Stress analysis of bed design.... I have a bed design and i need to do a stress analysis of the top bunk under a 90kg load. I will be designing it from 20mm thick plywood but i need to work out whether this is thick enough to support the load and also determine the width of the leg supports. In the diagram (attached) the bed slides up on slide rails into a locking position and 4 legs are pulled down fitting into holes in the lower bunk. View attachment Assembly1.pdf Please can people offer me some hints on how to go about this problem? Thankyou, Cabellos.