*3.1.2 Compressive strength*

Compressive strength is the ability of a polymer material to resist the direct pressure of applied compressive force [19]. It is the ability of the polyethylene material under test to resist loads applied, thereby shortening the length of the material under compression. Its force acts in the opposite direction to the tensile force applied to the load. Compression is a force that pushes the particles of material closer together, thereby reducing the size of the materials. The compressive modulus is equal to the elastic modulus at minor strains and gives a reliable compressive stress and strain ratio. When a compressive force is applied to a PE material, it yields slowly and hardly fails.
