Stress-Strain Curves of Structural Steel after Exposure to Elevated Temperatures

2012 ◽  
Author(s):  
Xing-Qiang Wang ◽  
Zhong Tao ◽  
Brian Uy
Keyword(s):  
Structural Steel ◽  
Elevated Temperatures ◽  
Stress Strain

Finite element modeling of structural steel component failure at elevated temperatures

Structures ◽  
2016 ◽  
Vol 6 ◽  
pp. 134-145 ◽  
Author(s):  
Mina Seif ◽  
Joseph Main ◽  
Jonathan Weigand ◽  
Therese P. McAllister ◽  
William Luecke
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Structural Steel ◽  
Elevated Temperatures ◽  
Steel Component ◽  
Component Failure ◽  
Element Modeling

A Three-Stage Explicit Stress-Strain Relations for Stainless Steel Alloys Applicable in Tension and Compression at Elevated Temperatures

2012 ◽  
Vol 730-732 ◽  
pp. 691-696
Author(s):  
Abdella Kenzu
Keyword(s):  
Stainless Steel ◽  
Elevated Temperatures ◽  
Full Range ◽  
Elastic Behaviour ◽  
Stress Strain ◽  
Strain Relation ◽  
Stress Strain Relation ◽  
Wide Range ◽  
Tension And Compression ◽  
Linear Elastic Behaviour

Presented in this paper is an explicit full-range stress-strain relation for stainlesssteel alloys applicable at normal and elevated temperatures. The relation utilizes an approxima-tion of the closed form inversion of a highly accurate three-stage stress-strain relation recentlyobtained from the Ramberg-Osgood equation. The three stage inversion is formulated using anappropriate rational function assumption to approximate the fractional deviation of the actualstress-strain relation from an idealized linear elastic behaviour. The temperature dependenceon the stress-strain relation is then introduced by modifying the basic mechanical propertiesof stainless steel to account for the temperature e ects. The proposed approximate inversionis applicable over the full-range of the stress well beyond the elastic region up to the ultimatestress. Moreover, the inversion can be applied to both tensile and compressive stresses. Theproposed approximate inversion is tested over a wide range of material parameters as well as awide range of temperatures. It is shown that the new expression results in stress-strain curveswhich are both qualitatively and quantitatively in excellent agreement with experimental re-sults and the fully iterated numerical solution of the full-range stress-strain relation for normalas well as elevated temperatures

A Modified Johnson–Cook Model to Predict Stress-strain Curves of Boron Steel Sheets at Elevated and Cooling Temperatures

2012 ◽  
Vol 31 (1) ◽  
Author(s):  
Nguyen Duc-Toan ◽  
Banh Tien-Long ◽  
Jung Dong-Won ◽  
Yang Seung-Han ◽  
Kim Young-Suk
Keyword(s):  
Tensile Test ◽  
Elevated Temperatures ◽  
Strain Curve ◽  
Boron Steel ◽  
Isotropic Hardening ◽  
Air Cooling ◽  
Stress Strain ◽  
Material Parameters ◽  
Hardening Law ◽  
Simulation Results

AbstractIn order to predict correctly stress-strain curve for tensile tests at elevated and cooling temperatures, a modification of a Johnson–Cook (J-C) model and a new method to determine (J-C) material parameters are proposed. A MATLAB tool is used to determine material parameters by fitting a curve to follow Ludwick and Voce's hardening law at various elevated temperatures. Those hardening law parameters are then utilized to determine modified (J-C) model material parameters. The modified (J-C) model shows the better prediction compared to the conventional one. An FEM tensile test simulation based on the isotropic hardening model for metal sheet at elevated temperatures was carried out via a user-material subroutine, using an explicit finite element code. The simulation results at elevated temperatures were firstly presented and then compared with the measurements. The temperature decrease of all elements due to the air cooling process was then calculated when considering the modified (J-C) model and coded to VUMAT subroutine for tensile test simulation. The modified (J-C) model showed the good comparability between the simulation results and the corresponding experiments.

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