Experimental Testing and Numerical Analysis of a Barrel Vault

Structures ◽  
2018 ◽  
Vol 15 ◽  
pp. 138-151 ◽  
Author(s):  
Mariella Diaferio ◽  
Marilena Venerito ◽  
Michele Vitti
Keyword(s):  
Numerical Analysis ◽  
Experimental Testing

scholarly journals Numerical analysis and experimental testing of ultra-high performance fibre reinforced concrete keyed dry and epoxy joints in precast segmental bridge girders

2019 ◽  
Vol 11 (4) ◽  
pp. 463-472
Author(s):  
Balamurugan A. Gopal ◽  
Farzad Hejazi ◽  
Milad Hafezolghorani ◽  
Voo Yen Lei
Keyword(s):  
Reinforced Concrete ◽  
Numerical Analysis ◽  
Numerical Model ◽  
High Performance ◽  
Experimental Testing ◽  
Shear Capacity ◽  
Numerical Results ◽  
Fiber Reinforced Concrete ◽  
Shear Behaviour ◽  
Segmental Bridges

Abstract Although ultra-high performance fiber reinforced concrete (UHPFRC) has been used recently as a sustainable construction technique for many precast segmental bridges (PSBs), no exhaustive numerical and experimental studies exist to assess the shear capacity and failure pattern of the joints in these bridges. Hence, to accurately investigate the shear behavior of the joints in UHPFRC precast segmental bridges, a numerical analysis model based on finite-element code was established in this study. Concrete damaged plasticity model was used to analyze the UHPFRC joint models by considering all the geometries, boundaries, interactions and constraints. In this paper, the numerical model was calibrated by two full-scale UHPFRC keyed dry and epoxy joints under confining pressure effect. The excellent agreement between the numerical results and experimental data demonstrated the reliability of the proposed numerical model. The validated numerical model was then utilized to investigate the parameters affecting shear behaviour of the joints in PSBs. For this purpose, 12 FE models were analyzed under different variable parameters namely, number of shear keys, confining stress, and types of joints (dry or epoxy). Furthermore, the numerical results were also compared with the five existing shear design provision models available in literature in terms of ultimate shear capacity.

Kinematic Precision Scaling With Physical Errors in Miniaturization of Four-Bar Polymer Compliant Machines

2006 ◽  
Vol 129 (5) ◽  
pp. 951-960
Author(s):  
R. J. Chang ◽  
Y. L. Wang
Keyword(s):  
Numerical Analysis ◽  
Material Properties ◽  
Compliant Mechanism ◽  
Experimental Testing ◽  
Signal To Noise Ratio ◽  
Kinematic Model ◽  
Experimental Tests ◽  
Signal To Noise ◽  
Compliant Joints ◽  
Noise Ratio

A precision-scaling kinematic model with the effects of physical error is investigated in the miniaturization of four-bar polymer machines with compliant joints. A pseudolinkages model (PLM) for the multiple-links compliant machine is formulated. A scaling formulation of the multiple-links compliant machine and its associated PLM is developed. A method for scaled-up test and scaled-down analysis of the compliant mechanism with the considerations of physical errors of fabrication processes, material properties, and experimental tests is proposed. By defining an index of signal-to-noise ratio, the performance of the miniature realization under physical errors is evaluated. The applications of the scaling PLM for the miniature realization of a compliant machine are illustrated by performing both numerical analysis and experimental testing on four-bar compliant polyethylene machines.

Experimental and Numerical Analysis of Low-Temperature Heat Pipes With Multiple Heat Sources

1991 ◽  
Vol 113 (3) ◽  
pp. 728-734 ◽  
Author(s):  
A. Faghri ◽  
M. Buchko
Keyword(s):  
Numerical Analysis ◽  
Heat Pipe ◽  
Heat Load ◽  
Experimental Testing ◽  
Heat Pipes ◽  
Heat Sources ◽  
Wick Structure ◽  
Energy Equations ◽  
Vapor Region ◽  
Vapor Temperature

A numerical analysis and experimental verification of the effects of heat load distribution on the vapor temperature, wall temperature, and the heat transport capacity for heat pipes with multiple heat sources is presented. A numerical solution of the elliptic conjugate mass, momentum and energy equations in conjunction with the thermodynamic equilibrium relations and appropriate boundary conditions for the vapor region, wick structure, and the heat pipe wall are given. The experimental testing of a copper-water heat pipe with multiple heat sources was also made showing excellent agreement with the numerical results. An optimization of the heat distribution for such heat pipes was performed and it was concluded that by redistribution of the heat load, the heat capacity can be increased.

scholarly journals Resisting Timber Joint Performance of Karo Wooden Building

2020 ◽  
Vol 10 (1) ◽  
pp. 1-5
Author(s):  
Khairussa’diah Khairussa’diah ◽  
Yulianto P. Prihatmaji
Keyword(s):  
Numerical Analysis ◽  
Failure Modes ◽  
Experimental Testing ◽  
Work Load ◽  
Test Results ◽  
Rotational Angle ◽  
Timber Joint ◽  
Wooden House ◽  
North Sumatra ◽  
Foundation Stone

Batak Karo is one of the ethnic group that exists in North Sumatra. Wooden house of Batak Karo called with Siwaluh Jabu. This wooden house has a structure system of pillars on top of stone foundations. This type of foundation is able to improve the performance of the overall structure due to lateral style caused by the earthquake. This research was conducted to know the behaviour of the structure of a wooden Batak Karo home especially the restoration of wooden style joints by comparing the results of a laboratory test, numerical analysis and analysis with SAP2000. Experimental testing in the lab do the test objects as much as 3 pieces. Testing by giving a cyclic load with a capacity of 10 tons in each of the test object to damaged object. Then conduct an evaluation the behavior of the structure consist of failure modes and moment-rotational angle relationship. After the experimental test was completed, the analysis continued with validate test results with laboratory of numerical analysis. Then conducted an analysis of the power structure by using SAP2000 program to know the power of elements against the maximum tension. The analysis conducted on the overall structure of the system and the structure of mast above the foundation stone. The program was conducted with input data: the work load, etc. As the output from these programs is the element force, etc. The final results of this program are the weaknesses and advantages of structural system observed from wooden Batak Karo.

Wrinkling in Sheet Metal Forming: Experimental Testing vs. Numerical Analysis

2003 ◽  
Vol 6 (2) ◽  
pp. 147-160
Author(s):  
A Selman ◽  
Eisso H Atzema ◽  
Timo Meinders ◽  
Anton H van den Boogaard ◽  
J Huetink
Keyword(s):  
Numerical Analysis ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Experimental Testing

scholarly journals Performance Analysis of a Microfluidic Pump Based on Combined Actuation of the Piezoelectric Effect and Liquid Crystal Backflow Effect

Micromachines ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 584 ◽  
Author(s):  
Guan
Keyword(s):  
Liquid Crystal ◽  
Numerical Analysis ◽  
Flow Rate ◽  
Electromechanical Coupling ◽  
Piezoelectric Effect ◽  
Experimental Testing ◽  
Maximum Flow ◽  
Coupling Mechanism ◽  
Glass Wafer ◽  
Driving Mode

A novel combined actuation method based on the piezoelectric effect and liquid crystal backflow effect is proposed in this paper. The coupling mechanism of a piezoelectric transducer (PZT) and liquid crystal (LC) in a combined driving mode is analyzed, and the governing equations of electromechanical coupling based on inverse piezoelectric effect and the classical Leslie–Ericksen backflow equation are modified under combined driving method. The new multifield coupling dynamic equations for numerical analysis is established. Experimentally, a sandwiched micropump was manufactured and sealed with wet etching technology on a glass wafer. A testing platform was built to analyze the particles motion and the flow rates were measured with both single PZT or LC actuation and combined actuation. Comparing the results of the numerical analysis and experimental testing of the flow rate and LC molecule motion under different driving voltages and frequencies, the performance of the PZT/LC combined driving is found to be superior to that of the single driving mode (PZT or LC driving) under the same driving conditions. Moreover, the new combined driving mode overcome the disadvantages of single driving mode and enhance the driving efficiency significantly. The simulation results are in good agreement with the experimental data. The maximum flow rate of the micropump achieved was 4.494 μL/min with combined driving method.

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