scholarly journals Mechanical properties of potato starch modified by moisture content and addition of lubricant

2014 ◽  
Vol 28 (4) ◽  
pp. 501-509 ◽  
Author(s):  
Mateusz Stasiak ◽  
Marek Molenda ◽  
Józef Horabik ◽  
Peter Mueller ◽  
Ireneusz Opaliński
Keyword(s):  
Mechanical Properties ◽  
Internal Friction ◽  
Moisture Content ◽  
Bulk Density ◽  
Modulus Of Elasticity ◽  
Potato Starch ◽  
Magnesium Stearate ◽  
Wall Friction ◽  
Considerable Influence ◽  
Angle Of Internal Friction

Abstract Laboratory testing was conducted to deliver a set of characteristics of structure and mechanical properties of pure starch and starch with an addition of a lubricant - magnesium stearate. Considerable influence of moisture content of potato starch was found in the case of density, parameters of internal friction, coefficients of wall friction and flowability. Elasticity was found to be strongly influenced by water content of the material. Addition of magnesium stearate affected density and parameters of flowability, internal friction and elasticity. Bulk density increased from 604 to 774 kg m-3 with decrease in moisture content of potato starch from 17 to for 6%. Addition of magnesium stearate resulted in approximately 10% decrease in bulk density. Angle of internal friction obtained for 10 kPa of consolidation stress decreased from 33 to 24º with increase in moisture content, and to approximately 22º with addition of the lubricant. With an increase of moisture content from 6 to 18% and with addition of the lubricant, the modulus of elasticity during loading decreased from approximately 1.0 to 0.1 MPa. Modulus of elasticity during unloading was found in the range from 19 to 42 MPa and increased with increase of moisture content and amount of lubricant.

scholarly journals A Comparative Analysis of the Flow Properties between Two Alumina-Based Dry Powders

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Milene Minniti de Campos ◽  
Maria do Carmo Ferreira
Keyword(s):  
Internal Friction ◽  
Moisture Content ◽  
Ceramic Powder ◽  
Morphological Characteristics ◽  
Angle Of Repose ◽  
Wall Friction ◽  
Flow Index ◽  
Alumina Powder ◽  
Flow Properties ◽  
Angle Of Internal Friction

We measured and compared the flow properties of two alumina-based powders. The alumina powder (AP) is irregularly shaped and has a smooth surface and moisture content of 0.16% (d.b.), and the ceramic powder (CP), obtained after atomization in a spray dryer, is spherical and has a rough surface and moisture content of 1.07%. We measured the Hausner ratio (HR), the static angle of repose (AoR), the flow index (FI), the angle of internal friction, and the wall's friction angle. The properties measured using aerated techniques (AoR and HR) demonstrated that AP presents true cohesiveness (and therefore a difficult flow), while CP presents some cohesiveness and its flow might be classified as half way between difficult and easy flow. Their FI values, which were obtained using a nonaerated technique, enable us to classify the alumina as cohesive and the ceramic powder as an easy-flow powder. The large mean diameter and morphological characteristics of CP reduce interparticle forces and improve flowability, in spite of the higher moisture content of their granules. The angles of internal friction and of wall friction were not significantly different when comparing the two powders.

Physical Properties of Whole Rye Seed (Secale cereal)

2012 ◽  
Vol 8 (4) ◽  
Author(s):  
Mohammad Jouki ◽  
Zahra Emam-Djomeh ◽  
Naimeh Khazaei
Keyword(s):  
Internal Friction ◽  
Moisture Content ◽  
Physical Properties ◽  
Bulk Density ◽  
Coefficient Of Friction ◽  
Average Length ◽  
Angle Of Internal Friction ◽  
Length Width ◽  
Static Coefficient Of Friction ◽  
Static Coefficient

Abstract Certain physical properties of rye – density, true density, angle of internal friction, porosity and static coefficient of friction – are necessary for the design of transport, storage and processing equipment. . These properties were evaluated as a function of moisture content of grain. The grain was tested for bulk density, density, porosity, angle of internal friction and coefficient of friction with various materials at 9% and 13% moisture content (dry basis, db). The average length, width and thickness of the rye grains were 7.11mm, 4.65mm and 3.18mm. It was observed that bulk density decreased linearly from 598.41 to 580.76 kg/m3, as moisture content increased, while density increased linearly from 922.43 to 991.56 kg/m3. The porosity and angle of internal friction increased as moisture increased. The porosity increased linearly from 37.00% to 40.50%, and the angle of internal friction increased from 21.500 to 25.000. The static coefficient of friction increased from 0.283 to 0.412, 0.345 to 0.438, and 0.380 to 0.461 for glass, galvanized iron and wood surfaces respectively.

Influence of Moisture Content in some Mechanical Properties of Two Brazilian Tropical Wood Species

2014 ◽  
Vol 1025-1026 ◽  
pp. 42-45 ◽  
Author(s):  
Luiz A. Melgaço N. Branco ◽  
Eduardo Chahud ◽  
André Luis Christoforo ◽  
Francisco Antonio Rocco Lahr ◽  
Rosane A.G. Battistelle ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Moisture Content ◽  
Analysis Of Variance ◽  
Wood Species ◽  
Modulus Of Elasticity ◽  
Modulus Of Rupture ◽  
Tropical Wood ◽  
Fiber Saturation ◽  
Brazilian Standard

This study aimed, with the aid of analysis of variance (ANOVA), to investigate and quantify the influence of moisture ranging between 12% and over 30% (fiber saturation) on the mechanical properties: strength and modulus of elasticity in compression and in tension parallel to grain; modulus of rupture and modulus of elasticity in static bending; shear strength parallel to grain considering wood species Ipê (Tabebuia sp) and Angelim Araroba (Vataireopsis araroba). Tests were performed according to the assumptions and calculating methods Brazilian standard ABNT NBR 7190, Anexx B, totalizing 400 tests. Results of ANOVA revealed a significant reduction (16% on average) for mechanical properties wood due to the increase in moisture content from 12% to over 30% (fiber saturation). The same behavior also occurred when assembly containing the two species was considered.

scholarly journals Effect of Moisture Content on Selected Physical and Mechanical Properties of Two Varieties of Tigernut (Cyperus spp)

2013 ◽  
Vol 2 (6) ◽  
pp. 24
Author(s):  
A. S. Oyerinde ◽  
A. P. Olalusi
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Bulk Density ◽  
Average Length ◽  
Physical And Mechanical Properties ◽  
Static Friction ◽  
Angle Of Repose ◽  
Tuber Weight ◽  
Porosity Coefficient ◽  
Effect Of Moisture

<p>The effect of moisture content on some physical and mechanical properties of two varieties of tigernuts (<em>Cyperus esculentus</em>) was investigated. These properties include: geometric dimensions, linear dimensions, 1000 tuber weight, bulk density, tuber size, sphericity, angle of repose, porosity, coefficient of static friction and compressive strength. The moisture content levels used were 20, 25, 30, 35 and 40% wet basis (wb), and the two tigernut varieties used were yellow and brown types. The linear dimension, geometric diameter, sphericity, 1000- tuber weight, bulk density and angle of repose in both varieties increased with increasing moisture content. The average length, width and thickness of the yellow variety increases more than the brown variety at the determined moisture contents. True density of the yellow variety increased while the brown variety decreased with increase in moisture content. The porosity of the yellow variety reduces with increase in moisture content from 45.95 at 20% mc to 42.4 at 40% mc, while the brown variety decreased from 42.72 at 20% mc to 30.77 at 40% moisture content. The yellow variety had bigger size tubers than the brown variety and this has serious implications in packing, handling and transportation issues.</p>

scholarly journals The effect of mat layers moisture content on some properties of particleboard

2019 ◽  
Vol 70 (3) ◽  
pp. 221-228
Author(s):  
Abdullah Istek ◽  
Ismail Ozlusoylu
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Modulus Of Elasticity ◽  
Bending Strength ◽  
Physical And Mechanical Properties ◽  
Core Layer ◽  
Formaldehyde Resin ◽  
Internal Bonding ◽  
The Core ◽  
Internal Bonding Strength

In this study, the effect of mat moisture content on the physical and mechanical properties of particleboard was investigated. The experimental boards were produced by using 40 % softwood, 45 % hardwood chips, and 15 % sawdust. The formaldehyde resin/adhesive was used in three-layers (bottom-top layer 12 %, core layer 8 %). Multi-opening press was used during manufacturing the experimental particleboards. The physical and mechanical properties of boards obtained were identified according to the TS-EN standards. The optimum core layer moisture content was determined as 6 % and 7 % according to the results, whereas the moisture content of bottom and top layers was 14 %. Under these moisture content conditions, the bending strength was found to be 13.3 N/mm², the modulus of elasticity in bending 2466 N/mm², and internal bonding strength 0.44 N/mm². The optimum bottom-top layer moisture content was determined to be between 13 % and 15 % and 6.5 % for the core layer.

Effect of Glass Fiber on Shear Strength of Soil

2018 ◽  
Vol 775 ◽  
pp. 603-609
Author(s):  
Himadri Shekhar Saha ◽  
Debjit Bhowmik
Keyword(s):  
Shear Strength ◽  
Internal Friction ◽  
Moisture Content ◽  
Glass Fiber ◽  
Water Content ◽  
Soil Samples ◽  
Fiber Content ◽  
Triaxial Tests ◽  
Angle Of Internal Friction ◽  
Increase With Increase

This paper investigates the effect of glass fiber reinforcement on the shear strength properties of the sand clay mixture. The soil samples were prepared by mixing 50% of locally available Barak river sand with 50% of local clay soil. Triaxial tests were conducted on the soil samples containing five different percentage of fiber to know the effect of fiber content on the shear strength of the soil. Unconsolidated Undrained (UU) Triaxial tests were conducted under three different confining pressures for each sample. Samples were prepared with five different values of moisture content considering 2% less than OMC (Optimum Moisture Content), 1% less than OMC, OMC, 1% more than OMC, and 2% more than OMC to study the effect of water content (w) on behavior of fiber reinforced soil. A parametric study has been carried out in this paper to know the effect of different influencing parameters on the cohesion value and angle of internal friction. The results show that the failure stress and angle of internal friction increase with increase in fiber content up to an optimum value then decrease. On the other hand, the cohesion value increases consistently with increase in fiber content. The study also indicates that the peak deviator stress, angle of internal friction and cohesion values increase with increase in water content up to an optimum value which is less than OMC then decrease with further increase in water content.

Characterisation of Titanium Powder Flow, Shear and Bulk Properties Using the FT4 Powder Rheometer

2014 ◽  
Vol 1019 ◽  
pp. 218-224 ◽  
Author(s):  
Silethelwe Chikosha ◽  
Linda M. Mahlatji ◽  
Hilda K. Chikwanda
Keyword(s):  
Particle Size ◽  
Internal Friction ◽  
Fine Powder ◽  
Friction Angle ◽  
Wall Friction ◽  
Flow Shear ◽  
Coarse Powder ◽  
Bulk Properties ◽  
Angle Of Internal Friction ◽  
Powder Rheometer

In order to reliably design and operate different powder processes, an understanding of the dynamic flow, shear and bulk properties of powders is required. Generally, powders are evaluated by several techniques that determine their flow, shear and bulk properties. The techniques can include compression tests, shear tests, angle of repose, flow of powder in a funnel, tapped density and many others. In order to minimize the number of instruments required to characterise the powder and eliminate operator error, automated powder rheometers that can do most of the required tests have been developed. The FT4 powder rheometer is one of these and has found widespread use in the pharmaceutical industry. In this study, the FT4 powder rheometer was used to characterise two metallic titanium powders with different particle sizes, namely CSIR Ti-45μm (Fine Powder) and CSIR Ti +45-180μm (Coarse Powder). Their particle size, particle size distribution, bulk densities, compressibility, cohesion, flowability index, effective angle of internal friction and wall friction angle were determined. Preliminary results of the study indicated that fine powder had a lower bulk density, was more compressible and more cohesive than the coarse powder. The fine powder had a lower flowability index compared to the coarse powder for both the Jenike and Peschl classification. The varying degrees of cohesion of these powders were confirmed by the cohesion values that were higher for the fine powder. The fine powder had a lower angle of internal friction but higher wall friction angle compared to the coarse powder.

scholarly journals PENGARUH PERENDAMAN PARTIKEL TERHADAP SIFAT FISIS DAN MEKANIS PAPAN PARTIKEL DARI AMPAS TEBU (Saccharum officinarum)

PERENNIAL ◽  
2008 ◽  
Vol 4 (1) ◽  
pp. 6
Author(s):  
Apri Heri Iswanto ◽  
Zahrial Coto ◽  
Kurniawansyah Effendy
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Modulus Of Elasticity ◽  
Internal Bond ◽  
Physical And Mechanical Properties ◽  
Saccharum Officinarum ◽  
Hot Water ◽  
Modulus Of Rupture ◽  
Thickness Swelling ◽  
Holding Power

The objective of this research is to research the effect of particle soaking to physical and mechanical properties particleboard that resulted. The best result of particleboard is particleboard with treatment of hot water soaking. From this result obtained average of physical properties of particleboard (i.e. density, moisture content, water absorption, and thickness swelling) are 0.7 g/cm3; 9.58%; 52.27%; 10.05%. While the result average of mechanical properties of particleboard (i.e. Modulus of Rupture, Modulus of Elasticity, Internal Bond and Screw Holding Power) are 118.79 kg/cm2; 8.909 kg/cm2; 1.85 kg/cm2; 28.40 kg. Key words: Soaking, bagasse, particleboard, physical and mechanical properties References

scholarly journals Effects of Soil Bulk Density and Moisture Content on the Physico-Mechanical Properties of Paddy Soil in Plough Layer

Water ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2290
Author(s):  
Kan Zheng ◽  
Jian Cheng ◽  
Junfang Xia ◽  
Guoyang Liu ◽  
Lei Xu
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Bulk Density ◽  
Paddy Soil ◽  
Yangtze River ◽  
Soil Bulk Density ◽  
Plasticity Index ◽  
The Yangtze River ◽  
Swelling Rate ◽  
Plough Layer

For paddy-upland rotation areas in the middle and lower reaches of the Yangtze River, the paddy soil has undesired physico-mechanical properties of tillage during the dry season. The purpose of this study is to determine the effects of soil bulk density and moisture content on the physico-mechanical properties of paddy soil in the plough layer. The bulk density and moisture content were selected as experimental factors, and the cohesion, tangential adhesion, plasticity index, and soil swelling rate were chosen as experimental indices from physico-mechanical properties of paddy soil in the plough layer. The experimental factors were quantitatively analyzed to explore the change characteristics of the physico-mechanical properties of paddy soil in the plough layer. Conclusions were obtained that show that when the bulk density increased in the range of 1 to 1.6 g·cm−3, the cohesion, tangential adhesion, plasticity index, and swelling rate of paddy soil increased in different degrees. Between 15% and 35% moisture content, the cohesion increased first and then decreased with the increase of moisture content, while the peak cohesion value occurred at the moisture content of 20%. Moisture content was positively correlated with tangential adhesion and negatively correlated with soil swelling rate. This study provides a reference for the regulation of paddy soil tillability in the middle and lower reaches of the Yangtze River Basin.

Kemungkinan Pemanfaatan Beberapa Jenis Rotan Non Komersial Ditinjau Dari Sifat-Sifat Fisik Mekanik

2020 ◽  
Vol 21 (2) ◽  
pp. 32-36
Author(s):  
Heriad Daud S Alusu ◽  
Eva Nurmarini ◽  
Ita Merni Patulak
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Moisture Content ◽  
Modulus Of Elasticity ◽  
Large Diameter ◽  
Small Diameter ◽  
Basic Properties

This research was conducted to determine the basic properties of rattan which are related to the possibility of its use, which are physical-mechanical properties consisting of moisture content, density, parallel tensile strength and modulus of elasticity. There were 12 species of non-commercial rattan studied, 11 species included in the small diameter rattan category (<18 mm diameter) and 1 species belonging to the large diameter rattan category (> 18 mm diameter), namely Daemonorops korthlasii Blume. Based on the results of the tests carried out, there are three species of non-commercial rattan that have similar or similar basic properties to commercial rattan, namely Calamus conirostris Becc., Korthalsia ferox Becc., and Calamus muricatus Becc.

Sign in / Sign up

Export Citation Format

Share Document