Tensile strength, Mechanical stress and Mechanical strain.
In the international system tensile strength is expressed in Pascals or Megapascals, which is equivalent to Newtons per square meter (N/m²). In the American system it is expressed in pounds per square inch (lbf/in² or psi).
Tensile strength refers to the load that a material with a particular cross-sectional area can withstand when loaded in tension under specified conditions. For example, a weight hanging on the end of a metal cable creates a tensile load in the cable. As more weight is continually added to the end of the cable, it will begin to stretch until it begins to permanently deform, or “yield,” to the load. reaches its yield point which means that any more weight will cause the cable to permanently deform. If even more weights are added, the cable will eventually begin to neck down at one focal point and break. The various points of failure can be measured as stress which is defined as the force per unit area.
