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Career Discussions
Ron Olson
R & D, Aviation
The Best Aviation Company In The World, USA, Joined Feb 2005, 23

Ron Olson

R & D, Aviation
The Best Aviation Company In The World,
USA,
Joined Feb 2005
23
07:39 Jul-20-2005
Fatigue vs. Stress

Is stress the same thing as fatigue? I thought they were the same. Any engineers care to take this one? Thank you.


    
 
 Reply 
 
Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1268

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1268
03:31 Jul-21-2005
Re: Fatigue vs. Stress
I am not an engineer but the definitions are commonly available to those in NDT.
Stress: force per unit area
Fatigue: cyclic application of stress

Whereas fatigue is the process, the result is often fatigue failure. In this type of failure maximum stresses may be below the yield stress.

Ed

----------- Start Original Message -----------
: Is stress the same thing as fatigue? I thought they were the same. Any engineers care to take this one? Thank you.
------------ End Original Message ------------




    
 
 Reply 
 
John Brunk
Engineering, NDT Level III
Self employed, part-time, USA, Joined Oct 1999, 160

John Brunk

Engineering, NDT Level III
Self employed, part-time,
USA,
Joined Oct 1999
160
09:36 Jul-21-2005
Re: Fatigue vs. Stress
----------- Start Original Message -----------
: Is stress the same thing as fatigue? I thought they were the same. Any engineers care to take this one? Thank you.
------------ End Original Message ------------

Fatigue is often used to mean the tendency of a material or object to break as the result of repeated or cyclic stress, as for example an expected fatigue life of 250,000 cycles. Stress is essentially the same thing as force, as in stress-strain curve. Fatigue cracking is the result of cyclic stress such as repeated bending and straightening, flexing, taking off and landing, etc.



    
 
 Reply 
 
John Brunk
Engineering, NDT Level III
Self employed, part-time, USA, Joined Oct 1999, 160

John Brunk

Engineering, NDT Level III
Self employed, part-time,
USA,
Joined Oct 1999
160
09:37 Jul-21-2005
Re: Fatigue vs. Stress
----------- Start Original Message -----------
: Is stress the same thing as fatigue? I thought they were the same. Any engineers care to take this one? Thank you.
------------ End Original Message ------------

Fatigue is often used to mean the tendency of a material or object to break as the result of repeated or cyclic stress, as for example an expected fatigue life of 250,000 cycles. Stress is essentially the same thing as force, as in stress-strain curve. Fatigue cracking is the result of cyclic stress such as repeated bending and straightening, flexing, taking off and landing, etc.



    
 
 Reply 
 

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