Yamamuro-Penumadu-Campbell Model

Yamamuro, Penumadu, and Campbell [5] developed another model with a force R of the same magnitude as A but acting at a skew angle a, which is an adjustable parameter. The form of the analysis is similar to that by Tadmor and Klein [7] and Campbell and Dontula [1] in nature. Fig. A5.6 illustrates forces for the model and the changes made to Fig. A5.3. The following is an extended list of assumptions they made  

The relationship between the normal stress, a acting on the barrel and screw and the down-channel pressure, P, is constant and cross-anisotropic (Oj = Oy) [6]. 

Forces for Yamamuro-Penumadu-Campbell Model F, = forwarding force at the barrel wall and centered on surface. p2= force due to pressure and centered on surface. 

Fs= retarding force and centered on surface. p4= retarding force and centered on surface. 

R = force has magnitude equal to FI but acting on the pushing surface at angle a. 

---

Figure A5.6 Force diagram for the Yamamuro-Penumadu-Campbell model...

---