SPECIFIC FEATURES OF DEFORMATION OF THE GROOVED CONVEYOR BELT AT LOW TENSIONS

2020 ◽  
pp. 46-53
Author(s):  
V.P. DYACHENKO ◽  
◽  
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Longitudinal Direction ◽  
Conveyor Belt ◽  
Bending Radius ◽  
Conveyor Belts ◽  
Low Tension ◽  
Rubber Fabric

The article presents analytical dependences for the maximum permissible bending radius of the conveyor belt in the longitudinal direction, in which the shape of the gutter is lost in areas with low tension, depending on the design and physical and mechanical properties of the belt. The results of calculations based on these dependencies for a number of modern rubber-fabric and rubber-rope belts are presented. The results obtained can be applied to determine the minimum allowable belt tension and the maximum allowable belt deflection, which usually occur in the loading zone of the conveyor and are the starting value when constructing a tension diagram in the process of traction calculation of the conveyor. They are also useful for determining the parameters of transition sections of conveyor belts.

scholarly journals Influence of incubation time on the vibration and mechanic properties of mycowood

Holzforschung ◽  
2016 ◽  
Vol 70 (6) ◽  
pp. 557-565 ◽  
Author(s):  
Marjan Sedighi Gilani ◽  
Jürg Neuenschwander ◽  
Markus Heeb ◽  
Roman Furrer ◽  
Sergio J. Sanabria ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Sound Velocity ◽  
Treatment Time ◽  
Characteristic Impedance ◽  
Weight Ratio ◽  
Physical And Mechanical Properties ◽  
Longitudinal Direction ◽  
White Rot ◽  
White Rot Fungus ◽  
Fungal Treatment

Abstract The goal of the current study was to investigate the physical and mechanical properties of mycowood as a high quality tone-wood, obtained from Norway spruce by treatment of the white rot fungus Physisporinus vitreus as a function of the treatment time. In focus was the stiffness to weight ratio, which is often considered a main criterion for tone-wood selection. The vibro-mechanical properties were tested by non-destructive methods. The change of color and density were also measured after 4–12 months of fungal incubation. Density decreased up to 5% after 12 months of fungal treatment. Sound velocity was measured in small size specimens by means of the free-free vibration approach, while in large specimens the air-coupled ultrasound method was applied. The two techniques gave similar results and indicated that the sound velocity decreased in mycowood. Internal damping was increased in mycowood to a higher extent than the reduction in the specific modulus of elasticity (E/ρ) and thus the sound velocity in the material. The sound velocity was decreasing with increasing incubation times and scattering of data with this regard was larger in the transversal than in the longitudinal direction. The sound radiation coefficient and the characteristic impedance were enhanced in mycowood and its color was more brownish and richer in tone.

scholarly journals PHYSICAL AND MECHANICAL PROPERTIES OF JUVENILE Schizolobium amazonicum WOOD

2018 ◽  
Vol 42 (1) ◽  
Author(s):  
Graziela Baptista Vidaurre ◽  
Benedito Rocha Vital ◽  
Angélica de Cássia Oliveira ◽  
José Tarcísio da Silva Oliveira ◽  
Jordão Cabral Moulin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Native Species ◽  
Basic Density ◽  
Physical And Mechanical Properties ◽  
Longitudinal Direction ◽  
Wood Properties ◽  
Longitudinal Contraction ◽  
The North ◽  
World Demand ◽  
Fast Growing Species

ABSTRACT Growth in world demand for wood implies a search for new fast growing species with silvicultural potential, and in this scenario for native species such as Paricá . Thus, the objective of this study was determining the physical and mechanical wood properties of the Schizolobium amazonicum species (known as Paricá in Brazil). Trees were collected from commercial plantations located in the north of Brazil with ages of 5, 7, 9 and 11 years. Four logs from trees of each age in the longitudinal direction of the trees were obtained, and later a diametrical plank of each log was taken to manufacture the specimens which were used to evaluate some physical and mechanical properties of the wood. The basic density of Paricá was reduced in the basetop direction and no difference between the radial positions was observed, while the average basic density of this wood was characterized as low. The region close to the bark showed less longitudinal contraction and also greater homogeneity of this property along the trunk, while for tangential contraction the smallest variation was found in the region near the pith. Paricá wood contraction was characterized as low. Age influenced most of the mechanical properties, where logs from the base had the highest values of mechanical strength.

scholarly journals The Results of laboratory tests of the physical and mechanical properties of camelina sativa and the mode of operation of the newly designed seed metering

2020 ◽  
Vol 29 (1) ◽  
pp. 169-176
Author(s):  
Erdenedalai Jantsanpurev ◽  
Munkhbat Bazarjav ◽  
Mungun Jargalsaikhan ◽  
Lkhagvasuren Luvsan
Keyword(s):  
Mechanical Properties ◽  
Seed Weight ◽  
Physical And Mechanical Properties ◽  
Conveyor Belt ◽  
Camelina Sativa ◽  
Test Results ◽  
Volume Weight ◽  
Mode Of Operation ◽  
Laboratory Device

The physico-mechanical properties of the seeds of the small-seeded plant, camelina sativa, were determined. The groove disc-shaped seed metering designed to depend on the physical and mechanical properties of the seed. The seed volume weight 674.5 ± 6.8 g, the absolute seed weight was 1.24 ± 0.09 g. The newly invented groove disc-shaped seed metering was tested on the laboratory device where mounted SZP-3.6 with conveyor belt and while customized speed of the metering shaft and of the tooth height, with a total number of 15 measurements on each tooth. The test results were processed by STATISTICA. It suggested the highest quality of feed index by modified toothed seed disk to be m= 3.75gr at disk tooth height of h=2mm, and disk speed at n=13r/min. Камелина сативагийн үрийн физик-механик шинж чанар болон зохион бүтээсэн үрлэх аппаратын ажиллах горимыг лабораторийн туршилтаар тодорхойлсон дүн Жижиг үрт тосны ургамал камелина сативагийн (Сamelina sativa) үрийн физик-механикийн шинж чанарыг тодорхойлон ховил бүхий диск хэлбэрийн катушкан үрлэх аппаратыг үрийн физик механик шинж чанараас нь хамааруулна зохион бүтээж туршив. Лабораторийн туршилтаар үр унасан эгнээний уртын дагуух үрийн жигд бус тархалт,  дискний ховилын өндөр, катушкийн эргэлтийн давтамжаар катушкаар гарах үрийн хэмжээг тогтооход эзлэхүүн жин  674,5±6,8гр, 1000 ширхэг үрийн жин  1,24±0,09 гр байв. Шинээр зохион бүтээсэн ховил бүхий дискэн үрлэх аппаратыг лабораторийн төхөөрөмж болох туузан дамжуулгатай СЗП-3.6 үрлүүрийн хэсэгт угсарч катушкын эргэлтийн давтамж, дискний шүдний өндрийг  мм байхаар өөрчлөн хэмжилтийг шүд тус бүр дээр 5 давталттай 15 удаагийн хэмжилт авч явуулж үр дүнг STATISTICA програмаар боловсруулав. Оновчлолын үр дүнгээр катушкын шүдний өндөр 2 мм, эргэлтийн давтамж n=13 эрг/мин байхад катушкаар хамагдаж гарах үрийн хэмжээ m=3,75 гр байх  зохистой параметрүүд тогтоогдсон.  Түлхүүр үг:  үрийн физик-механикийн шинж, ховил бүхий дискэн үрлэх аппарат, үрийн хоолой, үр чиглүүлэгч

scholarly journals Production and Characterization of Large-Scale Recycled Newspaper Enhanced HDPE Composite Laminates

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 851 ◽  
Author(s):  
Binwei Zheng ◽  
Litao Guan ◽  
Weiwei Zhang ◽  
Jin Gu ◽  
Dengyun Tu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Laminates ◽  
Large Scale ◽  
Stress Transfer ◽  
Laminated Composite ◽  
Physical And Mechanical Properties ◽  
Longitudinal Direction ◽  
Industrial Applications ◽  
Splicing Pattern

Recycled newspaper (NP)/high density polyethylene (HDPE) laminated composite can reach the physical and mechanical criteria for most industrial applications, which shows the potential of using solid-state waste paper in engineering materials. Herein, the effects of splicing pattern and size on the physical and mechanical properties of the laminated composite were investigated with the ultimate purpose to fabricate a large-scaleale composite. The laminated composite with a stair-like splicing had better physical and mechanical properties than that with a vertical splicing. An efficient stress transfer could be guaranteed when the distance between the two adjacent junctions were greater than a critical proportion of 1/32 of the length at longitudinal direction. The tensile and flexural properties of the large-scaleale composite with a stair-like splicing, which was fabricated at the splicing ratio of 1/32, were 109 ± 4.2 MPa (MOR), 9836 ± 411 MPa (MOE), 119 ± 7.1 MPa (MOR) and 10002 MPa ± 347 (MOE).

PEMANFAATAN KAYU AKASIA MANGIUM (Acacia mangium Willd) UNTUK MEBEL

2012 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Djoko Purwanto
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Physical Properties ◽  
Treatment Process ◽  
Acacia Mangium ◽  
Physical And Mechanical Properties ◽  
Wood Fibers ◽  
Test Parameters ◽  
Mechanical And Physical Properties ◽  
Scale Scores

Timber Acacia mangium (Acacia mangium, Willd) for Furniture. The study aims to determine the mechanical and physical properties and the decorative value (color and fiber) wood of acacia mangium with using finishing materials. This type of finishing material used is ultran lasur natural dof ,ultran lasur classic teak, aqua politur clear dof, aqua politur akasia dan aqua politur cherry. After finishing the wood is stored for 3 months. Test parameters were observed, namely, physical and mechanical properties of wood, adhesion of finishing materials, color and appearance of the fiber, and timber dimensions expansion. The results showed that the mechanical physical properties of acacia wood qualified SNI. 01-0608-89 about the physical and mechanical properties of wood for furniture, air dry the moisture content from 13.78 to 14.89%, flexural strength from 509.25 to 680.50 kg/cm2, and compressive strength parallel to fiber 342.1 - 412.9 kg/cm2. Finishing the treatment process using five types of finishing materials can increase the decorative value (color and fiber) wood. Before finishing the process of acacia mangium wood has the appearance of colors and fibers and less attractive (scale scores 2-3), after finishing acacia wood fibers have the appearance of colors and interesting and very interesting (scale 4-5).Keywords: mangium wood, mechanical properties, decorative value, finishing, furniture.

Physical and Mechanical Properties of Tenun Pahang Fabrics using Alternative Yarns

2016 ◽  
Vol 13 (2) ◽  
pp. 67
Author(s):  
Engku Liyana Zafirah Engku Mohd Suhaimi ◽  
Jamil Salleh ◽  
Suzaini Abd Ghani ◽  
Mohamad Faizul Yahya ◽  
Mohd Rozi Ahmad
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
The Other ◽  
Silk Fabrics ◽  
Recovery Angle ◽  
Made In

An investigation on the properties of Tenun Pahang fabric performances using alternative yarns was conducted. The studies were made in order to evaluate whether the Tenun Pahang fabric could be produced economically and at the same time maintain the fabric quality. Traditional Tenun Pahang fabric uses silk for both warp and weft. For this project, two alternative yarns were used which were bamboo and modal, which were a little lower in cost compared to silk. These yarns were woven with two variations, one with the yarns as weft only while maintaining the silk warp and the other with both warp and weft using the alternative yarns. Four (4) physical testings and three (3) mechanical testings conducted on the fabric samples. The fabric samples were evaluated including weight, thickness, thread density, crease recovery angle, stiffness and drapability. The results show that modal/silk and bamboo silk fabrics are comparable in terms of stiffness and drapability, hence they have the potential to replace 100% silk Tenun Pahang.

Basic set of experiments for determination of mechanical properties of sand

2014 ◽  
Vol 62 (1) ◽  
pp. 129-137
Author(s):  
A. Sawicki ◽  
J. Mierczyński
Keyword(s):  
Mechanical Properties ◽  
Soil Mechanics ◽  
Physical And Mechanical Properties ◽  
Local Strain ◽  
Initial State ◽  
Laboratory Equipment ◽  
Additional Information ◽  
Basic Set ◽  
Initial Anisotropy

Abstract A basic set of experiments for the determination of mechanical properties of sands is described. This includes the determination of basic physical and mechanical properties, as conventionally applied in soil mechanics, as well as some additional experiments, which provide further information on mechanical properties of granular soils. These additional experiments allow for determination of steady state and instability lines, stress-strain relations for isotropic loading and pure shearing, and simple cyclic shearing tests. Unconventional oedometric experiments are also presented. Necessary laboratory equipment is described, which includes a triaxial apparatus equipped with local strain gauges, an oedometer capable of measuring lateral stresses and a simple cyclic shearing apparatus. The above experiments provide additional information on soil’s properties, which is useful in studying the following phenomena: pre-failure deformations of sand including cyclic loading compaction, pore-pressure generation and liquefaction, both static and caused by cyclic loadings, the effect of sand initial anisotropy and various instabilities. An important feature of the experiments described is that they make it possible to determine the initial state of sand, defined as either contractive or dilative. Experimental results for the “Gdynia” model sand are shown.

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