A titanium $(E=110$GPa $)$ hip implant stem with a circular crosssection $(L=250mm,d=15mm)$ is subjected to an axial compressive load of $F=8000N.$ Due to a small surface defect near the head of the implant, there is a stress concentration factor $K=2\mathrm{.}2$ at that point. Determine the total deformation of the implant, assuming the average stress can be assumed at a distance greater than $2$ d from the notch.