Siavash Shoja
Mechanical
Hi,
I am modelling Lamb waves propagation in a laminate structure. The excitation force is a tone-burst signal in out of plane direction which creates mostly bending modes. In order to take into account the bending modes, I used S4RS element which uses mindlin-reissner theory for transverse shear stress. I also used the composite layups to build up my material which is a laminate with [0,90,90,0] fibre directions. In addition for my shell section I use section integration before analysis with idealization "Smear all layers".
I compared the results with a solid model and they seem in a good agreement however in the shell model I get some sort of numerical problem in one of the wave modes (attached picture). Seems this problem is directly related to the element type cause when I change the elements to S4R I don't get it however the results are not correct cause S4R doesn't use mindlin-reissner theory.
Anyone has experienced this before? Or do you know how can I get rid of it?
/Siavash
I am modelling Lamb waves propagation in a laminate structure. The excitation force is a tone-burst signal in out of plane direction which creates mostly bending modes. In order to take into account the bending modes, I used S4RS element which uses mindlin-reissner theory for transverse shear stress. I also used the composite layups to build up my material which is a laminate with [0,90,90,0] fibre directions. In addition for my shell section I use section integration before analysis with idealization "Smear all layers".
I compared the results with a solid model and they seem in a good agreement however in the shell model I get some sort of numerical problem in one of the wave modes (attached picture). Seems this problem is directly related to the element type cause when I change the elements to S4R I don't get it however the results are not correct cause S4R doesn't use mindlin-reissner theory.
Anyone has experienced this before? Or do you know how can I get rid of it?
/Siavash
