889 research outputs found
A sampling surfaces method and its application to three-dimensional exact solutions for piezoelectric laminated shells
No full textAbstractThe application of the sampling surfaces (SaS) method to piezoelectric laminated composite plates is presented in a companion paper (Kulikov, G.M., Plotnikova, S.V., Three-dimensional exact analysis of piezoelectric laminated plates via sampling surfaces method. International Journal of Solids and Structures 50, http://dx.doi.org/10.1016/j.ijsolstr.2013.02.015). In this paper, we extend the SaS method to shells to solve the static problems of three-dimensional (3D) electroelasticity for cylindrical and spherical piezoelectric laminated shells. For this purpose, we introduce inside the nth layer In not equally spaced SaS parallel to the middle surface of the shell and choose displacements of these surfaces as basic kinematic variables. Such choice of displacements permits, first, the presentation of governing equations of the proposed piezoelectric shell formulation in a very compact form and, second, gives an opportunity to utilize the strain–displacement equations, which precisely represent all rigid-body shell motions in any convected curvilinear coordinate system. It is shown that the developed piezoelectric shell formulation can be applied efficiently to finding of 3D exact solutions for piezoelectric cross-ply and angle-ply shells with a specified accuracy using a sufficient number of SaS, which are located at Chebyshev polynomial nodes and layer interfaces as well
Geometrically exact assumed stress-strain four-node element based on the 9-parameter shell model
No full textFinishing of the Helical-bevel Gear Teeth Flanks
No full textAbstractThis paper describes methods of teeth shaving and gridding at helical-bevel gears of involute-bevel gearings. Furthermore, the opportunity of doing these operations on machines for teeth processing in common bevel gears is shown.The possibility of these operations’ performance on the equipment that is used for common helical gears teeth processing is showed
Control of cylinder-conical cogs referral
No full textЛопатин Борис Александрович. Доктор технических наук, профессор, почетный работник науки и техники РФ, заведующий кафедрой «Техническая механика», Южно-Уральский государственный университет, филиал в г. Златоусте, [email protected].
Зайнетдинов Радамир Имамгалиевич. Кандидат технических наук, доцент, доцент кафедры «Техническая механика», Южно-Уральский государственный университет, филиал в г. Златоусте, [email protected].
Плотникова Светлана Викторовна. Кандидат технических наук, доцент, доцент кафедры «Техническая механика», Южно-Уральский государственный университет, филиал в г. Златоусте, [email protected]. B.A. Lopatin, South Ural State University, branch in the Zlatoust, Zlatoust, Russian Federation,
[email protected],
R.I. Zaynetdinov, South Ural State University, branch in the Zlatoust, Zlatoust, Russian Federation,
[email protected],
S.V. Plotnikova, South Ural State University, branch in the Zlatoust, Zlatoust, Russian Federation,
[email protected]Получены зависимости и рассмотрен порядок определения размера по шарикам неэвольвентной шестерни цилиндро-конической передачи внутреннего
зацепления, приведена схема алгоритма программы расчета на ЭВМ. Dependencies are received and sequence of determining the size of the balls of
the uninvolute pinion cylindrical-conic toothing is explored, flowchart show program
algorithm for computing
Turbulent plane Couette flow with wall-transpiration
No full textIn the present abstract, DNS results obtained for turbulent plane Couette flow with wall-normal transpiration velocity are presented. Important equations valid in such a flow are derived, describing the total shear stress and the relation between the friction velocities at the lower and upper wall. These expressions are of importance, as there are neither experimental nor DNS data to compare with. Equally important, we derive a center region and a viscous sublayer velocity scaling for the suction wall, which were both validated using the DNS data
Exact electroelastic analysis of functionally graded piezoelectric shells
No full textAbstractA paper focuses on implementation of the sampling surfaces (SaS) method for the three-dimensional (3D) exact solutions for functionally graded (FG) piezoelectric laminated shells. According to this method, we introduce inside the nth layer In not equally spaced SaS parallel to the middle surface of the shell and choose displacements and electric potentials of these surfaces as basic shell variables. Such choice of unknowns yields, first, a very compact form of governing equations of the FG piezoelectric shell formulation and, second, allows the use of strain–displacement equations, which exactly represent rigid-body motions of the shell in any convected curvilinear coordinate system. It is worth noting that the SaS are located inside each layer at Chebyshev polynomial nodes that leads to a uniform convergence of the SaS method. As a result, the SaS method can be applied efficiently to 3D exact solutions of electroelasticity for FG piezoelectric cross-ply and angle-ply shells with a specified accuracy by using a sufficient number of SaS
Correction to " Saint-Santin Radar Observations of Lower Thermospheric Storms"
No full textInternational audienceIn the paper "Saint-Santin Radar Observations of Lower Thermospheric Storms" by C. Mazaudier, R. Bernard and S.V. Venkateswaran (Journal of Geophysical Research 90 (A3), 2885-2895) the name of the third author was inadvertently omitted from the first page. A corrected first page follow
On the use of sampling surfaces method for solution of 3D elasticity problems for thick shells
No full textHybrid Stress-Strain Elements based on the First-Order Single-Layer and Layer-Wise Shell Theories
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