What is Stiffness. Stiffness, denoted by the letter (k), is a measure of the resistance of an object to deformation in response to an applied load.In other words, stiffness is the ability of a material or a structure to resist bending, twisting, or stretching. The stiffness of a material is mainly determined by its elastic modulus, which measures the material’s ability to return to its ... More @Wikipedia
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