about FOS

1. Factor of Safety
◦ Name of the Creator: Nitesh Kumar
◦ Designation: AP
◦ Department: Mechanical Engineering
◦ School & University Name: School of
Engineering & Technology, Sharda
University

2. FACTOROF SAFETY
•It is defined as the ratio of the material strength
ultimate strength or yield strength or endurance
strength to the working or allowablestress.
Factor of safety= Material strength/Designstress
•Factor of safety for static loading of ductile
material: In case of the static loading of ductile
materials where the yield point is clearly defined, the
factor of safety is based on yield strength and is defined
as
Factor of safety= Yield strength/Design stress

3. •Factor of safety for static loading of brittle material: In case
of the static loading of material, the factor of safety is based
on the ultimate strength.
Factor of safety= Ultimate strength/Designstress
•Factor of safety for fatigue loading: In case of fatigue
loading, the factor of safety is based on endurancelimit.
Factor of safety= Endurance limit/Design stress