I need to find the impact force that can be absorbed by these spacers as shown in the image. The spacers are radially distributed over the shell, and they are supposed to dampen any external impact loads to reduce the effective stress inside the inner shell. Since the FEA model is not showing results, I thought of attempting it by hand to get an approximate value. A curve relating the impact load and stress at the inner shell would be enough. However, I cannot figure out how to account for the distribution of these spacers, since depending on the load some of these will be in tension, compression and/or shear. The shell is polycarbonate and the spacers are silicon rubber.