scholarly journals Improvement of the inverse numerical-analytical method for calculating the Light Steel Thin-Walled Structures for stability under eccentric compression

2021 ◽  
Vol 18 (1) ◽  
pp. 46-52
Author(s):  
M. O. Smirnov ◽  
Keyword(s):  
Analytical Method ◽  
Analytical Calculation ◽  
Tabular Data ◽  
Thin Walled Structures ◽  
Section Shape ◽  
Overall Stability ◽  
Speed Up ◽  
Numerical Analytical Method ◽  
Thin Walled ◽  
Single Formula

The paper proposes an improved reverse numerical-analytical method for calculating thin-walled cold-formed rod elements for stability, taking into account the loss of local stability and the section shape. The presented approach makes it possible to automate and speed up the process of analytical calculation, which enables quickly obtaining the coefficients of loss of overall stability of rods of the LSTW structures. As a result, a complex and time-consuming calculation process is reduced to using a single formula in combination with the tabular data.

scholarly journals CONCEALED FRAME MADE OF LIGHT STEEL THIN-WALLED STRUCTURES IN MONOLITHIC FOAM CONCRETE

2021 ◽  
Vol 2021 (1) ◽  
pp. 134-137
Author(s):  
Andrey Savenkov ◽  
Evgeniy Zaenec ◽  
Andrey Ketner
Keyword(s):  
Technical Solution ◽  
Foam Concrete ◽  
Standard Version ◽  
Thin Walled Structures ◽  
Overall Stability ◽  
Thin Walled

The use of buildings frame elements formed from thin-walled unclosed profiles located in a monolith-ic foam concrete array is considered. This technical solution provides a number of advantages in comparison with the standard version of metal frames, including increasing the overall stability of lightweight profiles

A novel analytical calculation of magnetic field in the slotted air gap of spoke-type permanent-magnet machines using conformal mapping

2020 ◽  
pp. 1-15
Author(s):  
Jianqi Li ◽  
Yu Zhou ◽  
Jianying Li
Keyword(s):  
Magnetic Field ◽  
Conformal Mapping ◽  
Permanent Magnet ◽  
Flux Density ◽  
Analytical Method ◽  
Electromotive Force ◽  
Analytical Calculation ◽  
Air Gap ◽  
Permanent Magnet Machines ◽  
Peak Value

This paper presented a novel analytical method for calculating magnetic field in the slotted air gap of spoke-type permanent-magnet machines using conformal mapping. Firstly, flux density without slots and complex relative air-gap permeance of slotted air gap are derived from conformal transformation separately. Secondly, they are combined in order to obtain normalized flux density taking account into the slots effect. The finite element (FE) results confirmed the validity of the analytical method for predicting magnetic field and back electromotive force (BEMF) in the slotted air gap of spoke-type permanent-magnet machines. In comparison with FE result, the analytical solution yields higher peak value of cogging torque.

Frame-Monolithic Technology of Construction of Low-Rise Buildings Made of Foam Gypsum and Steel Thin-Walled Structures

2018 ◽  
Vol 762 (8) ◽  
pp. 36-39 ◽  
Author(s):  
B.G. BULATOV ◽  
◽  
R.I. SHIGAPOV ◽  
M.A. IVLEV ◽  
I.V. NEDOSEKO ◽  
...  
Keyword(s):  
Thin Walled Structures ◽  
Thin Walled

scholarly journals Fracture Mechanical Analysis of Thin-Walled Cylindrical Shells with Cracks

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 592
Author(s):  
Feng Yue ◽  
Ziyan Wu
Keyword(s):  
Fracture Mechanics ◽  
Tensile Stress ◽  
Failure Modes ◽  
Cylindrical Shells ◽  
Crack Tip ◽  
Mechanical Analysis ◽  
J Integral ◽  
Thin Walled Structures ◽  
Circumferential Tensile Stress ◽  
Thin Walled

The fracture mechanical behaviour of thin-walled structures with cracks is highly significant for structural strength design, safety and reliability analysis, and defect evaluation. In this study, the effects of various factors on the fracture parameters, crack initiation angles and plastic zones of thin-walled cylindrical shells with cracks are investigated. First, based on the J-integral and displacement extrapolation methods, the stress intensity factors of thin-walled cylindrical shells with circumferential cracks and compound cracks are studied using linear elastic fracture mechanics, respectively. Second, based on the theory of maximum circumferential tensile stress of compound cracks, the number of singular elements at a crack tip is varied to determine the node of the element corresponding to the maximum circumferential tensile stress, and the initiation angle for a compound crack is predicted. Third, based on the J-integral theory, the size of the plastic zone and J-integral of a thin-walled cylindrical shell with a circumferential crack are analysed, using elastic-plastic fracture mechanics. The results show that the stress in front of a crack tip does not increase after reaching the yield strength and enters the stage of plastic development, and the predicted initiation angle of an oblique crack mainly depends on its original inclination angle. The conclusions have theoretical and engineering significance for the selection of the fracture criteria and determination of the failure modes of thin-walled structures with cracks.

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