Solving the problem of elasticity for round thick plates at axially symmetric strain

An exact solution of the equations of elasticity for round plates loaded axially symmetric. The problem of bending round plates, which are under the influence of normal forces attached to any law to load any type of resistance. It is shown that pasture circular plate under axially symmetric load leads to appearance of temperature field.


Main material
It is known (Holdenblat, I.I.,1969;Popovych, P. V., & Slobodyan, Z. B., 2014) that the exact solution of elasticity considered only solid round plates, loaded evenly distributed pressure constant intensity.The law can be an arbitrary load type and resistance plate type.

Fig. 1. Scheme plate under uniformly distributed load
Components of stress are determined by Hook`s law (Germain, P., 1983).
1, 2, 3; ij  (3) under certain dependencies between deformations and displacements: For circuit system equilibrium equations (1) should be added heat equation (Germain, P., 1983): By W marked quantity of heat produced or absorbed per unit volume of the body with its deformation;  -Thermal conductivity;  linked to thermostatic potential displacement formula (Germain, P., 1983): In this case, we present the movement as such: thermal expansion е we find in expression (4) given (9): Integrating the first equation in r and the second on z , we obtain the formula for determining the temperature variable: Suppler find out Hooke's law (Landau, L.D. & Livshits, E.M., 1987), where the temperature change  can be determined using equation ( 12).
Then we have:     ;; ;; To solve the equations of elasticity should select a function of displacement   , rz  in a way that allows you to satisfy specific boundary conditions of the problem.
Next, consider bending round plates in the exact formulation of the problem of elasticity, which is attached under normal force   Pr any law load symmetrically about the axis of rotation z , when any type of resistance.
Using strain of

33
 from ( 6) that satisfies the conditions (7) and compared with the voltage 33  from the equation ( 13), we obtain the differential equation for determining the function   Integrating this equation by r between 1 а to r , We get: Where   1 fz -Arbitrary function integration; 1 a -The radius of the central aperture plate.
If the solid plate ( fz it should be considered to be zero for finite displacements   ur.
Repeating the process of integrating with r between 1 а to r , We get: Where   2 fz -arbitrary function integration.
For ease of calculation, consider a solid cylindrical plate [ where і А -Arbitrary constants of integration.By movements (23) we find Voltage: Expressions ( 23) and ( 24) is the exact solution of equilibrium equations ( 1

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To illustrate the elastic and thermodynamic reversibility above mentioned problems of elasticity theory for axisymmetric deformation of plates, we simplify decision,   0 P r P const  suggesting that see Fig. 1 Then we have the function of displacement ( 17): For the tangent of tension ( 19), choose: The size of the support reactions on the edge of the plate is: Radial displacement (28) does such resistance plate, allowing the movement of plates in the direction of the axis.
Normal movement (30) allows for different anchor point to secure the appliance on their vertical displacement.
Consider as an example hinge fixing points circuit boards in the median plane, that is: Satisfying these boundary conditions for moving (31), we obtain for any sustainable integration 1 C : After substituting this value in (30), we get: Voltage corresponding displacement (30) and ( 33) are as follows:   The function of displacement ( 25), after substituting ( 29) is:  We know that the external load, surface and volume, leading to deformation of the body while causing the appearance of temperature changes in it (Landau, L.D. & Livshits, E.M., 1987).The change in temperature makes Thus, when changing deformation point temperature of the body is a result of absorption or heat insulated elastic body, with its interaction of the environment (Melanie, E., & Parkus, G., 1958).This temperature change curved round to the load plate 0 Р defines dependence (37).
If you remove the load 0 0 Р  voltage (34) and temperature change (37) disappear and the plate returned to its not intense and deformed original condition.The process is very slow deformation, which means it will be thermodynamically reversible (Timoshenko, S.P., & Huder, J., 1979).
Exploring plate deformation and temperature change it from outside the load.Substituting axial displacement (33) 2 h z  we get the upper layers of compression plates in key areas: For the bottom surface of the plate at 2 h z  we get: that will have stretched zone.
It is a known fact from the theory of physical structures bend.Then examine temperature change of formula (33) for a compressed zone.Find: To get stretched zone: As you can see, the temperature of the compressed zone will be slightly higher then the temperature of stretched zone.In other words, compressed zone generates heat   0 TT  and stretched it absorbs zone   0 TT  , That is a plate heat exchange with the environment.A similar theory was developed by Karl Zener (Feng, J., 1986) for thin plate bending vibrations at her and was brilliant experimental confirmation.Substituting variable temperature (37), which appears by bending a round plate of uniformly distributed load intensity constant in the equation ( 5) is the heat capacity flow in areas of the plate.
For compressed zone at the plate the heat goes.
To straighten the zone plate goes absorb heat from the environment.Consequently, there is heat conduction through the heat flow from the compressed zone to straighten.

Conclusions
Thus, in solving the problem of elasticity theory for axisymmetric bending loaded circular plates, the formula of intensity and displacements received for the first time.Law of loading can be any type, and the type of resist -either.The resulting solution indicates that the effect of external forces leads to the appearance of temperature changes at bending of round plates and occurrence of heat flow.
) and (2) because the last turn after substituting for identity.Function   , rz  must satisfy the equation (12), by which is possible to determine the temperature variable   , rz  , which is forming because of the actions of external pressures and dependence on boundary conditions.
T -Absolute temperature points of the body, 0 T -Temperature fatigue-free body at the time 0 t  .
For its definition use the method based on translational approximations solution proposed by one of the authors.After mathematical transformations we get value of 33 Solving the problem of bending circular plates under arbitrary axisymmetric load intensity   х Pr requires the setting of normal axial tension 33  .‹ 42 › This is the first time when we get this kind of solving of the bending thick plate problem.Terms of impedance (resistance) plates allow you to determine the exact value movements on formulas (8), using (17).
2u accepted as such: