introduction: nowadays,  considerable developments  in  the field  of  radiotherapy have  been  achieved.  they  include  the  advances  made  in  the  equipments  and  treatment  planning  techniques  which  require  highly complex calculations. such achievements have made it possible to treat cancer patients not only  with  higher  radiation  dose  but  also  with  higher  precision  and  con...

A semi-empirical elasto-plastic constitutive model with a hyperbolic stress-strain curve was developed the goal of predicting seismic compression unsaturated sands in funicular regime soil-water retention (SWRC) during undrained cyclic shearing. Using flow rule derived from energy considerations, evolution plastic volumetric strain (seismic compression) predicted shear strains hysteretic curve....

Servo press technology is gaining attention because its punch motion curve offers greater formability than that of a conventional stamping press. This study investigated the effect curves on circular cup extrusion–drawing process. Various were analyzed, and optimal for application was determined. Both process spring back U-shaped sheet metal investigated. In process, (Case A) three servo (Cases...

The mechanical response of Polyethylene Terephthalate (PET) in elongation is strongly dependent on temperature, strain and strain rate. Near the glass transition temperature Tg, the stress-strain curve presents a strain softening effect vs strain rate but a strain hardening effect vs strain under conditions of large deformations. The main goal of this work is to propose a viscoelastic model to ...

The mechanical response of Polyethylene Terephthalate (PET) in elongation is strongly dependent on temperature, strain and strain rate. Near the glass transition temperature Tg, the stress-strain curve presents a strain softening effect vs strain rate but a strain hardening effect vs strain under conditions of large deformations. The main goal of this work is to propose a viscoelastic model to ...