scholarly journals Mathematical modeling of the spherical bearing deformation behavior of bridges with technological grooves for lubrication under a normative vertical load

2021 ◽  
Author(s):  
Анна Каменских ◽  
Юрий Носов
Keyword(s):  
Mathematical Modeling ◽  
Deformation Behavior ◽  
Vertical Load ◽  
Spherical Bearing

scholarly journals Structural and mechanical parameters of the dough semi-finished product for culinary flour products

2021 ◽  
Vol 23 (95) ◽  
pp. 7-12
Author(s):  
M. Perepelytsia
Keyword(s):  
Mathematical Modeling ◽  
Mechanical Properties ◽  
Model Test ◽  
Deformation Behavior ◽  
Nutritional Value ◽  
New Technologies ◽  
Raw Materials ◽  
Plastic Viscosity ◽  
Functional Composition ◽  
Mechanical Parameters

Taking into account the need to improve existing, optimize and create new technologies for flour culinary products, there is a need to use non-traditional raw materials for the design of flour culinary products of high nutritional value. The prescription composition of these products is adjustable, which allows you to create foods that meet the traditional requirements for consumer properties and modern requirements of nutrition. The article investigates the structural and mechanical parameters of the dough semi-finished product for flour culinary products. The influence of protein-fat additive and carrageenan on structural and mechanical properties that characterize the deformation behavior of the dough semi-finished product under stress conditions, the main indicators of which at applied force are the ultimate stress, plastic viscosity, modulus of elasticity. In order to develop the technology of flour culinary products using BJD ESO and carrageenan, it is important to determine the rational concentration of additives and the method of their introduction into the dough semi-finished product. For the manufacture of model dough compositions were added BJD ESO was added in an amount of from 5 to 30 % and carrageenan from 0.5 to 3.0 % instead of wheat flour. According to the results of research, the influence of BJD ESO and carrageenan on the structural and mechanical properties of the dough semi-finished product was established. When the concentration of BJD ESO increases from 5 to 30%, the value of plastic viscosity decreases by 3.2–67.3 %, respectively. Therefore, to improve the structural and mechanical properties in the model test compositions added carginan. When the concentration of carrageenan increases from 0.5 to 3.0 %, the value of the plastic viscosity of fresh dough increases by 0.9–18.4 %, respectively. At the concentration of carrageenan 1.0%, the value of the indicator is close to the control (7.06 PA×s*108) and is 7.12 and 7.27 PA×s*108. Therefore, using the methods of mathematical modeling taking into account the structural and mechanical properties, determined the rational concentrations of the functional composition for the test semi-finished product – 11 % (1.0 % carrageenan and 10.0 % BJD ESO, which can be used in the technology for new types of dough semi-finished products for flour culinary products.

scholarly journals Performance Effects of Shock Absorber and Spiral Springs Against Vertical Vehicle Expenses Weighing the Road Structure

2020 ◽  
Vol 7 (1) ◽  
pp. 79
Author(s):  
Simon Ka'ka ◽  
Festo Andre H
Keyword(s):  
Mathematical Modeling ◽  
Shock Absorber ◽  
Reaction Force ◽  
The Body ◽  
Road Surface ◽  
Vertical Load ◽  
The Road ◽  
Performance Effects ◽  
On The Road ◽  
System Transfer Function

This study aims to examine more about the effect of vertical dynamic load of vehicles and changes in dimensional barriers on the road surface in its path. Experimentally this fluctuating load is replaced by a pneumatic force change based on the regulation of air pressure on the regulator. The deviations generated by the varying load work are measured by placing a proximity sensor along the spring movement. The amount of vertical load transformation reaches the road surface is measured by using Load cell. Characteristics of vertical dynamic vibration occurring due to several dimensional barriers, U (cm) obtained using mathematical modeling method with 2 DOF suspension system transfer function.  The results showed a condition on the body and wheels of vehicles experienced a brief overshot for 0.14 seconds with deviation of 0.178 m. From the graph shows that the rate of deviation that occurs is large enough that Y2d = 1.03 m / s caused by a sudden shock that occurred on the wheels of the vehicle. This condition does not last long that is only duration t = 0.22 s, because the spring reaction force and shock absorber can absorb 25% vibration against the sprung and un-sprung vertical load of the vehicle.

Mathematical modeling of the hot-deformation behavior of superalloy IN718

1999 ◽  
Vol 30 (10) ◽  
pp. 2701-2712 ◽  
Author(s):  
J. M. Zhang ◽  
Z. Y. Gao ◽  
J. Y. Zhuang ◽  
Z. Y. Zhong
Keyword(s):  
Mathematical Modeling ◽  
Hot Deformation ◽  
Deformation Behavior ◽  
Hot Deformation Behavior

Plastic deformation of θ ' in Al-4%Cu alloy

1978 ◽  
Vol 36 (1) ◽  
pp. 576-577
Author(s):  
Shrikant P. Bhat
Keyword(s):  
Deformation Behavior ◽  
Room Temperature ◽  
Electron Microscopic Observation ◽  
Bulk Alloy ◽  
Electron Microscopic ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Orowan Mechanism ◽  
The Subject ◽  
Cyclic Straining

deformation behavior of Al-Cu alloys aged to contain θ ' has been the subject of many investigations (e.g., Ref. 1-5). Since θ ' is strong and hard, dislocations bypass θ ' plates (Orowan mechanism) at low strains. However, at high strains the partially coherent θ ' plates are probably sheared, although the mechanism is complex, depending on the form of deformation. Particularly, the cyclic straining of the bulk alloy is known to produce gross bends and twists of θ '. However, no detailed investigation of the deformation of θ ' has yet been reported; moreover, Calabrese and Laird interpreted the deformation of θ ' as largely being elastic.During an investigation of high temperature cyclic deformation, the detailed electron-microscopic observation revealed that, under reversed straining conditions, θ ' particles are severely distorted--bent and twisted depending on the local matrix constraint. A typical electronmicrograph, showing the twist is shown in Fig. 1. In order to establish whether the deformation is elastic or plastic, a sample from a specimen cycled at room temperature was heated inside the microscope and the results are presented in a series of micrographs (Fig. 2a-e).

Observation of secondary slip systems in tungsten bicrystals

1984 ◽  
Vol 42 ◽  
pp. 478-479
Author(s):  
J. R. Fekete ◽  
R. Gibala
Keyword(s):  
Stress Field ◽  
Grain Boundaries ◽  
Deformation Behavior ◽  
Stress Axis ◽  
Polycrystalline Materials ◽  
Slip Systems ◽  
Metallic Materials ◽  
Twist Boundary ◽  
Secondary Slip ◽  
Plane Normal

The deformation behavior of metallic materials is modified by the presence of grain boundaries. When polycrystalline materials are deformed, additional stresses over and above those externally imposed on the material are induced. These stresses result from the constraint of the grain boundaries on the deformation of incompatible grains. This incompatibility can be elastic or plastic in nature. One of the mechanisms by which these stresses can be relieved is the activation of secondary slip systems. Secondary slip systems have been shown to relieve elastic and plastic compatibility stresses. The deformation of tungsten bicrystals is interesting, due to the elastic isotropy of the material, which implies that the entire compatibility stress field will exist due to plastic incompatibility. The work described here shows TEM observations of the activation of secondary slip in tungsten bicrystals with a [110] twist boundary oriented with the plane normal parallel to the stress axis.

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