Application of Fem Method for Modeling and Strength Analysis of Feed Elements of Vibroscreen

Mathematical and experimental study of deformations of a steel roll of a road roller with a variable geometry of a contact surface

“…2) developed one-dimensional physical and mathematical models of cylindrical bending, clearly illustrated with characteristic numerical examples of a circular shell (K) and elliptical (E) outlines (Abdeev et al, 2011) (Fig. 2); 3) in the process of the performed calculations, it was proved that the considered elastic element with a thickness of 6.5 mm and a radius of 600 mm was deformed within the Hooke's law at stresses of not more than 86.9% of the yield strength т = 2270 MPa ( 2 ) steel grade 60C2XA (Abdeev et al, 2011) and theoretical safety factors у (к) = 5,8 and у ( ) =2,62 were much higher than the minimum acceptable value [ у ]=1,5 (Doudkin et al, 2019); 4) it was found that to prevent the occurrence of residual deformations, local dents and clicking (Kolkunov, 1972) of the shell, it is necessary to use only high-quality springspring steel with high т ≥1800 MPa ( 2 ) to make it, which is of great importance in this particular case -with high requirements for fatigue strength (Abdeev et al, 2011) and local resistance, corrosion and thermal resistance; in this regard, it is possible to recommend, for example, alloys on a cobalt-chromium-nickel base of the grades 40КХНМ, 40КХНМВТU (GOST 10994-74) with т = 1800 ÷ 2500 MPa ( 2 ) and also some other special structural elastically deformable steels (60C2FA, 60C2XFA, 60C2XA, 65C2BA, etc. ); 5) the results of mathematical modeling and FEM analysis make it possible to optimize the physical and geometric characteristics of the flexible shell during its design, thereby ensuring reliable operation of the roller with an adjustable outline of the working surface of the drum, economical consumption of expensive spring-spring steel and high-quality compaction of the road surface.…”

“…under which identities are respected: It is necessary to perform a condition control check (Doudkin et al, 2019…”

“…whence it follows that the margin of safety of the shell for the yield strength σт (Doudkin et al, 2019) varies from 13.1% to 32.8%. The complexity of the mechanical and mathematical study of local deformations of the steel shell of a roller of a road roller with variable geometry of the contact surface and its analytical study makes it advisable to use finite element analysis, for example, using the APM FEM software package for KOMPAS-3D V17.1.…”

Properties of the Steel-Fiber-Reinforcedconcrete With Dispersed Reinforcing Wire Fiber From Technogenic Waste

“…To compare the effectiveness of ITEX fiber with existing analogs, SFRC with an anchor fiber 1/50 Hendix and Dramix 3D 80/60BG was also considered. The amount percentage of reinforcement with wire fiber was adopted as 1%, 1.5% and 2%.The composition of the components for fine-grained concrete matrix was selected in accordance with the recommendations of [3,[8][9][10][11][12] and is shown in table 1.…”

Mechanical and mathematical research of local deformations of a steel roller shell with a variable geometry of contact surface

“…where = ( 1 ) -displacement function in the direction of the coordinate axis 1 (Fig. 3) The equation 17is integrated approximately using the Bubnov-Galerkin method of sufficiently effective and accurate variational analytical method Doudkin et al, 2019). The function ( 1 ) is approximated by a polynomial of the fourth degree (Kolkunov, 1972.…”