Topic: Manufacturing Engineering
The basis of slip line field theory in metal cutting is
- A. Merchant theory
- B. Lee and Shaffer theory
- C. Ernst-Merchant theory
- D. None of these
Answer: B. Lee and Shaffer theory
Explanation: Slip line field theory in metal cutting is the basis of the 'Lee and Shaffer theory'. According to this theory, $\phi = \frac{\pi}{4} + \alpha - \beta$. It assumes that the material being cut behaves like an ideal plastic with no strain hardening and the shear plane represents a direction of maximum shear stress.