Testing and Analysis of a New Lead-Extrusion Damper

2002 ◽  
Author(s):  
C. S. Tsai ◽  
W. S. Lai ◽  
C. W. Chang ◽  
M. C. Li
Keyword(s):  
Laboratory Test ◽  
Hysteresis Loop ◽  
Energy Absorption ◽  
Analytical Model ◽  
Internal Force ◽  
Experimental Results ◽  
Test Results ◽  
Wave Type ◽  
Maximum Capacity ◽  
Good Agreement

The purpose of this study is to test and explore the characteristics of the new lead-extrusion damper (LED), which is manufactured in the department of Civil Engineering of Feng-Chia University. The Stroke of the tested damper is ±10 mm and the maximum movement of the laboratory test is ±5mm, which is provided by the MTS (machine with a maximum capacity of 25tons). The test results have proved that the new LED possesses excellent capability for energy absorption. The hysteresis loop behaves like “plastic solids” or “coulomb dampers”. The internal force and the speed of the movement are correlated while the damper is subjected to sin wave type of loadings. By comparing the numerical results obtained from the proposed analytical model with experimental results under various displacements and frequencies, it is concluded that a good agreement between the computational and experimental results has been achieved.

Experimental Study and Finite Analysis on Flexural Capacity of Laminated Glass

2011 ◽  
Vol 243-249 ◽  
pp. 258-262
Author(s):  
Jun Chen ◽  
Jia Lv ◽  
Qi Lin Zhang ◽  
Zhi Xiong Tao ◽  
Jun Chen
Keyword(s):  
Experimental Results ◽  
Laminated Glass ◽  
Test Results ◽  
Design Code ◽  
Flexural Capacity ◽  
Equivalent Thickness ◽  
High Rise ◽  
Safety Glass ◽  
Current Design ◽  
Good Agreement

Laminated glass has been increasing widely used in high rise buildings as a kind of safety glass in recent years. So we should analyze its material property. In this paper, we use flexural experiments and ANSYS program to analyze the main factors that affect the flexural capacity of the laminated glass. The test results show that the flexural capacity is closely related to film. And the ANSYS program had got good agreement with the experimental results. Comparison of experimental results with calculated ones indicates that the current design code will lead to conservative results and the equivalent thickness of laminated glasses provided in the code should be further discussed.

scholarly journals Assessing the Instantaneous Stiffness of Cracked Reinforced Concrete Beams Based on a Gradual Change in Strain Distributions

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Chunyu Fu ◽  
Dawei Tong ◽  
Yuyang Wang
Keyword(s):  
Experimental Data ◽  
Reinforced Concrete ◽  
Cross Section ◽  
Concrete Beams ◽  
Internal Force ◽  
Experimental Results ◽  
Reinforced Concrete Beams ◽  
Gradual Change ◽  
Concrete Cracking ◽  
Good Agreement

Concrete cracking causes a gradual change in strain distributions along the cross section height of reinforced concrete beams, which will finally affect their instantaneous stiffness. A method for assessing the stiffness is proposed based on the gradual change, which is considered through modeling different strain distributions for key sections in cracked regions. Internal force equilibria are adopted to find a solution to top strains and neutral axes in the models, and then the inertias of the key sections are calculated to assess the beam stiffness. The proposed method has been validated using experimental results obtained from tests on five reinforced concrete beams. The predicted stiffness and displacements are shown to provide a good agreement with experimental data. The instantaneous stiffness is proven to greatly depend on the crack number and depth. This dependence can be exactly reflected by the proposed method through simulating the gradual change in concrete strain distributions.

scholarly journals Validation of the Analytical Model of Oceanic Lidar Returns: Comparisons with Monte Carlo Simulations and Experimental Results

2019 ◽  
Vol 11 (16) ◽  
pp. 1870 ◽  
Author(s):  
Yudi Zhou ◽  
Weibiao Chen ◽  
Xiaoyu Cui ◽  
Aleksey Malinka ◽  
Qun Liu ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Analytical Model ◽  
Oblique Incidence ◽  
Relative Difference ◽  
Experimental Results ◽  
Coefficient Of Determination ◽  
Scattering Approximation ◽  
Angle Scattering ◽  
Mc Simulation ◽  
Good Agreement

The analytical model based on the quasi-single small-angle scattering approximation can efficiently simulate oceanic lidar signals with multiple scattering; thus, its accuracy is of particular interest to scientists. In this paper, the model is modified to include refraction at oblique incidence and is then compared with Monte Carlo (MC) simulations and experimental results. Under different conditions, the results calculated by the analytical model demonstrate good agreement with the MC simulation and experimental data. The coefficient of determination R2 considering the logarithm of signals and the root mean square of the relative difference δ are R2 = 0.998 and δ = 10% in comparison with the semi-analytic MC simulation and R2 = 0.952 and δ = 46% for the lidar experiment. Thus, the results demonstrate the validity of the analytical model in the simulation of oceanic lidar signals.

Ligament Strain in the Human Knee Joint

1970 ◽  
Vol 92 (1) ◽  
pp. 131-136 ◽  
Author(s):  
R. G. Edwards ◽  
J. F. Lafferty ◽  
K. O. Lange
Keyword(s):  
Knee Joint ◽  
Analytical Model ◽  
Experimental Results ◽  
Knee Joints ◽  
Strain Gauges ◽  
Cruciate Ligaments ◽  
Human Knee ◽  
Human Knee Joint ◽  
Ligament Strain ◽  
Good Agreement

The kinematics of the human knee joint and the strain of the ligaments as a function of flexion are determined analytically and experimentally. The experimental results were obtained in 13 tests of four knee joints in which the strain in each of the two collateral and two cruciate ligaments was measured with mercury strain gauges while the tibia was rotated through a flexion angle of 130 deg. The values of the relative ligament strain obtained from the analytical model are in good agreement with the experimental results.

scholarly journals Full-Field Measurements in the Edge Crush Test of a Corrugated Board – Analytical and Numerical Predictive Models

2021 ◽  
Author(s):  
Tomasz Garbowski ◽  
Jakub Krzysztof Grabski ◽  
Aleksander Marek
Keyword(s):  
Analytical Model ◽  
Predictive Models ◽  
Field Measurements ◽  
Experimental Results ◽  
Full Field ◽  
Corrugated Board ◽  
Validation Procedure ◽  
Reliable Design ◽  
Force Displacement ◽  
Good Agreement

The article focuses on derivation of simplified predictive models for identification of overall compressive stiffness and strength of corrugated cardboards. As a representative example an unsymmetrical 5-ply sample (with E and B flute) was used in this study. In order to exclude unreliable displacement measurement in the standard edge crush test, the virtual strain gauges are used. Video extensometry is employed here to collect measurements from the outer surfaces of the sample on both sides. Additional data allows for obtaining real force-displacement curves, which are used in the validation procedure. To emulate the experimental results, beside simple analytical model, also a 3D numerical model fully reflecting the geometry of the corrugated board, based on finite elements method was also built. In both cases a good agreement between the experimental results and the analytical and numerical calculations was observed. This proves that the proposed analytical model can be successfully used to determine the overall stiffness and compressive strength of the corrugated board, provided that the geometry and properties of all the layers of the board are known. The simple model presented in this work enables quick and reliable design and prototyping of new assemblies without the need to manufacture them.

Axial Strength of Concrete-Filled Square Steel Tubular Columns Reinforced by Inner Circular Steel Tube

2010 ◽  
Vol 163-167 ◽  
pp. 4542-4545 ◽  
Author(s):  
Xin Zhong Li ◽  
Xue Ying Wei ◽  
Jun Hai Zhao
Keyword(s):  
Experimental Investigation ◽  
Steel Tube ◽  
Experimental Results ◽  
Test Results ◽  
Strength Theory ◽  
Unified Strength Theory ◽  
Axial Strength ◽  
Tubular Columns ◽  
Circular Steel Tube ◽  
Good Agreement

This paper presents the theoretical and experimental results of concrete-filled steel tube columns subjected to axially compression. A total of 6 specimens with outer square sections reinforced by inner cicular steel tube were constructed for experimental investigation. The ultimate strengths of the columns from tests were obtained. The theoretical strengths of the columns were also investigated based on unified strength theory, and compared with the test results. Good agreement can be observed from the comparison.

A Simple Analytical Model to Simulate Oblique Ballistic Impact onto Fabric

2011 ◽  
Vol 110-116 ◽  
pp. 3453-3458
Author(s):  
Mohamad Ali Akbari ◽  
Golam Hosein Liaghat ◽  
Hadi Sabouri
Keyword(s):  
Experimental Data ◽  
Analytical Model ◽  
Ballistic Impact ◽  
Experimental Results ◽  
Simple Analytical Model ◽  
Good Agreement

A simple analytical model for oblique ballistic impact of projectiles into fabrics are presented. This model is extension of Chocron-Benloulo penetration model. Results are compared with experimental data. There is good agreement between analytical and experimental results.

Dislocation Punching From Ceramic/Metal Interfaces

1994 ◽  
Vol 116 (3) ◽  
pp. 408-413 ◽  
Author(s):  
M. Taya ◽  
T. Mori
Keyword(s):  
Metal Matrix Composite ◽  
Analytical Model ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Composite System ◽  
Filler Metal ◽  
Experimental Results ◽  
Ceramic Filler ◽  
Metal Interfaces ◽  
Good Agreement

Relaxation of misfit strains at interfaces between two different materials by dislocation punching is studied analytically by focusing on two types of interfaces: planar and nonplanar. As an example of planar type interface, the case of metal coating/ ceramic substrate system is studied while ceramic filler/metal matrix composite system is examined as an example of a nonplanar interface. Based on the present analytical model, the condition for dislocation punching for each interface is established. Validity of the dislocation punching model is verified by comparing the analytical results with limited experimental results, resulting in a good agreement.

scholarly journals An Analytical Model for Prediction of Magnetic Flux Leakage from Surface Defects in Ferromagnetic Tubes

2016 ◽  
Vol 16 (1) ◽  
pp. 8-13 ◽  
Author(s):  
V. Suresh ◽  
A. Abudhahir
Keyword(s):  
Magnetic Flux ◽  
Analytical Model ◽  
Surface Defects ◽  
Experimental Results ◽  
Magnetic Flux Leakage ◽  
Analytical Expression ◽  
Cylindrical Holes ◽  
Lift Off ◽  
Flux Leakage ◽  
Good Agreement

Abstract In this paper, an analytical model is proposed to predict magnetic flux leakage (MFL) signals from the surface defects in ferromagnetic tubes. The analytical expression consists of elliptic integrals of first kind based on the magnetic dipole model. The radial (Bz) component of leakage fields is computed from the cylindrical holes in ferromagnetic tubes. The effectiveness of the model has been studied by analyzing MFL signals as a function of the defect parameters and lift-off. The model predicted results are verified with experimental results and a good agreement is observed between the analytical and the experimental results. This analytical expression could be used for quick prediction of MFL signals and also input data for defect reconstructions in inverse MFL problem.

Nuclear Glass Alteration in Clay: Assessment of the Effect of Direct Contact between the Materials through Experimental and Modeling Approach

2003 ◽  
Vol 807 ◽  
Author(s):  
S. Gin ◽  
F. Thierry ◽  
Y. Minet
Keyword(s):  
Laboratory Test ◽  
Direct Contact ◽  
Experimental Results ◽  
Test Results ◽  
New Approach ◽  
Geological Disposal ◽  
Boom Clay ◽  
Modeling Approach ◽  
Laboratory Test Results ◽  
Original Laboratory

ABSTRACTA new approach is proposed for discussing the reliability and predictability of the models intended to evaluate the performance of glass packages under geological disposal conditions. The r(t) model developed by the CEA is used in this study to simulate original laboratory test results, and the validity of the predictions is then verified experimentally. This approach allows us to check that the key mechanisms are correctly simulated, even if they are simplified. A review of the experimental results (glass alteration kinetics and morphology of the alteration film) suggests that physically separating the glass and clay under geological disposal conditions could considerably diminish the silica pump effect attributed to reactive clays such as Boom clay or FoCa7 clay.

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