what is the factor that assures strength..,,........?
Answers
Answer:
Factor of Strength (FOS)
As a general definition, FOS can be termed as a factor which, when applied to the elastic stresses from FEA at a node, will produce the corresponding design life at the node. The significant advantage of using FOS comes from the ability of user to calculate safety factor based on target life of the component. To be more specific on how FE-SAFE calculates FOS; it uses an iterative procedure as defined below:
For a given elastic stress at a node, the fatigue life is calculated
This fatigue life is compared with the design life or target life specified by the user
The elastic stresses at the node are scaled
By a factor less than 1.0, if the calculated life is lower than design life
By a factor greater than 1.0, if the calculated life is greater than design life
Elastic stress history is recalculated using scaled stress. The fatigue life is then recalculated. This process is repeated with different scale factors until it finds the scale factor to give the required design life. This makes the method more generic and broadens its application to complex loading history and low cycle fatigue analysis. The method takes longer computational time but is more accurate. It can be applied to calculate safety factor for both target life as well as infinite life of the material. This method is unique to FE-SAFE.
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