Temperature Fields in Structural Elements Subject to Fires

1975 ◽  
Vol 97 (4) ◽  
pp. 598-604 ◽  
Author(s):  
M. S. Sahota ◽  
P. J. Pagni
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Mixed Boundary ◽  
Mixed Boundary Conditions ◽  
Temperature Curve ◽  
Temperature Fields ◽  
Structural Element ◽  
Reinforced Concrete Column ◽  
American Society ◽  
Good Agreement

The transient, two-dimensional temperature field in a rectangular structural element subject to time dependent, nonlinear mixed boundary conditions has been obtained with a minimum of numerics. General results are given for two extreme fire histories, the American Society for Testing and Materials E-119 time-temperature curve and a short-duration high-intensity time-temperature curve. Comparisons are made with finite element and experimental temperature fields in a reinforced concrete column; good agreement is obtained. The stress field generated from the analytic temperature field also shows good agreement with finite element calculations. Applications to structural fires are discussed.

scholarly journals Finite Element Study of Container Structure under Normal and High Temperature

2016 ◽  
Vol 2016 ◽  
pp. 1-15 ◽  
Author(s):  
Xiaoxiong Zha ◽  
Yang Zuo
Keyword(s):  
Finite Element ◽  
High Temperature ◽  
Research Result ◽  
Temperature Curve ◽  
Temperature Fields ◽  
Wind Loading ◽  
Coupled Analysis ◽  
Fire Dynamics ◽  
Standard Temperature ◽  
Actual Temperature

This paper does some research on the mechanical property of multilayer container structure under high temperature and gives some suggestions on how to make fire protection based on the performance-based fire design. Firstly, using the software of FDS (Fire Dynamics Simulator), the fire background and fire heating release curve are determined. Through the simulation, the actual temperature curves (of the top and bottom temperature curves of the middle, door, and corner position in the container) are obtained and compared with the standard temperature curve of ISO-834. Secondly, using the software of Abaqus, a full scale finite element model of multilayer container structure is established. Two temperature fields under the standard temperature curve of ISO-834 and the actual temperature curve (of the most unfavorable curve of the top temperature curve of the middle position in the container) are obtained, respectively. Thirdly, the thermal-mechanical coupled analysis is carried out for the container structure under the wind loading and temperature field. The research result can be feasible in design and construction of container buildings and provides some references to corresponding specification preparation.

Piezothermoelasticity and Precision Control of Piezoelectric Systems: Theory and Finite Element Analysis

1994 ◽  
Vol 116 (4) ◽  
pp. 489-495 ◽  
Author(s):  
H. S. Tzou ◽  
R. Ye
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Degrees Of Freedom ◽  
Piezoelectric Sensor ◽  
Temperature Fields ◽  
Element Analysis ◽  
Energy Functionals ◽  
System Equation ◽  
Distributed Controls ◽  
And Control

Piezothermoelastic effects of distributed piezoelectric sensor/actuator and structural systems are studied. Distributed controls (static and dynamic) of piezoelectric laminates subjected to a steady-state temperature field are investigated. Piezothermoelastic constitutive equations are defined, followed by three energy functionals for the displacement, electric, and temperature fields, respectively. A new 3-D piezothermoelastic thin hexahedron finite element with three internal degrees of freedom is formulated using a variational formulation which includes thermal, electric, and mechanical energies. A system equation for the piezoelectric continuum exposed to combined displacement, electric, and temperature fields is formulated. Distributed sensing and control equations of piezoelectric laminates in a temperature field are derived. Thermal influences on the sensing and control of piezoelectric PZT/steel laminates are investigated in case studies.

scholarly journals Calculation of temperature fields during lathe machining with thermoelectric cooling by using the finite element method

2019 ◽  
Vol 23 (3 Part B) ◽  
pp. 1889-1899
Author(s):  
Radovan Nikolic ◽  
Miroslav Lucic ◽  
Bogdan Nedic ◽  
Miroslav Radovanovic
Keyword(s):  
Mathematical Model ◽  
Finite Element Method ◽  
Finite Element ◽  
Temperature Field ◽  
Cutting Tool ◽  
Thermoelectric Module ◽  
Temperature Fields ◽  
Prototype Model ◽  
The Finite Element Method ◽  
Element Method

The aim of this work is to explore the possibilities of the implementation of systems based on a thermoelectric module for cooling the cutting tool. This cooling becomes significant when it is not possible to use conventional coolants and lubricants. Starting from existing mathematical models for the calculation of the temperature field of the cutting tool, a mathematical model is developed that takes into account the cooling based on the thermoelectric module. The use of the finite element method determines temperature field when dry lathe machining in the cooling conditions based on the thermoelectric module. The Software package, PAK-T, is used for the calculations and was developed at the Department of Applied Mechanics, Faculty of Engineering in Kragujevac, Serbia. The system for cooling the cutting tool based on the thermoelectric module was realized under laboratory conditions on a prototype model, which consists of a cutting tool and a thermoelectric module. Verification of the obtained results was carried out on the basis of a mathematical model by experimental research of the temperature field of the cutting tool in terms of cooling based on a thermoelectric module.

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