Jo ou ur rn na al l o of f S Su us st ta ai in na ab bl le e D De ev ve el lo op pm me en nt t o of f T Tr ra an ns sp po or rt t a an nd d L Lo og gi is st ti ic cs s
To calculate the stress-deformed state of road-tanker metal structures during the liquid cargo transportation, the solution for bending axially and symmetrically loaded circular plates is proposed, which is based on the theory of elasticity approach. Dependencies for calculating stresses and displacements under arbitrary load law and support type are substantiated. Deformation of the support under the action of axisymmetric loading leads to appearance of a temperature field.
Develop a method for determining and evaluating the stress-strain state, particularly the distribution of thermomechanical stresses in the materials of individual rotating parts of vehicles.The proposed method is based on the principle of gradual approximations of the solution when the boundary conditions are satisfied on the curvilinear limiting surfaces of the disk body.The proposed method of determining and estimating the distribution of thermomechanical stresses in the disk material makes it possible to take into account the variable geometry: thickness and presence of a hole in the central part of the disk, also correctly determine stress-strain state at any point of unevenly heated rotating axial body.The work uses generally accepted assumptions and limitations for thermomechanical calculations.It is proved that in real disks, the stress-strain state is spatial, and the well - known method based on the hypotheses of the plane-stress state does not provide the possibility of calculating the values of stresses in the thickness of the disk. The obtained results can be used to improve the methodology of auto technical examination of road accidents. In addition, they can be taken into account by bus drivers on urban routes when choosing a safe distance in heavy traffic, as well as design engineers of car brake systems.
Purpose: To ensure an adequate level of accuracy, it is rational to study the ponderomotor
forces of the ring, which drive a hollow disk of variable thickness, hung on the ring.
Design/methodology/approach: The solution of the motion problem of a hollow disk of
variable thickness suspended on a force ring of rectangular cross section is based on the
method of solving the equations of the theory of thermoelasticity. The stress-strain state,
as well as the motion of the specified body of rotation, the disk, in studies in a cylindrical
coordinate system, under the action of ponderomotor forces.
Findings: The motion equation of a hollow disk hung on a force ring-torus is made, exact
solutions of the motion equations of a ring in the torus form of rectangular cross section are
found. New component expressions of ponderomotor forces, which appear from the action
of the ring's own electromagnetic field and cause the motion of a hollow disk, have been
found on the basis of Maxwell's equations. It is proved that at high speeds and low natural
accelerations the stress - strain state of the disk material does not cause the destruction of
the structure.
Research limitations/implications: Calculations of ponderomorphic forces are valid for
the ring, which drives a hollow disk of variable thickness, hung on the ring.
Practical implications: It is proved that at high velocities and small natural accelerations
the stress-strain state of the disk medium does not cause structural damage. It is determined
that the rotation in the direction of movement at an angle of 90 degrees changes only the
direction of the acceleration vector without increasing its value.
Originality/value: The dependences between own time and coordinate time are
formulated. It is proved that a small change in the natural time for the studied disk can
significantly change the coordinate time, and the pulsed electromagnetic field provides the
ability to cover infinitely large distances over finite periods of time.
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