the shaft in Figure 251 was taken from a mill transfe r chai

the shaft in Figure 2.51 was taken from a mill transfe

r chain that was frequently overloaded, causing the

shaft (made of low-carbon steel) to fail by torsion

sheer. It has obviously been loaded in torsion beyond its

elastic limit into the plastic range and has taken

a permanent set. Since the sprocket and bearing bores

are not easily changed to substitute

a larger diameter shaft, what type of

replacement shaft will solve the

problem? What different mechanical properties must it

possess so it will not again fail by torsion sheer?

for the figure folow below link

https://books.google.com.pk/books?id=v9aIDv1hOP8C&pg=PA51&dq=the+shaft+in+Figure+2.51+was+taken+from+a+mill+transfer+chain+that+was+frequently+overloaded,+causing+the+shaft+(made+of+low-carbon+steel)+to+fail+by+torsion&hl=en&sa=X&ved=0ahUKEwjZuP6Wj-rRAhUSahoKHRs6CmQQ6AEIGTAA#v=onepage&q=the%20shaft%20in%20Figure%202.51%20was%20taken%20from%20a%20mill%20transfer%20chain%20that%20was%20frequently%20overloaded%2C%20causing%20the%20shaft%20(made%20of%20low-carbon%20steel)%20to%20fail%20by%20torsion&f=false

Solution

As the diameter of the shaft can not be changed for a given sproket and bearing bore, it is recomended to replace the low-carbon steel shaft to another shaft of different material which can withstand this overloading.

the material of the shaft should have a higher value of shear modulus in order to avoid further failure.