scholarly journals A primary study on tensile strength stability of Mg-5Y-3Sm-0.5Sb alloy

2017 ◽  
Keyword(s):  
Tensile Strength ◽  
Primary Study

The Primary Study on PET/PP/Kevlar Composite Nonwoven

2012 ◽  
Vol 554-556 ◽  
pp. 315-318
Author(s):  
Chen Hung Huang ◽  
Ting Ting Li ◽  
Yu Chun Chuang ◽  
Ching Wen Lou ◽  
An Li Huang ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Environmental Protection ◽  
Hot Pressing ◽  
Primary Study ◽  
Composite Nonwoven ◽  
Tearing Strength

For purpose of recycle and environmental protection, recycled Kevlar selvages and spunlace PP selvages, blended with low-melting polyester, were used to prepare composite nonwovens. In addition, the effect of hot-pressing and lay-up orientation on tensile strength and tearing strength was evaluated. The result shows that, after hot-pressing, laying respectively 0°/90°and -45°/45°PP selvages, tensile strength and tearing strength of composite nonwovens exhibits the highest, reaching 1000 N and 1370.2 N separately.

The Primary Study on PET/Spandex Tubular Braid

2012 ◽  
Vol 554-556 ◽  
pp. 214-217
Author(s):  
Ching Wen Lou ◽  
Jin Jia Hu ◽  
Wen Cheng Chen ◽  
Ching Wen Lin ◽  
Zong Han Wu ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Bypass Surgery ◽  
Small Diameter ◽  
Vascular Diseases ◽  
Primary Study ◽  
Varying Thickness ◽  
Hybrid Yarn ◽  
Strength Tests ◽  
The World ◽  
Manufacturing Methods

Cardiovascular disease is one of important problems that the world countries face to. Especially for atherosclerosis and its concerned vascular diseases, they needs to be cured via bypass surgery. Consequently, developing small-diameter vascular grafts becomes important. This study aims to fabricate the tubular braid, and then evaluate its manufacturing methods and properties. In this paper, PET/Spandex hybrid yarn was braided into the tubular braid by braider. By repeated braiding, the layers of the tubular braid increases, producing multi-group tubular braids with varying thickness. After by the thickness and tensile strength tests, the physical properties of braids were estimated. The result demonstrates that, as increase of layers, the tensile strength also increases.

The Primary Study on Polyester/ Polypropylene Sound-Absorption Nonwoven Fabric

2012 ◽  
Vol 554-556 ◽  
pp. 136-139 ◽  
Author(s):  
Chen Hung Huang ◽  
Ting Ting Li ◽  
Yu Chun Chuang ◽  
Ching Wen Lou ◽  
Jin Mao Chen ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Absorption Coefficient ◽  
Sound Absorption ◽  
Nonwoven Fabric ◽  
Low Noise ◽  
Primary Study ◽  
Maximum Tensile Strength ◽  
Nonwoven Fabrics ◽  
Tearing Strength

As social civilization advances, more and more people reside in the city. Consequently, the number of automobiles and locomotives increases, causing greenhouse effect and noise pollution increasingly serious. Therefore, lowering the temperature and reducing the noise in living conditions has become an urgent task, in order to save resources usage amount and to produce a low-noise dwelling environment. In this study, the sound-absorption and heat-insulation nonwoven fabrics were firstly prepared by three-dimensional crimp hollow polyester fiber (PET) fibers and Polypropylene (PP) fibers based on nonwoven processing technology, following by sound-absorption coefficient test, thermal conductivity test, as well as maximum tensile strength and maximum tearing strength tests. The results show that, 70/30 wt% PET/ PP nonwoven fabrics have the maximum tensile strength of 2.47 MPa (CD) and 1.67 MPa (MD), in addition with the maximum tearing strength of 83.96 kN/m (CD), 111.88 kN/m (MD); the 90/10 wt% PET/ PP nonwoven presents the lowest thermal conductivity coefficient of 0.0365 W/K‧m; nonwoven with three different ratios show the similar sound-absorbing curves, which all reaches the highest absorption coefficient of 0.76 at 4000 Hz.

The Primary Study on PLA/Tencel Nonwoevn Fabric

2012 ◽  
Vol 184-185 ◽  
pp. 1333-1336 ◽  
Author(s):  
Ching Wen Lou ◽  
Chao Tsang Lu ◽  
Yueh Sheng Chen ◽  
Meng Chen Lin ◽  
Ting Ting Li ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Tensile Strength ◽  
Polylactic Acid ◽  
Wound Dressing ◽  
Sandwich Structure ◽  
Nonwoven Fabric ◽  
Primary Study ◽  
Nonwoven Fabrics ◽  
Composite Nonwoven ◽  
Tearing Strength

Polylactic acid (PLA) is often applicable in biomedical because in environment it degrades into carbon dioxide and water. This study aims to prepare sandwich-structure PLA/ Tencel composite nonwoven, following by its property test for evaluating effect on wound dressing. In this study, PLA fibers, blended with Tencel fibers, were made into nonwoven fabrics based on nonwoven processing technology. After that, their tensile strength, tearing strength and softness were tested for evaluating nonwoven fabric properties. The result displays that, PLA nonwoven fabrics show higher tensile strength and tearing strength than Tencel nonwoven fabrics.

The Primary Study on PP/Sawdust/PU Sound-Absorbing Plank

2012 ◽  
Vol 557-559 ◽  
pp. 1045-1048 ◽  
Author(s):  
Chen Hung Huang ◽  
Ting Ting Li ◽  
Yu Chun Chuang ◽  
Ching Wen Lou ◽  
Ching Wen Lin ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Tensile Strength ◽  
Absorption Coefficient ◽  
Sandwich Structure ◽  
Sound Absorption ◽  
Primary Study ◽  
Multiple Functions ◽  
Optimal Ratio ◽  
Recycled Polypropylene ◽  
Absorbing Property

By recycling method, the wastes in the nonwoven industry decreases, and simultaneously multiple functions are attached to the nonwoven, leading to varied application of nonwoven. With these purpose, different ratios of recycled sawdust was blended in PU foaming body material, and the optimal ratio was chosen based on the best sound-absorbing property. Additionally, recycled polypropylene (PP) fiber and PP fiber were needle-punched to form PP nonwoven foundation. Ratios of the PP recycled selvages were varying in this process. Afterwards, tensile strength and sound absorption coefficient of nonwoven foundations were both evaluated for optimal nonwoven parameters. Finally, the optimal Sawdust/ PU foaming and PP nonwoven foundation were laminated into a sandwich-structure composite—PP/Sawdust/PU sound-absorbing plank, following characterizations of sound-absorbing property and mechanical property.

Phase Transformations in Ti-7w/oMo-3w/oMe Alloy

1974 ◽  
Vol 32 ◽  
pp. 514-515
Author(s):  
S. Fujishiro
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Transmission Electron Microscopy ◽  
Tensile Strength ◽  
Mechanical Processing ◽  
Ray Method ◽  
X Ray ◽  
Transmission Electron ◽  
Water Quench ◽  
Alpha Beta

The mechanical properties of three titanium alloys (Ti-7Mo-3Al, Ti-7Mo- 3Cu and Ti-7Mo-3Ta) were evaluated as function of: 1) Solutionizing in the beta field and aging, 2) Thermal Mechanical Processing in the beta field and aging, 3) Solutionizing in the alpha + beta field and aging. The samples were isothermally aged in the temperature range 300° to 700*C for 4 to 24 hours, followed by a water quench. Transmission electron microscopy and X-ray method were used to identify the phase formed. All three alloys solutionized at 1050°C (beta field) transformed to martensitic alpha (alpha prime) upon being water quenched. Despite this heavily strained alpha prime, which is characterized by microtwins the tensile strength of the as-quenched alloys is relatively low and the elongation is as high as 30%.

A TEM microscopical investigation of the magnetic domain structure of a metastable austenitic stainless steel

1994 ◽  
Vol 52 ◽  
pp. 696-697
Author(s):  
G. Fourlaris ◽  
T. Gladman
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Cold Rolling ◽  
Solution Treatment ◽  
Magnetic Domain ◽  
High Strength ◽  
Medium Carbon Steel ◽  
Magnetic Characteristics ◽  
Metastable Austenitic Stainless Steel

Stainless steels have widespread applications due to their good corrosion resistance, but for certain types of large naval constructions, other requirements are imposed such as high strength and toughness , and modified magnetic characteristics.The magnetic characteristics of a 302 type metastable austenitic stainless steel has been assessed after various cold rolling treatments designed to increase strength by strain inducement of martensite. A grade 817M40 low alloy medium carbon steel was used as a reference material.The metastable austenitic stainless steel after solution treatment possesses a fully austenitic microstructure. However its tensile strength , in the solution treated condition , is low.Cold rolling results in the strain induced transformation to α’- martensite in austenitic matrix and enhances the tensile strength. However , α’-martensite is ferromagnetic , and its introduction to an otherwise fully paramagnetic matrix alters the magnetic response of the material. An example of the mixed martensitic-retained austenitic microstructure obtained after the cold rolling experiment is provided in the SEM micrograph of Figure 1.

Morphology of High-Performance Rigid-Rod Polymer Fibers and Molecular Composites

1989 ◽  
Vol 47 ◽  
pp. 338-339
Author(s):  
W.W. Adams ◽  
S. J. Krause
Keyword(s):  
Tensile Strength ◽  
High Performance ◽  
Liquid Crystalline ◽  
Molecular Level ◽  
Synergistic Effects ◽  
Tensile Modulus ◽  
Commercial Development ◽  
The Matrix ◽  
Molecular Composites ◽  
Rigid Rod

Rigid-rod polymers such as PBO, poly(paraphenylene benzobisoxazole), Figure 1a, are now in commercial development for use as high-performance fibers and for reinforcement at the molecular level in molecular composites. Spinning of liquid crystalline polyphosphoric acid solutions of PBO, followed by washing, drying, and tension heat treatment produces fibers which have the following properties: density of 1.59 g/cm3; tensile strength of 820 kpsi; tensile modulus of 52 Mpsi; compressive strength of 50 kpsi; they are electrically insulating; they do not absorb moisture; and they are insensitive to radiation, including ultraviolet. Since the chain modulus of PBO is estimated to be 730 GPa, the high stiffness also affords the opportunity to reinforce a flexible coil polymer at the molecular level, in analogy to a chopped fiber reinforced composite. The objectives of the molecular composite concept are to eliminate the thermal expansion coefficient mismatch between the fiber and the matrix, as occurs in conventional composites, to eliminate the interface between the fiber and the matrix, and, hopefully, to obtain synergistic effects from the exceptional stiffness of the rigid-rod molecule. These expectations have been confirmed in the case of blending rigid-rod PBZT, poly(paraphenylene benzobisthiazole), Figure 1b, with stiff-chain ABPBI, poly 2,5(6) benzimidazole, Fig. 1c A film with 30% PBZT/70% ABPBI had tensile strength 190 kpsi and tensile modulus of 13 Mpsi when solution spun from a 3% methane sulfonic acid solution into a film. The modulus, as predicted by rule of mixtures, for a film with this composition and with planar isotropic orientation, should be 16 Mpsi. The experimental value is 80% of the theoretical value indicating that the concept of a molecular composite is valid.

Variasi Penambahan Sika Cim Dan Fiber Kawat Pada Beton Mutu Fc’ 30 Mpa

2018 ◽  
Vol 9 (2) ◽  
pp. 67-73
Author(s):  
M Zainul Arifin
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Curing Temperature ◽  
Test Results ◽  
Concrete Compressive Strength ◽  
Normal Concrete ◽  
Astm Method ◽  
Additive Type ◽  
Composition Variation ◽  
Compressive Strength Of Concrete

This research was conducted to determine the value of the highest compressive strength from the ratio of normal concrete to normal concrete plus additive types of Sika Cim with a composition variation of 0.25%, 0.50%, 0.75%, 1.00%, 1.25%, 1 , 50% and 1.75% of the weight of cement besides that in this study also aims to find the highest tensile strength from the ratio of normal concrete to normal concrete in the mixture of sika cim composition at the highest compressive strength above and after that added fiber wire with a size diameter of 1 mm in length 100 mm with a ratio of 1% of material weight. The concrete mix plan was calculated using the ASTM method, the matrial composition of the normal concrete mixture as follows, 314 kg / m3 cement, 789 kg / m3 sand, 1125 kg / m3 gravel and 189 liters / m3 of water at 10 cm slump, then normal concrete added variations of the composition of sika cim 0.25%, 0.50%, 0.75%, 1.00%, 1.25%, 1.5%, 1.75% by weight of cement and fiber, the tests carried out were compressive strength of concrete and tensile strength of concrete, normal maintenance is soaked in fresh water for 28 days at 30oC. From the test results it was found that the normal concrete compressive strength at the age of 28 days was fc1 30 Mpa, the variation in the addition of the sika cim additive type mineral was achieved in composition 0.75% of the cement weight of fc1 40.2 Mpa 30C. Besides that the tensile strength test results were 28 days old with the addition of 1% fiber wire mineral to the weight of the material at a curing temperature of 30oC of 7.5%.

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