Mechanical Engineering: Handbook For Formulas (GATE, ESE, SSC JE and other Competitive Exams) by Feroz Navy

Author:Feroz, Navy [Feroz, Navy]
Language: eng
Format: epub
Published: 2019-10-15T16:00:00+00:00

The factor of safety must be always greater than unity. It is easier to refer to the ratio of stresses since this applies to material properties.

F.O.S = failure stress / working or allowable stress

Static Failure Theories

Maximum Principal Stress Theory (Rankine Theory):

The principal stresses σ1 (maximum principal stress) , σ2 (minimum principal stress) or σ3 exceeds the yield stress, yielding would occur.

For two dimensional loading situation for a ductile material where tensile and compressive yield stress are nearly of same magnitude:

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