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2 edition of Experimental techniques for analysis of transverse impact on beams found in the catalog.

Experimental techniques for analysis of transverse impact on beams

by Thomas Herbert Berns

  • 344 Want to read
  • 40 Currently reading

Published by Naval Postgraduate School in Monterey, California .
Written in English

    Subjects:
  • Mechanical engineering

  • ID Numbers
    Open LibraryOL25127972M

      1. Introduction. Incorporation of continuous spiral reinforcement in circular cross section components such as beams and columns of RC structures could improve the strength, ductility, and energy dissipation capacity of such structural members [1–3].The first application of spiral reinforcement as the shear reinforcement to increase the axial behaviour of reinforced columns was first.   The RC beam specimens used in the experiment comprised of under-reinforced sections provided with sufficient amount of transverse reinforcements to allow for an overall flexural failure. The experimental impact responses of the RC beams were simulated with two-degree-of-freedom mass-spring-damper system model, in which the loading rate effects.

    The paper presents a review on large deflection behavior of curved beams, as manifested through the responses under static loading. The term large deflection behavior refers to the inherent nonlinearity present in the analysis of such beam system response. The analysis leads to the field of geometric nonlinearity, in which equation of equilibrium is generally written in deformed configuration. Fig. 2. Photograph of the fixation of the beam to a vertical stand rod by means of a multi-clamp using two small metallic pieces. Fig. 3. Experimental measurement of the elastica of the cantilever beam as well as of the vertical displacement of the free end, y. Numerical and Experimental Analysis of a Cantilever Beam .

    Transverse and longitudinal characterization of electron beams using interaction with optical near-fields MARTIN KOZÁK, 1,* JOSHUA MCNEUR, KENNETH J. LEEDLE,2 HUIYANG DENG,2 NORBERT SCHÖNENBERGER,1 AXEL RUEHL,3 INGMAR HARTL,3 HEINAR HOOGLAND,1,4 RONALD HOLZWARTH,4 JAMES S. HARRIS,2,5 ROBERT L. BYER,2 PETER HOMMELHOFF1,6 .   A continuous model for the transverse vibrations of cracked beams including the effect of shear deformation is derived. Partial differential equations of motion and associated boundary conditions are obtained via the Hu-Washizu-Barr variational principle, which allows simultaneous and independent assumptions on the displacement, stress and strain fields.


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Experimental techniques for analysis of transverse impact on beams by Thomas Herbert Berns Download PDF EPUB FB2

Theentiretestrig(beam,knifeedges,androllermechanism)was bolted to a massivewide-flangesupport am, bolted down, provided a solidfoundation and ensured thatthetwo ends ofthetest.

The tests of several scientific workers have shown that the central maximum loading by transverse impact on beams is independent of the boundary conditions. In this case, the length of the beam is so long that the elastic waves reflected from the supports return to the point of contact after the central peak stress has developed.

Now, by these conditions it is possible to simplify the integral Cited by:   In the literature, Kamble et al. [] studied two different materials for a straight beam with a fixed stationary load on the opposite l frequencies in different modes obtained from experimental and analytical results are presented.

Chogule et al. [] experimentally obtained the natural frequency, mode structure, damping and mode shapes of a beam with a fixed rectangular by: 4. The experimental analysis carried out followed ASTM D, where the specimen is parallel-loaded by two steel-based plates.

Three stacking sequences have been evaluated. INTRODUCTION The transverse impact of beams has long been a problem of theoretical and practical interest in applied mechanics research.

In two recent investigations of beam impact, Keer and Lee [1] and Schonberg et al. [2] have developed a theoretical model that can be used to determine the response of finite beams to low velocity impact by: 2. Calculation of the equivalent structure (or system) mass at the contact/impact structure section, m ≈ ρAL/2, where ρ is the specific mass, A is the transverse area and L is the beam length.

Calculation of the critical time step Δ t (from (7)). Experimental and theoretical investigations have been conducted to study the transverse vibrations Experimental techniques for analysis of transverse impact on beams book a beam having nonlinear constraint.

One end of the beam is fixed while the other is supported on a bilinear spring and carries a concentrated mass.

Free-vibration curves, obtained for different values of the spring constants and the end mass, indicate that free periodic vibrations with. In addition, the effect of the test parameters on composite beams was also compared and analyzed.

Based on the experimental results and open literature, a formula was proposed to evaluate the longitudinal shear resistance of SCC beams with longitudinal double-row studs. Experimental program Beam test Specimen details. The objective of experimental modal analysis of beam is to deduce natural frequencies up to the third mode and observe the system response subjected to small initial disturbance.

The developed model was found to give good predictions for CFRP-strengthened RC beams under impact; where numerical-to-experimental difference was % for maximum impact force, % for maximum deflection (Δ max), and for impact duration. The model was also able to accurately simulate CFRP rupture, debonding, and crack patterns.

Abstract. Experimental results of peak- tensile stress for simply supported beams of mild- steel, aluminum, PMMA, araldite and urethane rubber subjected to low velocity impact for the same beam- striker weight ratio have been compared with interesting correspondence with.

A theoretical and experimental approach to an investigation of transient loading and deformation of composite beams and plates was developed for the purpose of creating structures best resisting impact loading. The problem of transverse impact on beams and plates is formulated and solved on the basis of the finite-element method with the use of Timoshenko's shear theory and finite-difference.

Transverse impact of free–free square aluminum beams: An experimental–numerical investigation. Transverse Strength of Rectangular Bars of Wrought-iron. Transverse Strength of Bars previously bent and straightened. Transverse Strength of a Slab of Slate from the Penrhyn Quarries.

Transverse Strength of Timber. Experiments on the Resistance of Beams to Impact. Experiments on the Effect of repeated Impact on Beams. The spectral element method, which is very suitable for solving inverse dynamic problems, is combined with a stochastic genetic algorithm to give a scheme that can locate and size cracks in structural components.

The mechanical model is based on an approach that separates the global structural dynamics from the local crack-tip zone dominated by singular stresses. Fujikake et al [5] examined the impact responses of reinforced concrete RC beams through an experimental study and presents an analytical model developed to.

In this paper the problem of transverse impact on a uniform beam is considered theoretically. Two examples which can be taken as representing a wide range of impacts which occur in practice are referred to particularly: (1) the beam struck transversely by a uniform square-ended rod travelling perpendicularly to it; (2) the same problem for the striker having a spherical end.

In addition to a brief survey of classical work related to impact, this article covers publications related to experimental studies of longitudinal and flexural elastic waves due to impact. This includes the longitudinal, central as well as eccentric impact and transverse impact of two bars and the impact achieved by sphere impinging on a beam.

@article{osti_, title = {Transverse beam stability measurement and analysis for the SNS accumulator ring}, author = {Xie, Zaipeng and Deibele, Craig and Schulte, Michael J. and Hu, Yu-Hen}, abstractNote = {}, doi = {/}, journal. The second technique interferes the 1st order beams with each other and employs an acousto-optic frequency shifter on the +1st order beam to create a heterodyne transverse velocimeter.

For both interferometer techniques, the 0th order beam is interfered in a heterodyne photonic Doppler velocimetry arrangement to obtain a measurement of the. This paper reports the experimental results from a study of the shear behavior of 65 MPa ( psi) concrete beams, reinforced in the transverse and longitudinal directions.

A total of 11 test.The analysis is done on the cantilever beam by attaching some mass and without mass at its free end that relates to many real-life examples such as wings of Aeroplane, towers, buildings etc.With Dynamic Vibration Absorbers: Experimental Analysis M.H. Zainulabidin, N.

Jaini Abstract-In this paper the transverse vibration of a fixed fixed end solutionbeam attached with dynamic vibration absorbers (DVA) has been analyzed experimentally.

The DVA is composed of a flexible beam with two masses symmetrically.