I had the same doubt at the beginning. However, it seems not the case here. I've solved the problem by reducing the sensitivity to initial distortion on the flat plate elements. Finally it works!
Hi,
I have a FEM model. With different K6ROT values, the frequencies are different. The 1st frequency with K6ROT equal to 1.0 is about 9 hz lower than the 1st freq. with K6ROT equal to 100. It seems some locations need to be stiffened up. How can I find these locations? Currently I don't...