Page 431 - Biaxial Multiaxial Fatigue and Fracture

Cyclic Behaviour of a Duplex Stainless Steel Under Multiaxial Loading: Experiments and Modelling 41 5

Table 6. Material parameters of model NLK.

~~
E G v k CJY, YI C,/Y, ~2 qm bl QI
190 GPa 65 GPa 0.3 390 MPa 180 MPa 1900 21209 MPa 0.786 12.79 0.728 3.2 -84.5 MPa

700
650
600
550
E
500
7 7
400 k
-0.015 0.015
450
0 100 200 300 400 500
Number of cycles

800
1000
700
800
600
600
500
400
400
200
300
E
0 7 0 100 200 300 400
0 0.01 0.02 0.03 Number of cycles

I - Model 0 Experiment I

Fig. 12. Comparison between experiments and simulation for model NLK. (a) Cyclic stress-
strain response in tension-compression tests (E~ = 0.35; 0.5; 0.8; 1.0 %); (b) cyclic
hardeninglsofiening curves in tension-compression tests (E~ = 0.35; 0.5; 0.8; 1.0 %); (c)
monotonic stress-strain response; (d) cyclic hardeningkofiening curve for a circle path (E~ =
0.5 %).