scholarly journals Force-State Characterization of Struts Using Pinned Joints

1997 ◽  
Vol 4 (2) ◽  
pp. 103-113 ◽  
Author(s):  
Brook D. Ferney ◽  
Steven L. Folkman
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Research Effort ◽  
Element Model ◽  
Mapping Technique ◽  
Model Parameters ◽  
The Finite Element Model ◽  
Pinned Joints

As part of a research effort to study the microgravity dynamics of a truss with pinned joints, a single strut with a single clevis-tang pinned joint was characterized. Experimental data was collected using a force-state mapping technique. The strut was subjected to axial dynamic loads and the response of the strut was measured. The force-state map aids visualization of the strut dynamics. Finite element modeling of the response was explored. An example is presented that uses a method of manual determination of the finite element model parameters. The finite element model results correspond well with the measured strut response.

Dynamic Analysis of a Turbocharger Centrifugal Compressor Impeller

1991 ◽  
Author(s):  
V. Ramamurti ◽  
D. A. Subramani ◽  
K. Sridhara
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Centrifugal Compressor ◽  
Element Model ◽  
Simplified Model ◽  
Cyclic Symmetry ◽  
Compressor Impeller ◽  
Cyclic Symmetric ◽  
The Finite Element Model

Abstract Stress analysis and determination of eigen pairs of a typical turbocharger compressor impeller have been carried out using the concept of cyclic symmetry. A simplified model treating the blade and the hub as isolated elements has also been attempted. The limitations of the simplified model have been brought out. The results of the finite element model using the cyclic symmetric approach have been discussed.

Virtual characterization of nonlocal continuum damage model parameters using a high fidelity finite element model

2021 ◽  
Vol 256 ◽  
pp. 113073
Author(s):  
Johannes Reiner ◽  
Xiaodong Xu ◽  
Navid Zobeiry ◽  
Reza Vaziri ◽  
Stephen R. Hallett ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Damage Model ◽  
Element Model ◽  
Model Parameters ◽  
High Fidelity ◽  
Continuum Damage ◽  
Nonlocal Continuum ◽  
Continuum Damage Model

Numerical Simulation of Z-Shaped Column Joints in RC Frame Based on Damage Plasticity Model

2015 ◽  
Vol 777 ◽  
pp. 173-178
Author(s):  
Zhen Qiang Ni ◽  
Qin Shu Cui
Keyword(s):  
Finite Element ◽  
Cyclic Loading ◽  
Finite Element Model ◽  
Element Model ◽  
Constitutive Relationship ◽  
Physical Model Test ◽  
Model Parameters ◽  
Plasticity Model ◽  
Rc Frame ◽  
The Finite Element Model

This research selected Z-shaped section column joints in RC frame as the investigating object and considered the mechanical parameters extracted from physical model test results, proposed the finite element model of concrete damaged plasticity. Combining concrete damage plasticity model parameters on ABAQUS of concrete constitutive relationship from appendix C of Code for design of concrete structures (GB50010-2010), add the concept of damage factor to Energy equivalence principle, construct finite element model of Z-shaped column joints in RC frame, and simulated the test process under horizontal cyclic loading. The analysis results indicate that the finite element model can perfectly simulate action. It can reflect the mechanical properties of Z-shaped column joints in frame under horizontal cyclic loading, which is proved correct and reliable.

Investigation of the thermal properties of spacer fabrics with bio-ceramic additives using the finite element model and experiment

2016 ◽  
Vol 88 (3) ◽  
pp. 293-311 ◽  
Author(s):  
Rimantas Barauskas ◽  
Audrone Sankauskaite ◽  
Ausra Abraitiene
Keyword(s):  
Heat Transfer ◽  
Finite Element ◽  
Finite Element Model ◽  
Heat Resistance ◽  
Computational Models ◽  
Element Model ◽  
Model Parameters ◽  
Ir Absorption ◽  
Power Flux ◽  
The Finite Element Model

The heat resistance of fabric enhanced by bio-ceramic additives (BCAs) is investigated theoretically and experimentally in order to determine the influence of modification of the infrared (IR) absorption property of the fabric. The enhanced IR sensitivity of textiles improves the thermoregulatory processes when worn in cold environments. The finite element model has been developed by taking into account the coupled phenomena of heat conduction, surface convection and the interaction of the fabric with IR power flux by employing heat transfer differential equations and the Stefan–Boltzmann law. Evaluations of IR absorptivity, reflectivity and transmissivity, the temperature transients during the hot plate chamber test and heat retaining properties of the fabric heated by an IR lamp have been obtained experimentally and simulated by means of the developed finite element model. The values of model parameters have been found, which provided a satisfactory match between the computation and the experiment in all considered cases. Simultaneously, the obtained values were reasonably close to rough theoretical estimations. Efforts have been made to distinguish from each other the influence of diffusive and radiative components of heat transfer, which affect the results of thermal resistance tests. The comparative analysis of contributions of different heat exchange mechanisms allows a better understanding of the peculiarities of standard heat resistance measurement procedures applied to BCA-enhanced fabrics and facilitates the validation of the computational models.

Determination of the Convective Coefficient of Coolant by Comparing the Finite Element Model With the Experimental Results From Surface Grinding

2006 ◽  
Author(s):  
Anand Parthasarathy ◽  
Ian R. Grosse
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Experimental Results ◽  
Surface Grinding ◽  
Work Piece ◽  
Convection Coefficient ◽  
Convective Coefficient ◽  
The Finite Element Model

It is known that coolants play an important role in the grinding operation by reducing the heat that is generated on the work piece. As large amount of specific energy is spent in removing very small amount of the work piece in the finishing operations like grinding, the convective property of coolant plays a significant role in providing the required cooling effect. In today’s world, people have been customizing the coolant used for industry purposes as well as in the area of research. Thus the coolant property becomes an unknown quantity and the convection coefficient of the coolant, which dictates the quantity of heat removed from the workpiece during grinding, determines the coolant’s effectiveness. In this paper the convection coefficient of the coolant was determined for a particular velocity by computing and tuning of finite element model against experimental results. The convective property depends on various parameters such as thermal conductivity, heat capacity among others but in this paper, its dependence on velocity of the coolant is stressed. It was determined from the experimental results of surface grinding operation on workpiece and then comparing them with the finite element model simulated in ANSYS. By varying the convection coefficient parameter, the finite element model was fitted to the experimental results thus resulting in the determination of convective coefficient property of the coolant.

Arched Vaults Made of Corrugated Sheets: Natural Vibration Frequencies

2019 ◽  
pp. 18-24
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Building Structures ◽  
Friction Forces ◽  
Modeling Process ◽  
The Difference ◽  
Russian Norms ◽  
The Finite Element Model

According to the recent Russian norms, when designing building structures, it is necessary to conduct a dynamic analysis of wind loads, which previously was required not in all cases. In arched vaults of profiled arched self-supporting flooring, it was not always necessary to determine the frequencies and forms of natural vibrations. These parameters can be established using the finite element method. Taking into consideration the complex and lengthy modeling process of arched vaults, in particular the contact areas in regular transverse joints, a large number of finite elements in the models and, as a consequence, considerable time for their calculation, it was necessary to identify a sufficient level of detailing of a finite element model for correct calculations of frequencies and forms of vibrations considered in the operation of structures. The influence of the detailing of the finite element model of arched vaults made of profiled flooring on the determination of their natural frequency is revealed. To substantiate the parameters of the finite element model, it was studied how the results of the calculation was influenced by edge effects, the presence of friction in the joints of corrugations of the profiled flooring, the influence of rubber gaskets in the joints on the work of the arched vault. Much attention is paid to the features of the design scheme associated with the choice of the number of sheets of profiled flooring, taking into account the contact nodes, friction forces, etc. It is established that the first vibration frequency is little dependent on the number of sheets of corrugated flooring and the presence of rubber gaskets in the joints. For subsequent frequencies, the difference can be significant.

scholarly journals Experimental and numerical characterization of the interface between concrete masonry block and mortar

2020 ◽  
Vol 13 (3) ◽  
pp. 578-592
Author(s):  
R. D. PASQUANTONIO ◽  
G. A. PARSEKIAN ◽  
F. S. FONSECA ◽  
N. G.SHRIVE
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Physical Models ◽  
The Finite Element Method ◽  
Numerical Characterization ◽  
Tension Tests ◽  
Analytical Research ◽  
The Finite Element Model

Abstract Masonry is a construction system that has been used since the beginning of civilization and is still used throughout the world. The finite element method is a recent development that allows complex problems, including structural masonry problems, to be solved. A vast amount of literature exists on finite element modeling, using software such as ABAQUS, to represent experimental masonry models. Based on this established pattern, an experimental and analytical research program was designed and implemented. Thus, a set of tests was conducted to determine the compressive and tensile strengths of the masonry components, i.e., block, mortar, and grout. Bond wrench tests, diagonal tension tests, and horizontal joint shear tests were conducted to characterize the interface between the blocks and the mortar. A finite element model was then developed to represent the physical models and the general conclusion is that the finite element model was able to represent reasonably well the physical models.

scholarly journals Sensitivity Analysis of the Influence of Structural Parameters on Dynamic Behaviour of Highly Redundant Cable-Stayed Bridges

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
B. Asgari ◽  
S. A. Osman ◽  
A. Adnan
Keyword(s):  
Sensitivity Analysis ◽  
Finite Element ◽  
Finite Element Model ◽  
Model Updating ◽  
Structural Parameters ◽  
Element Model ◽  
Structural Behavior ◽  
Model Tuning ◽  
The Finite Element Model ◽  
Cable Stayed Bridges

The model tuning through sensitivity analysis is a prominent procedure to assess the structural behavior and dynamic characteristics of cable-stayed bridges. Most of the previous sensitivity-based model tuning methods are automatic iterative processes; however, the results of recent studies show that the most reasonable results are achievable by applying the manual methods to update the analytical model of cable-stayed bridges. This paper presents a model updating algorithm for highly redundant cable-stayed bridges that can be used as an iterative manual procedure. The updating parameters are selected through the sensitivity analysis which helps to better understand the structural behavior of the bridge. The finite element model of Tatara Bridge is considered for the numerical studies. The results of the simulations indicate the efficiency and applicability of the presented manual tuning method for updating the finite element model of cable-stayed bridges. The new aspects regarding effective material and structural parameters and model tuning procedure presented in this paper will be useful for analyzing and model updating of cable-stayed bridges.

Biodynamics of Human Thorax With Body Armors Subject to Bullet Impact

2001 ◽  
Author(s):  
Y. W. Kwon ◽  
J. A. Lobuono
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Body Armor ◽  
Projectile Impact ◽  
Human Thorax ◽  
Trachea And Bronchi ◽  
Armor System ◽  
The Finite Element Model

Abstract The objective of this study is to develop a finite element model of the human thorax with a protective body armor system so that the model can adequately determine the thorax’s biodynamical response from a projectile impact. The finite element model of the human thorax consists of the thoracic skeleton, heart, lungs, major arteries, major veins, trachea, and bronchi. The finite element model of the human thorax is validated by comparing the model’s results to experimental data obtained from cadavers wearing a protective body armor system undergoing a projectile impact.

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