Sensitivity of Shear Strain and Shear Strain Rate on Machining Material for Aerospace Hot Parts Application

Shear strain is an indicator of degree of deformation of a material subjected to shear stress. The understanding of shear strain and shear strain rate at the primary shear zone during chip formation can be used to estimate the behaviour of materials under varying machining conditions. The aim of this study is to investigate the impact of metal cutting velocities and other cutting condition on shear strain and shear strain rate. Machining tests were conducted on a conventional lathe by varying the cutting condition at constant rake angle using Ti-6Al-4V workpiece. Restricted cutting forces were measured from which the shear strain and shear strain rate were evaluated. Results shows that average chip velocity is 0.365m/s, average shear velocity is 1.384m/s, and average cutting speed is 1.38m/s. Also, the average shear strain was 2.2034 and average shear strain rate 54.4533 s-1. Cutting speed and shear velocity influences shear strain and shear strain rate.