eNotes: Mechanical Engineering
   



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26.5 FACTOR OF SAFETY


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When we do basic design work we typically use a process of the basic format,



In particular the design process often involves a factor of safety that allows for,

- variations in material properties
- variations in expectations load
- the non-uniform distribution of stress
- cyclic loading
- etc

The factor of safety is applied as,



The values vary for various systems. The values given below are reasonable for static systems.



For example let us consider a two member mechanism 1.44 from [Beer and Johnston]



26.5.1 Practice Problems

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