نتایج جستجو برای: friction angle

تعداد نتایج: 162612  

In the present investigation, two dimensional elastoplastic finite element analysis was conducted to assess the deformation characteristics of Al 1100 alloy during continuous confined strip shearing (C2S2) process. The results of simulations showed that the plastic strain distribution across the deformed sample is non-uniform irrespective of the amount of friction and C2S2 die angle. The most u...

نوریان, آذین, کچویی, مژگان,

Background and Objective: Resistance to sliding is a combination of friction and binding. When the angle between the bracket and the wire exceeds the critical angle, binding occurs. The influence of angulation is confounding because of certain inherent physical characteristics of materials. The present study was carried out to evaluate the effect of wire- bracket angulation on resistance to sli...

Journal: :journal of agricultural science and technology 2010
gh. habibi bibalani b. majnounian

slope instability due to landslides is particularly common in iran. it is possible to fight against these hazards thanks to the roots of trees, which provide an important contribu-tion towards the stability of hillslopes. however, our knowledge of the effectiveness of roots for slope stability needs improvement. therefore this study was carried out on the effect of tree roots on slope stability...

2017
Tongqing Li Yuxing Peng Zhencai Zhu Shengyong Zou Zixin Yin

Aiming at predicting what happens in reality inside mills, the contact parameters of iron ore particles for discrete element method (DEM) simulations should be determined accurately. To allow the irregular shape to be accurately determined, the sphere clump method was employed in modelling the particle shape. The inter-particle contact parameters were systematically altered whilst the contact p...

Journal: :مهندسی عمران فردوسی 0
آتنا فردوسی فریدون مقدس نژاد اسماعیل افلاکی

in this study, stability of geosynthetic reinforced soil retaining walls investigated using plaxis code that is based on finite element method. the effects of axial stiffness, length and vertical space between geosynthetic layers, internal friction angle of soil wall and cohesion of foundation on deformations of wall and maximum axial force of geosynthetic have been investigated. results of ana...

Journal: :مکانیک سیالات و آیرودینامیک 0
اصغر دشتی رحمت آبادی محسن نکوئی مهر محمد سفید

in this paper, static performance characteristics for a finite lenght two-lobe journal bearing lubricated with micropolar fluid is studied. using finite element method, steady-state film pressure is obtained by solving modified reynolds equation, based on micropolar lubrication theory. with the help of film pressure in bearing, the static performance characteristics in terms of load carrying ca...

Journal: :پژوهش های علوم و صنایع غذایی ایران 0
(pages 88-96) s. m. a. razavi i. zahedi h. mahdavian mehr

due to medical and dietary properties of the plantago major l. seed, it is necessary to know engineering properties in order to design post harvest equipments. engineering properties of plantago major l. seed was determined only at the moisture content of 7.98% dry basis, because of it produces mucilaginous components when it is soaked in water. the average of length, width, surface area, spher...

2008
M. Ghazavi M. Hosseini

ABSTRACT: It may be said that the shape of sand deposition is normally cone and sand grains are oriented a certain angle of deposition repose is made. This angle is such that no stability occurs. Thus the angle of repose is somewhat correlated to the sand internal friction angle. This paper presents the results of a series of laboratory experiments performed three types of sand. For this purpos...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2015
Fernando Alonso-Marroquin Pengyu Huang Dorian A H Hanaor E A Flores-Johnson Gwénaëlle Proust Yixiang Gan Luming Shen

Using spheropolygon-based simulations and contact slope analysis, we investigate the effects of surface topography and atomic scale friction on the macroscopically observed friction between rigid blocks with fractal surface structures. From our mathematical derivation, the angle of macroscopic friction is the result of the sum of the angle of atomic friction and the slope angle between the cont...

Journal: :journal of agricultural science and technology 2011
z. ghorbani a. hemmat a. a. masoumi

physical and mechanical properties of alfalfa (medicago sativa, l.) grind are required for optimum design of equipment used in transporting, processing and storage of the material. this study was conducted to determine the effect of particle size (2.38, 3.36 and 4.76 mm) and moisture content (8, 9.3 and 11% wb) on some physical and mechanical properties of alfalfa grind. these properties includ...

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