A Comparative Multifield FEA and Experimental Study on the Enhanced Manufacturability of 6061-T6511 Aluminum Using dc Current

2009 ◽  
Vol 131 (6) ◽  
Author(s):  
Amir Khalilollahi ◽  
David H. Johnson ◽  
John T. Roth
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Tensile Specimen ◽  
Transient Temperature ◽  
Stress Strain ◽  
Strain Behavior ◽  
Deformation Force ◽  
Property Changes ◽  
Dc Current

An electric current, applied during deformation, has been shown to reduce the deformation force/energy, while also increasing the maximum achievable strain and decreasing springback. Considering this, the present work initiates the development of a finite element model to investigate electricity’s thermal/structural effects on a tensile specimen. The model allows the effect of joule-heating to be separated from other nonthermal property changes caused by the electricity. Comparison with experimental tensile testing with respect to the predicted stress-strain behavior and transient temperature profiles demonstrates the model predicts these behaviors adequately. A multifield large deformation finite element model is then developed. The model evaluates the stress-strain characteristics of the material while the specimen is carrying a large dc current and is being deformed, incorporating the effect of thermal softening. The simulation results are compared with surface infrared temperature measurements in order to verify the finite element model and then to actual deformation results in order to attain more qualitative and quantitative insight into the effects of the electric field.

Multi-Field FE Modeling of Resistive Heating in a 6061-T6511 Aluminum Specimen

2006 ◽  
Author(s):  
Amir Khalilollahi ◽  
David H. Johnson ◽  
John Roth
Keyword(s):  
Finite Element ◽  
Mechanical Energy ◽  
Element Model ◽  
Tensile Specimen ◽  
Effect Of Temperature ◽  
Transient Temperature ◽  
Fe Model ◽  
Stress Strain ◽  
Aluminum Specimen ◽  
Property Changes

Electric current's effect on material mechanical properties has been of interest since it can lessen the mechanical energy associated with deforming/working a material. The objective of this work is to have a representative model of the thermal/structural effects of electricity on a tensile specimen so that the simple effect of temperature can be separated from any mechanical material property changes due to the electric current. The finite element models in this study were generated and their results were compared to experimental data obtained from a representative tensile test. Comparison with the experimental results on material engineering stress-strain curves and transient temperature profiles offers assurance for the further use of FEA as a significant tool in understanding the electrical effects on material properties. A multi-field large deformation finite element model for a cylindrical tensile bar of 6061-T6511 aluminum is developed to evaluate the distribution of temperature within the specimen. The model also evaluates the stress-strain characteristics of the material while the specimen is carrying a large DC current and being deformed. The simulation results are compared to surface infrared temperature measurements in order to verify the FE model first and then to attain more qualitative and possibly quantitative insight into the effects of electric field.

scholarly journals Experimental Investigation and FEM Modeling of Glued Timber Connections with Slotted-In Steel Plates

2019 ◽  
Vol 27 (4) ◽  
pp. 18-23
Author(s):  
Svitlana Shekhorkina ◽  
Alexander Kesariisky ◽  
Mykola Makhinko ◽  
Tetiana Nikiforova ◽  
Oleksandr Savytskyi
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Element Model ◽  
Steel Plates ◽  
Small Scale ◽  
Fem Modeling ◽  
Stress Strain ◽  
Strain Behavior ◽  
Dowel Connections

Abstract The study is focused on the mechanical behavior and finite element method (FEM) modeling of glued timber dowel connections with slotted-in steel plates. Standard tests accompanied by a physical optics investigation method were used in order to obtain information about the mechanical properties and stress-strain behavior of glued timber dowel connections with slotted-in steel plates. As such a methodology provides information on the stress-strain state over the surface of a connection, it was used as a verification criterion for a 3D finite-element model. Small-scale glued timber dowel connections with slotted-in steel plates were tested in parallel-to-grain tension to investigate their load-carrying capacity and the load-slip performance of the connection. A three-dimensional finite-element model of the glued timber dowel connections with slotted-in steel plates was developed using existing FE software and verified using the holographic interferograms obtained during step-by-step loading as well as the test results.

scholarly journals On the issue of dynamic loading of supporting structures of special wheeled chassis

2019 ◽  
pp. 73-83
Author(s):  
V. I. Tarichko ◽  
P. I. Shalupina
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Dynamic Loading ◽  
Strain State ◽  
Element Model ◽  
Stress Strain ◽  
Full Size ◽  
Equivalent Stresses ◽  
Stress Strain State ◽  
Supporting Structures

The paper focuses on a method for assessing the dynamic loading of the frame of a special wheeled chassis when it moves on roads of various categories. Based on the developed finite element model of the frame, we obtained and analyzed full-size patterns of the stress-strain state of the frame and oscillograms of equivalent stresses in the most loaded zones of the frame.

scholarly journals STRESS-STRAIN STATE OF FRAME STRUCTURES AT THE DIFFERENT SNOW PRESSURE

2019 ◽  
Vol 7 (2) ◽  
pp. 5-9
Author(s):  
Галина Кравченко ◽  
Galina Kravchenko ◽  
Елена Труфанова ◽  
Elena Trufanova ◽  
Денис Суслопаров ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Strain State ◽  
Element Model ◽  
Frame Structures ◽  
Stress Strain ◽  
Snow Load ◽  
Stress Strain State ◽  
Snow Pressure ◽  
Snow Loading

The multi-variant loading of the large-span unique steel covering of the stadium under snow load is considered. The spatial finite element model is developed using LIRA software. The analysis of the existing schemes application of snow loading is carried out according to the codes. Four snow load cases on the stadium's covering are assumed for analysis. The analysis of the stress-strain state of the stadium structures, the selection and verification of sections of the steel covering are performed. The results show that it is necessary to simulate behaviour of a structure under all possible load cases.

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