Original scientific paper

Lumped parameter model with inner state variables for modeling hot deformability of steels

F. Vode ; Institute of Metals and Technology, Ljubljana, Slovenia
J. Burja ; Institute of Metals and Technology, Ljubljana, Slovenia
F. Tehovnik ; Institute of Metals and Technology, Ljubljana, Slovenia
B. Arh ; Institute of Metals and Technology, Ljubljana, Slovenia

Abstract

A novel method for description of stress-strain relationship for hot deformability of steels is presented. Laplacian transformation of stress-strain data obtained on cylindrical hot compression tests offer simple description of dynamical input/output relationship between strain (input) and stress (output). In this paper, strain/stress relationship is described using transfer function of the third order. Parameters of transfer function are determined by numerical optimization for temperatures 1 000, 1 100 and 1 200 °C and logarithmic strain rates 10, 5 and 1 s-1. Obtained relative model error is around 1 % for logarithmic deformations in the range 0,1 <  < 0,8.

Keywords

Alloyed steel; Hot deformability; stress-strain curves; mathematical model; Laplacian transformation

Hrčak ID:

168901

URI

https://hrcak.srce.hr/168901

Publication date:

2.1.2017.

Visits: 1.126 *