Analysis of Modified Bolotin Method on maximum deflection of three stiffeners plates

The design, fabrication, and testing of a novel bidirectional magnetic microactuator were presented in the paper. The microactuator is composed of an integrated planar coil and a flexible polydimethyl siloxane (PDMS) diaphragm with embedded CoNiMnP-based permanent magnet arrays. There is a 7 × 7 array of magnets in a unit. The PDMS diaphragm is 2 mm × mm × 40 μm and the magnet post is 50 × 50 × 20 μm. Computer simulation was applied to verify the geometrical parameters. Electroplating under external magnetic field is carried out to improve the magnetic properties of the electroplated magnet, including coercivity, remanence and magnetic energy, and so on. The measured maximum coercivity, remanence and maximum magnetic energy were 2623 Oe (208.73 kA/m), 0.2 T (2000 G), and 10.15 kJ/m3 with the magnetic post, respectively. Moreover, and the deflection of the PDMS membrane is proportional to the exciting current. In a case of 0.35 A current, the maximum deflection of the membrane is 45 μm. Adjusting the electroplating mould results in the variation of the electroplated structure, thus the calibration of the microactuator. Due to the biomedical compatibility and simplicity of the fabrication, the flexible membrane-based microactuator is potential to be used as micropump and optical switch, the microelectromechanical system applications.

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Characteristics of Stress Distribution of Micro-Cantilever of Polycrystalline Copper at the Pull-in Voltage

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.300-301.1309 ◽

2013 ◽

Vol 300-301 ◽

pp. 1309-1312

Author(s):

Ji Long Su ◽

Yan Jiao Zhang ◽

Xing Feng Lian

Keyword(s):

Stress Distribution ◽

Cantilever Beam ◽

Electrostatic Force ◽

Polycrystalline Copper ◽

Maximum Deflection ◽

Micro Cantilever ◽

Fixed End ◽

The Relationship

The Ansys simulate software is utilized to analyze pull-in voltages and stresses of the fixed end of micro- cantilever beam with different thicknesses respectively. Based on the analysis of the electrostatic force at the pull-in voltage, the stress of fixed end of micro-beam and the maximum deflection are obtained. The relationship between the stress of fixed end and thickness is established. The results show that the mutation thickness of the stress and the pull-in voltage are at and respectively , it is consistent with the intrinsic size of the polycrystalline copper micro-beam.

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Computational predictions for predicting the performance of steel 1 panel shear wall under explosive loads

Engineering Computations ◽

10.1108/ec-09-2020-0492 ◽

2021 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Aydin Shishegaran ◽

Behnam Karami ◽

Elham Safari Danalou ◽

Hesam Varaee ◽

Timon Rabczuk

Keyword(s):

Steel Plate ◽

Plate Thickness ◽

Ensemble Model ◽

Maximum Deflection ◽

Explosive Load ◽

Statistical Parameters ◽

Content Type ◽

A Value ◽

Error Terms ◽

Better Than

Purpose The resistance of steel plate shear walls (SPSW) under explosive loads is evaluated using nonlinear FE analysis and surrogate methods. This study uses the conventional weapons effect program (CONWEP) model for the explosive load and the Johnson-Cook model for the steel plate. Based on the Taguchi method, 25 samples out of 100 samples are selected for a parametric study where we predict the damaged zones and the maximum deflection of SPSWs under explosive loads. Then, this study uses a multiple linear regression (MLR), multiple Ln equation regression (MLnER), gene expression programming (GEP), adaptive network-based fuzzy inference (ANFIS) and an ensemble model to predict the maximum detection of SPSWs. Several statistical parameters and error terms are used to evaluate the accuracy of the different surrogate models. The results show that the cross-section in the y-direction and the plate thickness have the most significant effects on the maximum deflection of SPSWs. The results also show that the maximum deflection is related to the scaled distance, i.e. for a value of 0.383. The ensemble model performs better than all other models for predicting the maximum deflection of SPSWs under explosive loads. Design/methodology/approach The SPSW under explosive loads is evaluated using nonlinear FE analysis and surrogate methods. This study uses the CONWEP model for the explosive load and the Johnson-Cook model for the steel plate. Based on the Taguchi method, 25 samples out of 100 samples are selected for a parametric study where we predict the damaged zones and the maximum deflection of SPSWs under explosive loads. Then, this study uses a MLR, MLnER, GEP, ANFIS and an ensemble model to predict the maximum detection of SPSWs. Several statistical parameters and error terms are used to evaluate the accuracy of the different surrogate models. The results show that the cross-section in the y-direction and the plate thickness have the most significant effects on the maximum deflection of SPSWs. The results also show that the maximum deflection is related to the scaled distance, i.e. for a value of 0.383. The ensemble model performs better than all other models for predicting the maximum deflection of SPSWs under explosive loads. Findings The resistance of SPSW under explosive loads is evaluated using nonlinear FE analysis and surrogate methods. This study uses the CONWEP model for the explosive load and the Johnson-Cook model for the steel plate. Based on the Taguchi method, 25 samples out of 100 samples are selected for a parametric study where we predict the damaged zones and the maximum deflection of SPSWs under explosive loads. Then, this study uses a MLR, MLnER, GEP, ANFIS and an ensemble model to predict the maximum detection of SPSWs. Several statistical parameters and error terms are used to evaluate the accuracy of the different surrogate models. The results show that the cross-section in the y-direction and the plate thickness have the most significant effects on the maximum deflection of SPSWs. The results also show that the maximum deflection is related to the scaled distance, i.e. for a value of 0.383. The ensemble model performs better than all other models for predicting the maximum deflection of SPSWs under explosive loads. Originality/value The resistance of SPSW under explosive loads is evaluated using nonlinear FE analysis and surrogate methods. This study uses the CONWEP model for the explosive load and the Johnson-Cook model for the steel plate. Based on the Taguchi method, 25 samples out of 100 samples are selected for a parametric study where we predict the damaged zones and the maximum deflection of SPSWs under explosive loads. Then, this study uses a MLR, MLnER, GEP, ANFIS and an ensemble model to predict the maximum detection of SPSWs. Several statistical parameters and error terms are used to evaluate the accuracy of the different surrogate models. The results show that the cross-section in the y-direction and the plate thickness have the most significant effects on the maximum deflection of SPSWs. The results also show that the maximum deflection is related to the scaled distance, i.e. for a value of 0.383. The ensemble model performs better than all other models for predicting the maximum deflection of SPSWs under explosive loads.

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Maximum deflection of symmetric wall-frame buildings

Periodica Polytechnica Civil Engineering ◽

10.3311/ppci.7172 ◽

2013 ◽

Vol 57 (2) ◽

pp. 173

Author(s):

Károly A. Zalka

Keyword(s):

Maximum Deflection ◽

Frame Buildings

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Buckling of a viscous strut loaded eccentrically

Journal of Strain Analysis ◽

10.1243/03093247v094227 ◽

1974 ◽

Vol 9 (4) ◽

pp. 227-229 ◽

Cited By ~ 3

Author(s):

J P Ellington

Keyword(s):

Trigonometric Series ◽

Series Solution ◽

Maximum Deflection ◽

Rapid Convergence ◽

Poor Convergence

A solution to the problem of buckling of a viscous strut with eccentrically applied end loads has been found previously as an infinite trigonometric series having poor convergence for small values of time. An alternative series solution has been found, using powers rather than exponentials of time, which provides not only rapid convergence but simple closed forms for bounds on the maximum deflection.

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A Study of Energy Requirements for Electric Discharge Metal Forming

Journal of Engineering for Industry ◽

10.1115/1.3670468 ◽

1964 ◽

Vol 86 (2) ◽

pp. 127-132

Author(s):

R. L. Kegg

Keyword(s):

Sheet Metal ◽

Experimental Research ◽

Electric Discharge ◽

Research Program ◽

Metal Forming ◽

Explosion Energy ◽

Energy Requirements ◽

Maximum Deflection ◽

Forming Process ◽

Metal Diaphragm

A discussion of the fundamentals of the process of underwater electric discharge forming of metals is presented. The deformation of a sheet-metal diaphragm blast gauge is used as a measure of the amount of forming achievable in an experimental research program aimed at determining the effects of major variables on the performance of the electric discharge forming process. The behavior of the diaphragm gauge during forming is analyzed and an equation derived for predicting its maximum deflection when exposed to a given explosion. The predicted dependence of gauge deflection on gauge diameter, thickness, strength and density, and on explosion energy and standoff distance is confirmed by experiment. The application of these results to other forming operations is discussed.

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LENDUTAN STRUKTUR TWIN BOOM PESAWAT TERBANG NIR AWAK LSU-05 PADA SAAT MENERIMA BEBAN TERBANG (DEFLECTION OF LSU-05 UAV TWIN BOOM STRUCTURE ON RECIEVING THE FLIGHT LOAD)

Jurnal Teknologi Dirgantara ◽

10.30536/j.jtd.2016.v14.a2386 ◽

2017 ◽

Vol 14 (2) ◽

pp. 91

Author(s):

Atik Bintoro

Keyword(s):

Composite Materials ◽

Safety Factor ◽

Analytical Methods ◽

Maximum Velocity ◽

Maximum Deflection ◽

Severe Damage ◽

Glass Composite ◽

Technology Center

The twin-boom structure is a component of LSU-5 unmanned aireal vehicle (UAV) construction wich was produced by Aeronautic Technology Center of LAPAN. This structure serves as a stabilizer UAV movements. In operations, the structure will recieve flight load which could result as the structure deflection. Through analytical methods involving the mission, dimensions and configuration of the structure of the twin-boom LSU 05 UAV, has done research to determine the extent of the ability of the structure in the fligth load, so the resulting deflection. From this research it was known that at flighting during 130 minutes, starting from take off the beginning of the flight until cruising with maximum velocity in 130 km/h, the maximum deflection that occurred in the structure only reaches 5.593 x 10-6 m, with a safety factor of 1.3, it’s means that the structure was relatively save. While at the landing on a relatively save was velocity below 14 km/h. If landing at the velocity exceeding 20 km/h can be believed that the twin-boom structure suffered severe damage, because the stress occurs already exceeded from 650 MPa as the yield strenght of e-glass composite materials. Abstrak:Struktur twin boom merupakan salah satu komponen konstruksi pesawat terbang nir awak LSU-05 hasil karya Pusat Teknologi Penerbangan - LAPAN. Struktur ini berfungsi sebagai penyetabil gerakan pesawat. Dalam operasionalnya, struktur menerima beban terbang yang dapat mengakibatkan timbulnya lendutan. Melalui metode analitis yang melibatkan misi, dimensi dan konfigurasi struktur twin boom pesawat LSU-05, telah dilakukan penelitian untuk mengetahui sejauh mana kemampuan struktur dalam menerima beban terbang, sehingga mengakibatkan lendutan tersebut. Dari penelitian ini diketahui bahwa pada saat penerbangan, selama 130 menit mulai dari tinggal landas di awal penerbangan sampai dengan terbang jelajah pada kecepatan maksimal 130 km/jam, lendutan maksimal yang terjadi pada struktur hanya mencapai 5,593 x 10-6 m, dengan faktor keamanan sebesar 1,3 berarti struktur relatif aman. Sedangkan untuk pendaratan, kecepatan yang relatif aman dapat dilakukan di bawah 14 km/jam. Jika mendarat pada kecepatan melebihi 20 km/jam, struktur twin boom tersebut mengalami kerusakan parah, karena tegangan yang terjadi sudah melebihi 650 MPa sebagai tegangan ijin bahan struktur yakni komposit e-glass.

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Surrounding Rock Movement of Steeply Dipping Coal Seam Using Backfill Mining

Shock and Vibration ◽

10.1155/2021/5574563 ◽

2021 ◽

Vol 2021 ◽

pp. 1-17

Author(s):

Wenyu Lv ◽

Kai Guo ◽

Jianhao Yu ◽

Xufeng Du ◽

Kun Feng

Keyword(s):

Numerical Simulation ◽

Coal Seam ◽

Surrounding Rock ◽

Maximum Deflection ◽

Coal Seams ◽

Physical Similarity ◽

Working Face ◽

Rock Structure ◽

Backfill Mining ◽

The Stability

The movement of the overlying strata in steeply dipping coal seams is complex, and the deformation of roof rock beam is obvious. In general, the backfill mining method can improve the stability of the surrounding rock effectively. In this study, the 645 working face of the tested mine is used as a prototype to establish the mechanical model of the inclined roof beam using the sloping flexible shield support backfilling method in a steeply dipping coal seam, and the deflection equation is derived to obtain the roof damage structure and the maximum deflection position of the roof beam. Finally, numerical simulation and physical similarity simulation experiments are carried out to study the stability of the surrounding rock structure under backfilling mining in steeply dipping coal seams. The results show the following: (1) With the support of the gangue filling body, the inclined roof beam has smaller roof subsidence, and the maximum deflection position moves to the upper part of working face. (2) With the increase of the stope height, the stress and displacement field of the surrounding rock using the backfilling method show an asymmetrical distribution, the movement, deformation, and failure increase slowly, and the increase of the strain is relatively stable. Compared with the caving method, the range and degree of the surrounding rock disturbed by the mining stress are lower. The results of numerical simulation and physical similarity simulation experiment are generally consistent with the theoretically derived results. Overall, this study can provide theoretical basis for the safe and efficient production of steeply dipping coal seams.

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TRANSVERSE BENDING AND FREE VIBRATIONS OF ELASTIC ISOTROPIC PLATES IN THE FORM OF ISOSCELES TRIANGLES

Building and reconstruction ◽

10.33979/2073-7416-2021-98-6-20-27 ◽

2021 ◽

Vol 98 (6) ◽

pp. 20-27

Author(s):

А.V. KOROBKO ◽

◽

N.G. KALASHNIKOVA ◽

Е.G. ABASHIN ◽

◽

...

Keyword(s):

Form Factor ◽

Free Vibrations ◽

Arbitrary Form ◽

Maximum Deflection ◽

Isotropic Plates ◽

Unloaded State ◽

Theory Of Plates ◽

Technical Theory ◽

Hinged Support ◽

Isosceles Triangles

This paper considers elastic isotropic plates in the form of isosceles triangles with combined boundary conditions (a combination of hinged support and rigid restraint conditions along the sides of the contour). Calculations were performed using FEM to determine the integral physical characteristics in the considered problems F (the maximum deflection of uniformly loaded plates w0 and the fundamental frequency of oscillations in the unloaded state ω). On the basis of the obtained numerical results, approximating functions have been constructed: "maximum deflection - form factor of plates", "basic frequency of oscillations - form factor of plates", the structure of which corresponds to the structure of similar formulas obtained when presenting known exact solutions in the corresponding problems of technical theory of plates in isoperimetric form. Based on the properties of the form factor of plates, these approximating functions limit the whole set of considered integral physical quantities and therefore can be used as reference solutions for the calculation of triangular plates of arbitrary form applying the method of interpolation by form factor (MIFF). We consider an example of calculation of a plate in the form of a rectangular triangle with hinged support of the sides.

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