youngs modulus and forging
youngs modulus and forging
(OP)
Hi
I'm currently reverse engineering a gas turbine inlet stub shaft, which I know has been produced by forging. Due to the small amount of these parts rquired per year it has been suggested to use rolled bar and machine to the finished size with heat treatment and so on.
The question I have is that in the original the flow lines in the material wil tend to follow its shape however in the machined part the will not. Would this lead to a significant reduction in Youngs modulus locally at a change in cross section? Does anyone know of any references to this type of query?
Thanks in advance for any suggestions.
allan
I'm currently reverse engineering a gas turbine inlet stub shaft, which I know has been produced by forging. Due to the small amount of these parts rquired per year it has been suggested to use rolled bar and machine to the finished size with heat treatment and so on.
The question I have is that in the original the flow lines in the material wil tend to follow its shape however in the machined part the will not. Would this lead to a significant reduction in Youngs modulus locally at a change in cross section? Does anyone know of any references to this type of query?
Thanks in advance for any suggestions.
allan





RE: youngs modulus and forging
The real issue here is fatigue. This is similar to auto crank shafts. There is a reason that racing cranks are forged, even though there are only manufacture a few hundred a year.
Think of the cost, and think of the risk. What happens when one of these fails?
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: youngs modulus and forging
Depending on the geometry and function of the shaft it may work, especially for smaller diameter shafts with small transitions or steps. If you have large geometric changes or abrupt steps along the length of the shaft, I would probably stay with the forging.
RE: youngs modulus and forging
If you were to purchase a shape specific forging you would have the opportunity of specifying the minimum reduction ratio which would give some certainty of soundness. You do not have that option with forged bar.
RE: youngs modulus and forging
RE: youngs modulus and forging