![]() Such discontinuities cause a local increase in stress, referred to as a stress concentration factor. Shoulders on shafts, oil holes, key ways and screw threads all can change the stress distribution such that the basic stress analysis equations no longer apply. In practice, virtually all engineering components have at least minimal changes in section and/or shape. Note that the reference stress is the total stress within an element under the same loading conditions, but without any stress concentrators (i.e., the total stress on the part when it is free from discontinuities).Īn understanding of the stress concentration factor is important during the material selection process as well as for anticipating stress corrosion cracking, fretting corrosion and material failures.Ĭorrosionpedia Explains Stress Concentration Factor (Kt)īasic stress analysis calculations assume that parts are smooth, have a uniform cross-section, and have no irregularities. Stress concentrations may also be caused by accidental damage such as nicks and scratches.Ī discontinuity’s degree of concentration under typical tensile loads is usually expressed by the non-dimensional stress concentration factor (Kt), which is the ratio of the highest stress to the reference (far field) stress: These interruptions typically arise from discontinuities such as holes, grooves, notches and fillets. ![]() Stress concentrations occur as a result of irregularities in the geometry or within the material of a component structure that cause an interruption of the stress flow. ![]() ![]() It is defined as the ratio of the highest stress in the part compared to a reference stress.Ī stress concentration, also known as a stress riser/raiser, is a point in a part where the stress is significantly greater than its surrounding area. What Does Stress Concentration Factor (Kt) Mean?Ī stress concentration factor (Kt) is a dimensionless factor that is used to quantify how concentrated the stress is in a mechanical part. ![]()
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