Page 375 - Handbook of Materials Failure Analysis

3 Case Study: Fatigue Life Assessment of an Automotive Demo-Structure 373

300

200

100
Stress (MPa) –0.02 –0.01 –100 0 0.01 0.02

Exp.
–200
UMAT
–300
(a) Strain (mm/mm)
250
200
150
100
50
Stress (MPa) –0.006 –0.003 –50 0 0 0.003 0.006

–100
–150 Exp.
–200 UMAT
–250
(b) Strain (mm/mm)
200

150
100

50
Stress (MPa) –0.008 –0.004 –50 0 0 0.004 0.008

–100
Exp.
–150
UMAT
–200
(c) Strain (mm/mm)
FIGURE 14.11
Cyclic stress-strain response for (a) AZ31B under ε amp ¼ 1:5%, (b) AM30 under
ε amp ¼ 0:6%, (c) AM60B under ε amp ¼ 0:8%.