What are the factors that can affect the Factor of safety selection?

The factor of safety is can be selected based on the material. FS =  Tensile strength / working strength. For a particular material the tensile strength is constant and the working strength depends on the application . So selecting  the suitable material play a vital role in choosing factor of safety .Once the material is selected the FS depends.

1. Economic reason if you increase the factor of safety quantity of material increases and the cost increases.

2. Application - where light weight is an essential factor( example in aircraft parts) a high value of FS is not desirable.

There are many factors as

:1- materials strength (if the materials is a brittle or ductile)

.2-possible misuse:the designer must consider any responsible of for foreseeable use

.3-loading(static.impact,repeated).

4- complexity of stress analysis

.5-cost6-environment and temperature , and this factor affect also to choose the materials.

and we can say also each factor from the previous factors affects on another one its like a network and the designer person must know this Entanglement perfectly

oily area . unproper safety shows