d = ∫ dd =  ∫ ( P / (AE)) dx

 

If  P  and/or  A  is a function of x, we will need to evaluate an integral..

 

If  P,  A  and  E  are all constant, then

 

             d = ( P / (AE)) ∫ dx  =  (PL) / (AE)

 

If  P,  A  and  E  are all constant over sections of the length, then

 

             d = S ( (PL) / (AE) )_i

 

 

Lecture #6, page 2                   Back