Metalurgija, Vol. 56 No. 1-2, 2017.
Izvorni znanstveni članak
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
Sažetak
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.
Ključne riječi
Alloyed steel; Hot deformability; stress-strain curves; mathematical model; Laplacian transformation
Hrčak ID:
168901
URI
Datum izdavanja:
2.1.2017.
Posjeta: 834 *