% of MMT was confirmed as the oxygen permeability decreased almost by a factor of 3. The addition of the biodegradable polymer, chain extender, montmorillonite, and the implemented orientation process resulted in a decrease in composite viscosity and an increase in the PLA crystallinity percentage (up to 25%), and the wettability tests confirmed the synergic behavior of the selected polymer blend.

Molding Process and Development of Large Carbon Fiber of Fan Blades with Composite Properties of Materials

2012 ◽  
Vol 600 ◽  
pp. 157-160 ◽  
Author(s):  
Juan Wang ◽  
Si Yu Lai ◽  
Fan Xiao Li
Keyword(s):  
Carbon Fiber ◽  
Wind Power ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Forming Process ◽  
Molding Process ◽  
Reinforced Polymer ◽  
Fiber Reinforced Materials ◽  
Properties Of Materials ◽  
Composite Properties

The fiber reinforced materials, substrates, structural core materials, adhesives and auxiliary materials of wind turbine blade are discussed in this article. And the resin transfer molding (RTM) forming process, molding process and the latest Flex molding process are mainly summarized as well in the development of carbon fiber reinforced polymer (CFRP) application. Finally, the application and development of CFRP are analyzed in wind power field by combining research status of wind power both at home and abroad.

Surface Treatment of Quartz Fiber in SiO2/SiO2f with Composite Properties of Materials

2012 ◽  
Vol 600 ◽  
pp. 218-221 ◽  
Author(s):  
Juan Wang ◽  
Si Yu Lai ◽  
Da Li
Keyword(s):  
Heat Treatment ◽  
Organic Solvent ◽  
Surface Treatment ◽  
Loss Rate ◽  
Heating Process ◽  
Quartz Fiber ◽  
Heating Rates ◽  
Before And After ◽  
Properties Of Materials ◽  
Composite Properties

Two methods are adopted to remove wetting agents on surface of the quartz fiber, one is heat treatment, and the other is the combination of organic solvent and heat treatment. By comparing the changes of weight loss rate of quartz fiber before and after surface treatment, analyzing variation of morphology and composition of surface in SEM and XPS approaches, we conclude that the combination of organic solvent and heat treatment is superior to the pure thermal treatment in dealing with surface of quartz fiber. In heating process, different heating rates are used, the results show that: the lower the heating rate is, the greater the mechanical strength of the quartz fiber losses.

The Soleplate Materials and Performance of Table Tennis Bat with the Composite Properties of Materials in Material Engineering

2012 ◽  
Vol 583 ◽  
pp. 232-235
Author(s):  
Wei Min Sun ◽  
Shao Qing Zhang ◽  
Shi Ru Hao
Keyword(s):  
Composite Materials ◽  
Manufacturing Processes ◽  
Table Tennis ◽  
Functional Material ◽  
Material Engineering ◽  
Properties Of Materials ◽  
And Performance ◽  
The Relationship ◽  
Composite Properties

The study analyzed the relationship between the different composite materials, distributions of table tennis backplanes and the backplanes different performances. Although there’re so many brands which are with different price in the market of the table tennis equipment, the sportsmen could also find some principle through observing the functional material and manufacturing processes, and then understand the performance of the backplane; this study analyzed the relationship between the performance of table tennis bat and the composite properties of materials.

scholarly journals INVESTIGATION OF GLASS PLATE FAILURE MECHANISM SUBJECTED TO COPPER AND STEEL PROJECTILE IMPACTS

2014 ◽  
Vol 15 (1) ◽  
Author(s):  
Qasim H. Shah ◽  
Kyaw M. Aung
Keyword(s):  
Glass Plate ◽  
Element Analysis ◽  
Projectile Impact ◽  
Spider Web ◽  
Impact Location ◽  
Glass Model ◽  
Glass Target ◽  
Cracking Pattern ◽  
Radial Cracks ◽  
The Impact

ABSTRACT: A glass plate was subjected to impact by spherical copper and steel projectiles at low velocities. The glass failure features consisted of a central Hertzian cone made up of comminuted glass and a spider web like cracking pattern around the cone with circumferential and radial cracks. The objective of the investigation was to determine if the damage caused by copper projectile impact compared to steel projectile impact was higher for the same kinetic energy (K.E.) projectiles and the reason for this phenomenon. For the constant K.E. impact, copper projectile apparently caused higher damage in glass plate. Higher damage was attributed to projectile contact duration and the contact area between the projectile and the glass plate. Finite element analysis using LS-DYNA based upon maximum principal strain failure criterion for laminated glass model was able to predict the failed material under the impact location and the cracking pattern in the glass plate for a biased meshing scheme. Radial cracks in glass target were reported to be 15% higher for copper projectile impact than the steel projectile impact. ABSTRAK: Kepingan kaca dikenakan impak oleh projektil kuprum dan keluli berbentuk sfera pada halaju rendah. Ciri-ciri kegagalan kaca terdiri daripada kon berpusat Hertzian yang melibatkan kaca yang hancur dan corak pecahan berbentuk sesawang lelabah pada keliling kon dengan retakan lilitan dan jejarian. Tujuan penyelidikan adalah untuk menentukan sebab bagaimana  dengan projektil tenaga kinetik yang sama, kerosakan yang diakibatkan oleh impak projektil kuprum berbanding dengan impak projektil keluli adalah lebih tinggi. Untuk impak tenaga kinetik yang malar, projektil kuprum didapati menyebabkan kerosakan yang lebih ke atas kepingan kaca. Kerosakan lebih disebabkan oleh tempoh sentuhan projektil dan kawasan sentuhan di antara projektil dan kepingan kaca. Analisis unsur terhingga menggunakan LS-DYNA berdasarkan kriteria kegagalan terikan utama maksima untuk model kaca berlamina.  Kaedah ini berupaya menjangkakan kegagalan objek pada lokasi impak dan corak retakan pada kepingan kaca untuk skim berjejaring terpincang.  Retakan berjejari pada sasaran kaca didapati 15% lebih tinggi untuk impak projektil kuprum berbandingkan  dengan impak projektil keluli.

Crawling Pipeline of Pink-and-White Research and Design with Composite Properties of Materials

2012 ◽  
Vol 583 ◽  
pp. 240-243
Author(s):  
Hong Pu Liu ◽  
Er Bao Peng
Keyword(s):  
Type Structure ◽  
Pipe Diameter ◽  
Complex Type ◽  
The Common ◽  
Properties Of Materials ◽  
Research And Design ◽  
Composite Properties

This paper gives a pipeline crawling device with umbrella-type structure base on the research of the common creeping device pipeline. The machine can realize move in pipe diameter scope of 450-1100mm by comprehensive Composite Properties of Materials screw and umbrella -type adjustable support-arm. Through the Composite Properties of Materials of the electromechanical movement order, the creeping device can turn right or left, and smoothly through such a complex +-type and t-shaped pipeline.

Metallurgical Effects of Grain Boundary Ledges

1977 ◽  
Vol 35 ◽  
pp. 126-129
Author(s):  
L.E. Murr
Keyword(s):  
Grain Boundary ◽  
Quantitative Data ◽  
Mechanical Treatment ◽  
Unit Length ◽  
Physical And Mechanical Properties ◽  
Direct Observations ◽  
Transmission Electron ◽  
Properties Of Materials ◽  
Thermo Mechanical Treatment ◽  
Ledge Density

Ledges in grain boundaries can be identified by their characteristic contrast features (straight, black-white lines) distinct from those of lattice dislocations, for example1,2 [see Fig. 1(a) and (b)]. Simple contrast rules as pointed out by Murr and Venkatesh2, can be established so that ledges may be recognized with come confidence, and the number of ledges per unit length of grain boundary (referred to as the ledge density, m) measured by direct observations in the transmission electron microscope. Such measurements can then give rise to quantitative data which can be used to provide evidence for the influence of ledges on the physical and mechanical properties of materials.It has been shown that ledge density can be systematically altered in some metals by thermo-mechanical treatment3,4.

A Stable Field Emission Electron Source

1977 ◽  
Vol 35 ◽  
pp. 58-59
Author(s):  
W.R. Bottoms ◽  
G.B. Haydon
Keyword(s):  
Field Emission ◽  
Signal To Noise Ratio ◽  
High Brightness ◽  
Electron Sources ◽  
Brightness Field ◽  
Current Densities ◽  
Properties Of Materials ◽  
Stable Field ◽  
Stable Current ◽  
Careful Design

There is great interest in improving the brightness of electron sources and therefore the ability of electron optical instrumentation to probe the properties of materials. Extensive work by Dr. Crew and others has provided extremely high brightness sources for certain kinds of analytical problems but which pose serious difficulties in other problems. These sources cannot survive in conventional system vacuums. If one wishes to gather information from the other signal channels activated by electron beam bombardment it is necessary to provide sufficient current to allow an acceptable signal-to-noise ratio. It is possible through careful design to provide a high brightness field emission source which has the capability of providing high currents as well as high current densities to a specimen. In this paper we describe an electrode to provide long-lived stable current in field emission sources.The source geometry was based upon the results of extensive computer modeling. The design attempted to maximize the total current available at a specimen.

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