Definition of Locked-up Stresses around a Rectilinear Welding Seam

Великанов, Н. Л.; Koryagin, S. I.; Sharkov, O. V.

doi:10.1088/1757-899x/124/1/012094

Cited by 12 publications

(2 citation statements)

References 10 publications

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“…Despite the fact that more than 4 decades are involved in the issues of the strength of the GSW, many aspects of design related to the choice of the size of the stiffeners and their location along the length of the beam, the estimation of the magnitude of the critical load, require additional studies, as evidenced by a significant number of publications on the topic [5][6][7][8][9][10][11]. Some papers [7,8] are devoted to the optimisation of stiffening ribs.…”

Section: Fig 1 View Of Girder With Slender Webmentioning

confidence: 99%

Rational Dimensions of Transverse Stiffenning Ribs in Girders with a Slender Web

Pritykin

Kirillov²

2018

MSF

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In thin-walled structures, to which girders with slender web (GSW) are related, one of the weak links is their local stability. Girders with slender web are still buckling in elastic stage of loading under shear deformation. Increasing of their stability is possible to reach with installation of Analysis carried out in the work show that demands to appointment of optimum sizes of transverse stiffening ribs in Russian structural standard differ essentially from those of the foreign standards. The goal of the work is to find out the demands by which the standards are more well grounded and bring in suggestion on improving the Russian structural rules. The determined goal has been reached with GSW panels calculations FEM using the program complex ANSYS. The critical loads were determined in the shear of rectangular plates supported by transverse stiffening ribs of different sizes. The results of the FEM were compared with the calculations performed on the empirical dependencies of different standards. The result of the research was to make recommendations on the rational dimensions of the stiffening ribs, determined from the ratio of flexural stiffnesses of the reinforced plate and rib. It is noted that the presence of stiffening ribs can increase the stability of the beam wall by 15-30%. The results of the research can be used in design organisations.

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Section: Fig 1 View Of Girder With Slender Webmentioning

confidence: 99%

Rational Dimensions of Transverse Stiffenning Ribs in Girders with a Slender Web

Pritykin

Kirillov²

2018

MSF

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“…A lot of researches related to stability and controllability are being conducted [23][24][25][26]. Mathematical calculation methods, basis of screw theory [27], analysis of joining between components [28] and optimisation of kinematic parameters [29] are also usually used for the development of UAVs.…”

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confidence: 99%

Analysis and study of the influence of the geometrical parameters of mini unmanned quad-rotor helicopters to optimise energy saving

Penkov¹,

Александров²

2017

Int. J. Automot. Mech. Eng.

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The article discusses lift force generated by mini UAVs (Unmanned Aerial Vehicles). CFD (Computational Fluid Dynamics) simulations were made on the base of a 3D scanned propeller model. Influence of some geometrical parameters of propeller (like velocity or pitch) and quadcopter (like gap) on lifting force was considered. Different propeller pitches were used and pitch influence on propeller lift force was analysed. Normally, lifting force will increase with the increasing of propeller pitch but for different rotation velocities, this increasing is different and in all cases, it can be approximated by a linear relationship. To obtain dependency functions, an equation for calculation of lift force given took into account the correction coefficients. This equation gave reliable results at pitch values equal to 0.3 -0.7 of the propeller diameter and at rotation velocities of 2000 min -1 -8000 min -1 .Lift force dependency from distance between rotors was also considered. Simulations and experiments showed that the lifting force of a quadcopter increased about 15% on gap distances from 5 mm to 35 mm. From a distance of 70 mm, the lifting force will decrease about 2% and then will stabilise. At increasing of distance between propellers from 5 mm until 25 mm, the power consumption decreased 8% -10% and after the gap distance equal to 40 mm, it will be stable and minimal. It can be asserted that quadcopters have different optimal distances between the propellers at different rotation speeds to generate the same force. Equations for calculation of optimal gap distances for different multicopters were derived and calculation results are presented in graphs and tables.

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Determination of shrinkage of weld

2018

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A calculation-experimental technique of determination of weld shrinkage is described in that work. Experimentally, with the help of strain gauges, residual stresses are determined at two points, which are at known distances from the weld. Shrinkages are found out from the theoretical solution of the plane elasticity theory about the insertion of bodies with interference. Calculations have been carried out for experimental studies of a weld 400 mm long for different thicknesses of metal. It is found that when the thickness of the metal increases, the shrinkage values also increase. This is due to the fact that as the thickness of the metal increases, the heat input required to penetrate it also increases.

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Definition of Locked-up Stresses around a Rectilinear Welding Seam

Cited by 12 publications

References 10 publications

Rational Dimensions of Transverse Stiffenning Ribs in Girders with a Slender Web

Rational Dimensions of Transverse Stiffenning Ribs in Girders with a Slender Web

Analysis and study of the influence of the geometrical parameters of mini unmanned quad-rotor helicopters to optimise energy saving

Determination of shrinkage of weld

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