Explain in your own words how the load (durability) test,(performance test) is applied to the patient turning apparatus shown in the figure, and guess how the expected result will be. Please answer...

Explain in your own words how the load (durability) test,(performance test) is applied to the patient turning apparatus shown in the figure, and guess how the expected result will be. Please answer considering the patient's leg weight and the sponge used in the product.

The main part of the product consists of a polyurethane sponge. Stain-proof upholstery fabric will be used as the outer surface material. In addition, there are heating pads working with the logic of electric blankets in this apparatus, please answer by taking these into account when answering.