increase stiffness in contact between shell and solid - LSDYNA
I am doing a three point bending test. In the results below, you will see that when I use mid-plane surface in the shell, the contact stiffness is lower. However, when I use NLOC, the stiffness is higher but there seem to vibrations in results. I tried to set VDC to 100% percent but the vibrations still exist. Is there a workaround to this problem where we can increase the stiffness without going to material properties?
PS. I tried changing penalty factors in the contact but that does not work.