en:ref:d:6
Table of Contents
Norton Model
The Norton creep model describes the secondary phase. With the assumption of a constant temperature the model is defined by two constants: $K,$ and $n.$
The creep strain is defined as $$\varepsilon_c = K\sigma_e^nt$$ and the creep strain rate as $$\dot\varepsilon_c = K\sigma_e^n.$$
Input quantities
The Norton-Bailey model is activated by the parameter $\mathtt{KCRP}=2$ in the file name.iP.
All materials used must be assigned to the elements using the file name.DAT.
The material parameter files have the following structure:
* * Comments *
NORTON
POCET DAT $N$
DATA $T_1$ $K_1$ $n_1$ $\vdots$ $T_N$ $K_N$ $n_N$
- The number of initial comment lines is unlimited.
- There must be an empty line before each block.
- The block
NORTONdoes not contain any values. - The block
POCET DATcontains the number of lines $N$ in the blockDATA, $N\le30.$ - The block
DATAcontains $N$ lines of three values $[T,K,n].$ Temperatures are specified in $^\circ\text{C}.$
Example
There is only one material used in the creep problem.
- name.iP
; KREST NLC NCYC KMOD KCRP KLARG KCNT IP 1 11 1 0 2 0 0 3*0 11*2 RP 10*0 0 1 100 1000 10000 30000 80000 120000 160000 200000 250000 EN EN
- name.DAT
number 1 norton.dat
- norton.dat
************************************************************************ * * * test example * * * * parameters description * * * * NORTON identification of the Norton model * * POCET DAT the number of data lines (max. 30) * * DATA 3 parameters on each line * * T temperature in deg. Celsius * * K model parameter * * N model parameter * * * ************************************************************************ NORTON POCET DAT 28 DATA 340 2.4282E-19 4.9150 350 1.51234E-19 5.0234 360 9.31171E-20 5.1359 370 5.53073E-20 5.2565 380 3.0002E-20 5.3959 390 1.68129E-20 5.5314 400 9.91758E-21 5.6603 410 4.9205E-21 5.8236 420 2.49519E-21 5.9860 430 1.24508E-21 6.1548 440 6.08478E-22 6.3312 450 2.87107E-22 6.5183 460 1.31155E-22 6.7156 470 5.26772E-23 6.9431 480 2.64874E-23 7.1327 490 1.11539E-23 7.3626 500 4.54716E-24 7.6057 510 2.10026E-24 7.8318 520 1.01107E-24 8.0572 530 5.05124E-25 8.2848 540 3.38093E-25 8.4616 550 2.31461E-25 8.6434 560 1.97367E-25 8.7906 570 3.30899E-25 8.8048 580 6.56265E-25 8.7918 590 2.56449E-24 8.6381 600 1.92865E-23 8.3449 610 2.85575E-22 7.8988
en/ref/d/6.txt · Last modified: 2024-11-12 10:35 by Petr Pařík