What are typical factors of safety for Aerospace Engineering

What are typical factors of safety for Aerospace Engineering, Mechanical Engineering and Civil Engineering? Explain why the factors of safety are different for each type of engineering/application.

Solution

factor of safety is defined as the ratio of ultimate or yield strentgh of material to the allowable strength of material. this safety factor depends on the type of material used in different applicatio for example for briitle material large safety factor is used because these material fails suddenly without casing any elongation while for brittle material such phenomena doesnt occurs frst they elonged and then fails hence in ductile material failure can be preassumed and component can be changed to avoid falure.