![]() This plastic rod has a cross-sectional area of 1 cm 2. The Brinell hardness number is computed from the equation:īrinell hardness of Polystyrene is approximately 50 BHN (converted).Īssume a plastic rod, which is made of Polystyrene. The diameter of the impression is measured with a microscope with a superimposed scale. The Brinell hardness number (HB) is the load divided by the surface area of the indentation. In Brinell tests, a hard, spherical indenter is forced under a specific load into the surface of the metal to be tested. Brinell hardness test is one of indentation hardness tests, that has been developed for hardness testing. In materials science, hardness is the ability to withstand surface indentation ( localized plastic deformation) and scratching. The Young’s modulus of elasticity of Polystyrene is 3.4 GPa. Ultimate tensile strength of Polystyrene is 48 MPa. See also: Strength of Materials Ultimate Tensile Strength of Polystyrene The Young’s modulus of elasticity is the elastic modulus for tensile and compressive stress in the linear elasticity regime of a uniaxial deformation and is usually assessed by tensile tests. In case of tensional stress of a uniform bar (stress-strain curve), the Hooke’s law describes behaviour of a bar in the elastic region. Yield strength or yield stress is the material property defined as the stress at which a material begins to deform plastically whereas yield point is the point where nonlinear (elastic + plastic) deformation begins. For tensile stress, the capacity of a material or structure to withstand loads tending to elongate is known as ultimate tensile strength (UTS). Strength of a material is its ability to withstand this applied load without failure or plastic deformation. In designing structures and machines, it is important to consider these factors, in order that the material selected will have adequate strength to resist applied loads or forces and retain its original shape. Strength of materials basically considers the relationship between the external loads applied to a material and the resulting deformation or change in material dimensions. In mechanics of materials, the strength of a material is its ability to withstand an applied load without failure or plastic deformation. Mechanical Properties of Polystyrene Strength of Polystyrene XPS is most commonly used as foam board insulation. Expanded (EPS) and extruded polystyrene (XPS) are both made from polystyrene, but EPS is composed of small plastic beads that are fused together and XPS begins as a molten material that is pressed out of a form into sheets. Polystyrene foams are good thermal insulators and are therefore often used as building insulation materials, such as in insulating concrete forms and structural insulated panel building systems. Polystyrene is a colorless, transparent thermoplastic, which is commonly used to make foam board or beadboard insulation and a type of loose-fill insulation consisting of small beads of polystyrene. ![]() General-purpose polystyrene is clear, hard, and rather brittle. Polystyrene, abbreviated as PS, is a synthetic aromatic hydrocarbon polymer made from the monomer known as styrene, which is derived from benzene and ethylene, both petroleum products.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |