PROBLEM 11.3 : MATERIALS SELECTION

Function of Design	Material Properties
1.      Strength in bending	·         Strengthness - The ability of a material to stand up to forces being applied without it bending, breaking, shattering or deforming in any way. ·         is defined as a material's ability to resist deformation under load. The transverse bending test is most frequently employed, in which a rod specimen having either a circular or rectangular cross-section is bent until fracture using a three point flexural test technique. The flexural strength represents the highest stress experienced within the material at its moment of rupture.
2.      Resistance to twisting	·         Hardness - the property of a material to resist permanent indentation. ·         Strengthness - The ability of a material to stand up to forces being applied without it bending, breaking, shattering or deforming in any way.
3.      The ability of a sheet material to be stretched into a complex curvature	·         elasticity, ability of a deformed material body to return to its original shape and size when the forces causing the deformation are removed. ·         ductility is a solid material's ability to deform under tensile stress; this is often characterized by the material's ability to be stretched. ·         forming by using tensile forces to stretch the material over a tool or form block, required materials with appreciable ductility.
4.      The ability to resist fracture from cracks at low temperatures	·         fracture toughness is a property which describes the ability of a material containing a crack to resist fracture ·         is a form of thermal cracking and results from a single drop in temperature to an extreme low, below the fracture temperature of the material.
5.      The ability to resist shattering if dropped on the floor.	·         Toughness is the property that enables a material to withstand shock and to be deformed without rupturing. ·         the act of violently breaking into small pieces.
6.      The ability to resist alternating cycles of rapid heating and cooling	·         Thermal shock resistance- material's ability to withstand rapid changes in temperature. ·         is a technique that is used to improve the surface quality of a part, while keeping the cycle time as short as possible.