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... of Elasti Theory Stress is a measure of an internal force that an object experiences per unit cross sectional area while strain. Mathematically, this can be expressed as (Lees, 2011):
σ -is the stress in newton per meter
Other terms related to stress are tensile strength and yield strength. The tensile strength refers to the level of stress that a material fractures (Lees, 2011). For this reason, tensile strength is also called fracture stress. A material is said to be brittle if it fractures by crack propagation. On the other hand, yield stress is the point at which a material permanently deforms (Lees, 2011). Stress often causes a material to stretch, whi...