Hi, I am trying to find out if permissible stress and tensile are the same.If not,what is their relation?Thank you.
First thing to decide is if you mean tensile strength as in your title or tensile stress as your post implies.
Tensile stress refers to a type of stress.
Strength refers to the maximum possible stress of that type that can be applied without failure.
So tensile strength refers to the maximum possible tensile stress, at which point the subject fails.
Permissible stress refers to an amount of stress that will not cause failure.
You should look up 'factor of safety.'
This is the ratio of the strength to permissible ie maximum to permissible and is usually in the range 2.5 : 1 to 8 :1.