lpavlc
Bioengineer
- Sep 25, 2010
- 2
Hi, i'm trying to run a low cycle fatigue analysis of an osteporotic bone fracture with a fracture plate and some screws on abaqus 6.10.
Im trying to evaluate the stiffness loose of the system.
I defined the young's modulus in the elastic behaviour of the bone; then i defined some points of the plastic behaviour of the bone (yield stress= 2 Mpa).
Then i wrote in the keywords editor, in the material properties: "*DAMAGE INITIATION, CRITERION=HYSTERESIS ENERGY", and i introduced the constants c1 and c2 (41.6e-6 and -1.433).
I defined a variable force and took information about the displacement of a point for evaluating the stiffness lost.
The system lost stiffness for thre cycles and then, the displacement of the point stablished; but i want that the system keep loosing stiffness for about 1000 cycles.
How can i do that? I'm doing someting wrong? what values of the parameters should i write? and do i need to define a damage evolution?
Thanks a lot for your help!
Im trying to evaluate the stiffness loose of the system.
I defined the young's modulus in the elastic behaviour of the bone; then i defined some points of the plastic behaviour of the bone (yield stress= 2 Mpa).
Then i wrote in the keywords editor, in the material properties: "*DAMAGE INITIATION, CRITERION=HYSTERESIS ENERGY", and i introduced the constants c1 and c2 (41.6e-6 and -1.433).
I defined a variable force and took information about the displacement of a point for evaluating the stiffness lost.
The system lost stiffness for thre cycles and then, the displacement of the point stablished; but i want that the system keep loosing stiffness for about 1000 cycles.
How can i do that? I'm doing someting wrong? what values of the parameters should i write? and do i need to define a damage evolution?
Thanks a lot for your help!