Let me start by saying I am not a composite engineer, nor mechanical engineer, but a frustrated plant operations manager trying to walk between multiple disciplines and form some degree of opinion based on input from aforementioned engineers. We are testing a composite tube with metal ends attached. This part is placed in a torque machine in an effort to derive  multiple sets of data for future development. In this process we have been calculating Young's modulus. My staff tells me they are only considering the area between the two metal ends for the part length. My question is should we consider the entire length which would be the inclusion of the area that has metal glued to it? Hope that makes sense.