scholarly journals Investigation of Moisture Management and Air Permeability Properties of Fabrics with Linen and Linen-Polyester Blend Yarns

2018 ◽  
Vol 26 (4(130)) ◽  
pp. 39-47 ◽  
Author(s):  
Erhan Kenan Çeven ◽  
Gizem Karakan Günaydin
Keyword(s):  
Experimental Study ◽  
Absorption Rate ◽  
Structural Parameters ◽  
Air Permeability ◽  
Test Results ◽  
Warp Yarn ◽  
Significance Level ◽  
Moisture Management ◽  
Different Types ◽  
Wetting Time

This paper has focused on moisture management (MMT) and air permeability properties of fabrics produced from linen (100%) and linen-polyester yarns (80% polyester and 20% linen) at different weft densities. In the experimental study, eighteen different types of fabrics composed of six different weft yarns with three levels of weft density (weft density of 8,10 &12 pick/cm for 100% linen fabrics and 14,16,18 pick/cm for polyester-linen fabrics) were selected in order to determine the influence of weft density and yarn structural parameters (number of yarn folds) on moisture management as well as air permeability properties. The following weft yarns were selected: 104/1 tex, 104/2 tex & 104/3 tex for 100% linen and 41/1 tex, 41/2 tex & 41/3 tex for 80% Polyester – 20% linen fabrics, whereas the warp yarn was constant – 50/1 tex 100% linen for all fabric types. Satin type fabrics were subjected to moisture management tests and air permeability tests as well. According to test results, it was determined that some of the moisture management (wetting time, absorption rate (%/s) and one-way accumulative transport index of the fabrics’ top surfaces and bottom surfaces) and air permeability properties were significantly affected by the number of yarn folds and the weft density at a 0.05 significance level.

Experimental Study on Seismic Behavior of Strengthening Joints in Light Steel Adding Storey

2013 ◽  
Vol 671-674 ◽  
pp. 1480-1483
Author(s):  
Rong Guo ◽  
Shao Wei Zhao ◽  
Kun Liu
Keyword(s):  
Experimental Study ◽  
Energy Consumption ◽  
Seismic Behavior ◽  
Failure Modes ◽  
Stiffness Degradation ◽  
Test Results ◽  
Static Tests ◽  
Concrete Frame ◽  
Different Types ◽  
Strengthening Method

In order to acquire the seismic performance of three different types of nodes between the concrete frame and the light steel adding storey, the pseudo-static tests were carried out to analyse contrastively these specimens’ failure modes, stiffness degradation, hysteretic curves and energy dissipation. The test results showed that : Three nodes’ destruction were due to the plastic hinges emerging at the end of beam; both encased steel and carbon fiber strengthening method can improve the seismic behavior, and in terms of the ultimate bearing capacity, energy consumption ability，the encased steel strengthening one can improved more significantly, and the encased steel one can effectively slow down the speed of stiffness degradation.

scholarly journals Investigation of the comfort properties of traditional woven fabrics with different structural parameters

2020 ◽  
Vol 71 (04) ◽  
pp. 302-308
Author(s):  
MINE AKGUN ◽  
GIZEM KARAKAN GUNAYDIN ◽  
AYÇA GÜRARDA ◽  
ERHAN KENAN ÇEVEN
Keyword(s):  
Thermal Resistance ◽  
Water Vapour ◽  
Structural Parameters ◽  
Air Permeability ◽  
Woven Fabrics ◽  
Water Vapour Permeability ◽  
Test Results ◽  
Vapour Permeability ◽  
Thermal Absorptivity

Turkish traditional Buldan weavings are known as special fabrics in terms of providing comfortable clothes which are known to be natural and healthy in Denizli, Turkey. The research presented in this paper assesses the effects of different fabric structural parameters of Buldan fabrics on comfort properties such as thermal resistance, thermal absorptivity, water vapour permeability and air permeability. Five different Buldan fabrics woven with different fabric structural parameters were produced. According to test results, cotton/Tencel Buldan fabrics indicated similar comfort properties with the 100% cotton Buldan fabric properties. Additionally, the lowest thermal absorptivity was observed from 100% cotton Buldan fabrics which give the warmth feeling among the evaluated samples.

Penerapan Teknik Rainforcement Positif Untuk Meningkatkan Kedisiplinan Belajar Siswa

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Hasbahuddin Hasbahuddin
Keyword(s):  
Experimental Study ◽  
Data Collection ◽  
Student Learning ◽  
Research Design ◽  
Design Research ◽  
Student Discipline ◽  
Test Results ◽  
Significance Level ◽  
Before And After

Research that examines the picture of student discipline before and after the application of positif reinforcement techniques and the effect of the application of positif reinforcement techniques to increase student discipline in SMA Negeri 20 Pangkep. This study aims to determine the level of student discipline as well as determine the effect of positif reinforcement techniques on increasing student discipline in SMA Negeri 20 Pangkep. Data collection techniques in this study used a questionnaire with a sample of 35 students from all grade X students with a population of 162 students in SMA Negeri 20 Pangkep. This type of research used in this study is an experimental study with one group pretest-posttest village design research design. The results showed that there was a difference between the test results before and after being given a positif reinforcement technique treatment of 0.660 at a significance of 0.879> 0.05. While the value of t arithmetic is smaller than t table (21,707 <1,697) at a significance level of 5%, it means that there is an influence on the application of the Positif Reinforcement technique to the discipline of student learning in SMA Negeri 20 Pangkep

Experimental Study on Preparing Ecological Building Mortar by Using Solid Waste

2013 ◽  
Vol 763 ◽  
pp. 199-202
Author(s):  
Chao Yong Yan ◽  
Zhi Hua Li ◽  
Xiao Min Deng
Keyword(s):  
Adverse Effect ◽  
Experimental Study ◽  
Compressive Strength ◽  
Water Consumption ◽  
Cementitious Materials ◽  
Test Results ◽  
Natural Sand ◽  
Brick Powder ◽  
Different Types ◽  
Ecological Building

This paper presents a kind of ecological building mortar with a compressive strength of M5.0, M7.5 and M10 , which includes waste residue as cementitious materials, and waste brick powder, waste mortar powder reclaimed sand instead of natural sand as aggregate. The test results shows that (1) mortar water consumption increase when recycled sand volume increases, but its water-retaining capacity goes up;(2) when different types of recycled sand are used instead of natural sand for middle and low strength mortar, there is no significant adverse effect on its strength, and the 28d compressive strength can all meet the designed strength requirements; (3) Little difference exists among the influence of different recycled sand on properties of mortar.

scholarly journals Experimental Study on Lining Cracking of Shallow Buried Loess Tunnel under the Simulation of Effect of Slide Surface Immersion

2020 ◽  
Vol 10 (17) ◽  
pp. 6080 ◽  
Author(s):  
Yuyang Liu ◽  
Hongpeng Lai
Keyword(s):  
Experimental Study ◽  
Water Immersion ◽  
Surrounding Rock ◽  
Test Results ◽  
Rock Slide ◽  
Geometric Similarity ◽  
Slide Surface ◽  
Different Types ◽  
Similarity Ratio ◽  
Secondary Lining

The water immersion of surrounding rock slide surface causes lining cracking of the shallow buried loess tunnel, and different types of slide surface and different immersion degrees have different effects on secondary lining. In this paper, four types of slide surfaces for shallow buried loess tunnel are proposed. In order to find out the characteristics and laws of lining cracking under the effect of slide surface immersion, a loading model test with a large geometric similarity ratio of 1:10 was carried out. The test results show that the immersion of the slide surface has the most significant influence on the deformation of the lining vault and the arch waist, and the value and speed of the vault deformation are always the largest. When the unilateral slide surface is immersed in water, the lining cracking is concentrated on the flooded side of the slide surface, and the appearance of compressive cracks can be regarded as a precursor of lining instability. In the direction of lining thickness, the cracks always begin to develop from I-type, then gradually develop into L-type, and finally develop to Y-type, among which the number of L-type cracks is the most. Furthermore, the residual bearing capacity of cracked lining is also discussed.

scholarly journals Structure and breathability of silk/cashmere interwoven fabrics based on fractal theory

2020 ◽  
Vol 15 ◽  
pp. 155892502097930
Author(s):  
Ying Chen ◽  
Lifan Mei ◽  
Qiuyu Li
Keyword(s):  
Fractal Dimension ◽  
Structural Parameters ◽  
Fractal Theory ◽  
Air Permeability ◽  
Water Soluble ◽  
Weft Yarn ◽  
Warp Yarn ◽  
Moisture Permeability ◽  
And Performance ◽  
The Relationship

The fractal weave has a different appearance from the traditional weaves, and the fabric performances such as air and moisture comfort have not been studied. The relationship between the fabric structure and performance of the fractal weaves is not yet clear. In this paper, the corresponding fractal weaves were generated based on the fractal theory, and the corresponding fabrics were woven using raw silk as the warp yarn and cashmere/water-soluble vinylon as the weft yarn. The structural parameters, air permeability and moisture permeability were tested. The results show that fabric moisture permeability are not closely related with the three weave parameters of fractal dimension, average float length and weave coefficient. Its conduction mechanism is different from air permeability. The average floating length, fractal dimension, and its parameter combinations have a good fitting relationship with air permeability, and the polynomial fitting R2 can reach to 0.99938. The fitting formula 8 has guiding significance for the design of fabrics with certain air permeability requirements.

scholarly journals Comparison of Moisture Management Properties of Plasma Treated Single Jersey Fabric with Different Types of Polyester Yarns

2019 ◽  
Vol 27 (1(133)) ◽  
pp. 32-36
Author(s):  
Vidya Thangavelu ◽  
Prakash Chidambaram
Keyword(s):  
Absorption Rate ◽  
Polyester Fabric ◽  
Spreading Speed ◽  
Moisture Management ◽  
Management Capacity ◽  
Different Types ◽  
Rate Maximum ◽  
Continuous Filament ◽  
Overall Performance ◽  
Single Jersey

In this study, the moisture management properties of plasma treated single jersey knitted fabric with different types of polyester yarns: spun polyester, continuous filament yarn and micro denier yarn with different linear densities were analysed and investigated. The moisture management properties of the same were measured using a moisture management tester. The results of the treated and untreated single jersey fabric were tested for their wetting time, absorption rate, maximum wetted radii, spreading speed, and overall moisture management capacity . It was observed that for the plasma treated fabrics, the time taken for wetting and the absorption rate of spun polyester are faster. Continuous filament polyester shows the maximum wetted radii, and the spreading speed and overall moisture management capacity (OMMC) of spun polyester significantly increases when compared with untreated fabrics. The plasma treatment significantly improved the overall performance of polyester fabric.

scholarly journals A New Fibre Composite Beam for Civil Engineering Applications

1999 ◽  
Vol 8 (5) ◽  
pp. 096369359900800
Author(s):  
Gerard M. Van Erp
Keyword(s):  
Experimental Study ◽  
Composite Beam ◽  
Civil Engineering ◽  
Concrete Beams ◽  
Fibre Composite ◽  
Test Results ◽  
Structural Behaviour ◽  
Resin Core ◽  
Different Types ◽  
Very High

This paper presents preliminary findings of an experimental study into the structural behaviour of a new composite beam designed specifically for the civil engineering market. The Filled Resin Core (FRC) beam eliminates most problems associated with standard pultruded beams and is capable of carrying very high loads at a cost similar to steel and concrete beams. Principles of the new design are discussed and test results for three different types of beams are presented.

Internal stresses in glulam due to moisture gradients in the grain direction

Holzforschung ◽  
2005 ◽  
Vol 59 (1) ◽  
pp. 18-22 ◽  
Author(s):  
Johan Hans Jönsson
Keyword(s):  
Climate Change ◽  
Experimental Study ◽  
Stress State ◽  
Modulus Of Elasticity ◽  
Internal Stresses ◽  
Test Results ◽  
Tensile Stresses ◽  
Glued Laminated Timber ◽  
Average Maximum ◽  
Different Types

Abstract An experimental study on the internal stress state perpendicular to grain in glued laminated timber induced by moisture variations along the grain is presented. The stress is evaluated by using measured modulus of elasticity and strain. Different types of tests are performed, in which specimens are exposed to artificial climate change when the specimens are in either a wetting or a drying state, and specimens are exposed to a cyclic climate change. Test results from the specimens that were in a drying state show that the tensile stresses near the end of the specimens at some point exceeds the strength of the wood and cracks. In the opposite test, when the specimens are in a moistening phase, the maximum tensile stresses are lower and in the order of 0.2 MPa during the tested period. The cyclic test, which continued during 20 weeks, showed that there were no accumulated effects regarding strain and stress values. In this test, the average maximum tensile and compression stresses were of the order 0.20 and 0.10 MPa, respectively.

Structural investigation of spunlace nonwoven

2018 ◽  
Vol 22 (3) ◽  
pp. 158-179 ◽  
Author(s):  
Ravi Kumar Jain ◽  
Sujit Kumar Sinha ◽  
Apurba Das
Keyword(s):  
High Speed ◽  
Structural Changes ◽  
Structural Integrity ◽  
Pore Diameter ◽  
Structural Parameters ◽  
Water Pressure ◽  
Air Permeability ◽  
Strong Positive Correlation ◽  
Content Type ◽  
Significance Level

Purpose Spunlacing is a promising nonwoven technology for the production of fabric with good handle and better structural integrity. Structural parameters such as pore size, thickness and number of binding point/entanglement between fibres are decisive for good mechanical and comfort properties of nonwoven fabrics. This study aims to focus on the effect of different process parameters on the structural change in spunlace fabrics. Design/methodology/approach Spunlacing is purely a mechanical bonding technology where high-speed jets of water strike a web to entangle the fibres. Different spunlace nonwoven structures were produced by varying processing parameters such as waterjet pressure, delivery speed, web mass and web composition as per four-factor, three-level Box–Behnken design. The effect of these parameters on the structural arrangement was studied using scanning electron microscopy. An attempt has also been made to study the changes in pore geometry and thickness of the fabrics by using response surface methodology with backward elimination. Findings Significant structural changes were observed with variation in water pressure, web mass and web composition. The test results showed that fabric produced at higher waterjet pressure has lower mean pore diameter and lower thickness. The variation in mean pore diameter and mean thickness due to waterjet pressure is around 26 and 34 per cent, respectively, at 95 per cent significance level. The web composition and web mass also significantly influence the mean pore diameter and thickness at 95 per cent significance level. There is a strong positive correlation (r = 0.523) between mean air permeability and mean pore diameter of fabric, and this correlation is significantly linear. A strong negative correlation (r = −0.627) is found between weight and air permeability of fabric. Research limitations/implications The delivery speed failed to show any significant effect; this is in contrary to the general expectation. Originality/value The effect of concurrent variation in waterjet pressure, web mass, delivery speed and web composition on the structure of spunlace nonwoven is studied, which was not reported in the literature. The effect of web composition on pore diameter of spunlace nonwoven is interesting finding. This study is expected to help in designing the spunlace nonwoven as per end uses and specifically for apparel application.

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