Forces at flange–web connections in T-beams

1984 ◽  
Vol 11 (4) ◽  
pp. 943-954 ◽  
Author(s):  
Abdul Ghani Razaqpur ◽  
Amin Ghali
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Beam Theory ◽  
The Other ◽  
The Finite Element Method ◽  
Line Load ◽  
Closed Form Solutions ◽  
Simplified Procedure ◽  
The Web ◽  
Key Words Beams

The flanges of T- and I-beams are subjected, near their junctions with the web, to three in-plane forces: Nx, Ny, and Nxy, where x and y are horizontal axes parallel and normal to the beam axis. The finite element method is used to study the variation of these forces in T-beams under point or line load. It is concluded that forces Nx and Nxy can be determined for design purposes using conventional engineering beam theory. Force Ny, on the other hand, cannot be determined by available closed-form solutions. Based on a detailed parametric study, a simplified procedure is proposed for determining Ny. Key words: beams (supports), connections, finite element, flanges, loads (forces), T-beams, webs (supports).

scholarly journals Influence of the Mechanical Properties of Elastoplastic Materials on the Nanoindentation Loading Response

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4842
Author(s):  
Huanping Yang ◽  
Wei Zhuang ◽  
Wenbin Yan ◽  
Yaomian Wang
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Finite Element ◽  
The Other ◽  
Equivalent Model ◽  
Strain Hardening Exponent ◽  
Mechanical Parameters ◽  
The Finite Element Method ◽  
Fem Simulations ◽  
Elastoplastic Materials

The nanoindentation loading response of elastoplastic materials was simulated by the finite element method (FEM). The influence of the Young’s modulus E, yield stress σy, strain hardening exponent n and Poisson’s ratio ν on the loading response was investigated. Based on an equivalent model, an equation with physical meaning was proposed to quantitatively describe the influence. The calculations agree well with the FEM simulations and experimental results in literature. Comparisons with the predictions using equations in the literature also show the reliability of the proposed equation. The investigations show that the loading curvature C increases with increasing E, σy, n and ν. The increase rates of C with E, σy, n and ν are different for their different influences on the flow stress after yielding. It is also found that the influence of one of the four mechanical parameters on C can be affected by the other mechanical parameters.

Development of Stacked-Type Electrostatic Actuator Using Two Ribbon Films

2013 ◽  
Vol 25 (2) ◽  
pp. 324-332 ◽  
Author(s):  
Kazuo Okuda ◽  
◽  
Keiji Saneyoshi ◽  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Reduction Rate ◽  
Measured Data ◽  
The Other ◽  
Artificial Muscles ◽  
Electrostatic Actuator ◽  
The Finite Element Method ◽  
Nonlinear Structural Analysis ◽  
Working Region

A new stacked-type electrostatic actuator with two ribbon films has been developed to be applied to artificial muscles. In this paper, spring characteristics of the actuator have been simulated and compared to measured data. There are two regions in spring characteristics of the actuator: one is the working region where the actuator contracts easily, and the other is the overload region where the actuator is extended only negligibly by the load. Spring characteristics of the actuator have been simulated by nonlinear structural analysis including the contact problem using the finite element method. It is understood that spring characteristics of working and overload regions can be improved by thinning the hinge and by thickening the electrode. The stroke of the actuator can be controlled, furthermore, by changing the length of the hinge. When the size of the actuator is reduced and actuators are integrated until they become the same volume, voltage applied to the actuator to generate the same force is reduced in proportion to the reduction rate while the actuator keeps the same spring characteristics and stroke.

In-Plane Free Vibration of Curved Beams Using Finite Element Method

2007 ◽  
Author(s):  
F. Yang ◽  
R. Sedaghati ◽  
E. Esmailzadeh
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Equations Of Motion ◽  
Beam Theory ◽  
Central Line ◽  
Circular Ring ◽  
Curved Beam ◽  
The Finite Element Method ◽  
Curved Beams ◽  
Element Method

Curved beam-type structures have many applications in engineering area. Due to the initial curvature of the central line, it is complicated to develop and solve the equations of motion by taking into account the extensibility of the curve axis and the influences of the shear deformation and the rotary inertia. In this study the finite element method is utilized to study the curved beam with arbitrary geometry. The curved beam is modeled using the Timoshenko beam theory and the circular ring model. The governing equation of motion is derived using the Extended-Hamilton principle and numerically solved by the finite element method. A parametric sensitive study for the natural frequencies has been performed and compared with those reported in the literature in order to demonstrate the accuracy of the analysis.

Modeling of tensile and bending properties of biaxial weft knitted composites

2015 ◽  
Vol 22 (3) ◽  
pp. 303-313 ◽  
Author(s):  
Ozgur Demircan ◽  
Shinsuke Ashibe ◽  
Tatsuya Kosui ◽  
Asami Nakai
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Beam Theory ◽  
Experimental Results ◽  
Composite Panel ◽  
The Finite Element Method ◽  
Bending Properties ◽  
Bending Modulus ◽  
Laminate Beam ◽  
Good Agreement

AbstractWithin the scope of experiments, the effect of aramid and glass yarns as stitch and biaxial (warp and weft) yarns in the biaxial weft knitted (BWK) composite was compared. After production of four types of composite panel using the hand lay-up method, the tensile and bending properties of the BWK composites were investigated both experimentally and numerically. The composite with the glass stitch and biaxial yarns exhibited higher tensile and bending properties than did the composite with the aramid stitch and biaxial yarns. The good agreement between the experimental results and the numerical results validated the applicability of the finite-element method for the BWK composites. The laminate beam theory was utilized as another modeling method for calculation of the bending modulus.

scholarly journals The Assessment of the Residual Stresses Influence on Generation of the Infringement in Shape-Complex Supporting Members

2019 ◽  
Vol 69 (1) ◽  
pp. 85-96
Author(s):  
Miroslav Pástor ◽  
Peter Čarák ◽  
Imrich Gömöry
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Numerical Modeling ◽  
Residual Stresses ◽  
The Other ◽  
Drilling Machine ◽  
The Finite Element Method ◽  
Drilling Method ◽  
Measured Residual Stress

AbstractThe aim of the paper is to assess the effect of residual stresses on the damage of the slide bearer. To quantify the residual stresses, the drilling method using SINT MTS 3000 drilling machine was chosen. The tensometric rosette application areas were determined based on the analysis of the results obtained by numerical modeling using the finite element method. Experimental measurement was performed on one unused slide bearer and on the other one, which during its present operation had completed about 9.106cycles. At the end of the paper, the analysis of the measured residual stress values in chosen locations is presented.

scholarly journals Strength Analysis of a Steel Structure of Weights Boxes by Means of Simulation Computations

2017 ◽  
Vol 8 (1) ◽  
pp. 11-19
Author(s):  
Miroslav Blatnický ◽  
Ján Dižo ◽  
Stasys Steišūnas
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Total Mass ◽  
Mass Measurement ◽  
Steel Structure ◽  
Theory Of Elasticity ◽  
The Other ◽  
Strength Analysis ◽  
The Finite Element Method ◽  
Welded Steel

Abstract In this article the strength analyses of weights boxes are presented. Boxes are designed as a welded steel structure at which weights with total mass almost ten tons are stored in them. These boxes are an integral part of a mechanism intended for calibration of the mass measurement device. The article contains on one hand the basic scope of the theory of elasticity and strength analysis and on the other hand the numerical computations of the structure by using the Finite Element Method. Based on results the structure of weights boxes was modified in order to satisfy the defined safety factor.

Production of a Helicopter Tail Boom and Associated Mechanical Tests

2012 ◽  
Vol 445 ◽  
pp. 566-570
Author(s):  
Deniz Kavrar ◽  
M. Lutfy Öveçoğlu ◽  
Halit S. Türkmen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Composite Structure ◽  
Mechanical Tests ◽  
The Other ◽  
Structural Performance ◽  
Pitching Moment ◽  
Main Rotor ◽  
The Finite Element Method ◽  
Materials Used

The lightweight materials such as composites are often used for the aerospace structures. One of the uses of these materials is for the tail boom of helicopters. Tail booms are the structures connecting the tail rotor to the fuselage. It is mainly subjected to the pitching moment and torsion. Because it is long to obtain the enough distance between the tail rotor and the main rotor, the materials used for manufacturing the tail boom needs to be a lightweight material. The structural optimization of the tail boom is also necessary. In this study, two different tail booms are manufactured by using laminated composites. The tail booms considered in this study are a semi-monocoque structure consisted of skins and stiffeners. These skins and stiffeners are made of carbon/epoxy. One is produced by using 3-ply carbon/epoxy and it is strengthened using stiffeners. The other is produced by using honeycomb between 2-layers of carbon/epoxy. A hand lay-up technique is used for the manufacturing of the tail booms. The vacuum bagging and a moderate heat are used to cure the composite structure. The bending and bending with torsion tests are performed to determine the structural performance of the tail booms. The tail boom is also modeled using the finite element method and analyses are performed. The results are presented and discussed.

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