l***@gmail.com
2013-10-22 11:37:47 UTC
Hello,
The model is a semi-circle in 2D, fixed at its diameter which is at the bottom, and with a force applied at the top in the vertical direction. Therefore, the material is compressed and "bulges" on the sides.
The material law is Saint-Venant Kirchhoff. My issue is that computations do not converge for deformations above ~10-15% (see model attached). It seems that there is an abnormally high displacement gradient at the "corner"of the circle (i.e., the free boundary that is closest to the fixed bottom).
Do you have either an explanation of why this material law is inappropriate (the same model converges with a linear elastic material law or with a neo-hookean material law) or a suggestion on what I can improve to make the computations converge for large deformations?
Thank you,
Lionel
The model is a semi-circle in 2D, fixed at its diameter which is at the bottom, and with a force applied at the top in the vertical direction. Therefore, the material is compressed and "bulges" on the sides.
The material law is Saint-Venant Kirchhoff. My issue is that computations do not converge for deformations above ~10-15% (see model attached). It seems that there is an abnormally high displacement gradient at the "corner"of the circle (i.e., the free boundary that is closest to the fixed bottom).
Do you have either an explanation of why this material law is inappropriate (the same model converges with a linear elastic material law or with a neo-hookean material law) or a suggestion on what I can improve to make the computations converge for large deformations?
Thank you,
Lionel