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335
JL dalt (10)
Where
Solution of the problem is accomplished by an implicit backward Euler integration scheme, where
the Newton-Raphson iterative procedure is employed. The calculated stress-strain relationships for
uniaxial compression and tension by this model are shown in Fig.3-6. The material properties used
wereyc0=22.0MPa,y;0=1.45MPa, v=0.17 and E=1.9xl0 4 MPa. Comparison with experimental data is
made and a fairly good agreement is achieved.
-SOO 0 SCO 1000 1500 2000 2500 3000 3500
Strain (10 8 )
Fig.3 Stress-strain relationship of the model for
uniaxial tension
Fig.4 Stress-strain relationship of the model for
uniaxial compression
Experimental
Numerical
1 strain rate: 10 s /s
2 strain rate. 10 3 /s
1 strain rate 10 s /s
2 strain rate. 10 a /s
3 strain rate 10 T /s
60 SO 100 12Q 140 160
Strain (lO*)
5QO 100Q 1500 2000 2500 3000 3500
Strain (10"*)
Fig.5 Stress-strain relationship of the model for
uniaxial tension with different stain rate
Fig.6 Stress-strain relationship of the model for
uniaxial compression with different stain rate