Hi everyone, I have recently been tasked to find the stress, strains as well as safety factors for a human sitting on a folding stool. While I have prior knowledge of stress and strain calculations, I am quite clueless on how I should go about starting my calculations for this particular item. I have attached an image of the chair below. It can be assumed that the chair is just a cuboid, and that the faces at the side is a full rectangle unlike the one shown below where there are some material cut off to reduce the weight. The material it is made of is HDPE. I would really appreciate any help or hints for me to get started!