Aluminum, plastic behavior at high temperatures

[jj89]

Hi,

I would like to implement plastic behavior at 480 ºC.
I got those results with Ludwik law:

Plastic stress= 50 MPa
K 400
n 0,17
E 35500

and plastic data is:

Stress Strain
50 0
60 0,00140845
70 0,00140847
80 0,00140869
90 0,00140976
100 0,00141332
110 0,00142269
120 0,00144371
130 0,00148579
140 0,00156309
150 0,00169584
160 0,00191190
170 0,00224838
180 0,00275346
190 0,00348837
200 0,00452951
210 0,00597067
220 0,00792552
230 0,01053011
240 0,01394557
250 0,01836101
260 0,02399648
270 0,03110607
280 0,03998128
290 0,05095431
300 0,06440173
310 0,08074811
320 0,10046987
330 0,12409925
340 0,15222842
350 0,18551374
360 0,22468008
370 0,27052543
380 0,32392547
390 0,38583840
400 0,45730982
410 0,53947785

Does it look well ?

Any recomentation to improve the data?

Do you know any other law to use? in case of, which parameters could I use)

Best regards!!

Juan

 

[StefCon]

Hi,
The best would be to compare to test data (but the industry wants results and don't care about tests! )

ASME VIII, Division 2, ANNEX 3-D STENGTH PARAMETERS has equations for creating a material curve that looks really nice.

The following model for the stress-strain curve shall be used in design calculations where required by this Division
when the strain hardening characteristics of the stress-strain curve are to be considered. The yield strength and ultimate
tensile strength in paragraphs 3-D.1 and 3-D.2 may be used in this model to determine a stress-strain curve at a specified
temperature.

If you want I can create a curve for you that you can compare to or see if it looks good. What data I need for that is:

Material type:
Ferritic steel, Stainless steel and nickle base alloys, Duplex stainless steel, precipitation hardenable nickle base, Aluminium, Copper OR Titanium/Zirconium

Youngs modulus:

Yield strength:

Tensile strength:

Example (E=205 GPa, yield=355 MPa, tensile=480 MPa, Ferritic):
177.5 0
284 6.5844E-05
319.5 0.000395606
356.3968 0.00218873
368.8968 0.00388152
381.3968 0.006878687
393.8968 0.011732748
406.3968 0.017941644
418.8968 0.024010071
431.3968 0.029599113
443.8968 0.035410141
456.3968 0.042021428
468.8968 0.049727516
481.3968 0.0586984
497.30586 0.07216966
513.21492 0.088233518
529.12398 0.107249854
545.03304 0.129629505
560.9421 0.155834082

Cheers!