In this paper,we give all-sided pastic analysis of the rectangular slab with three edges simply-supported and other free.Here we discuss the following four cases:(1)The uniformly distributedload over the area a slab.(...In this paper,we give all-sided pastic analysis of the rectangular slab with three edges simply-supported and other free.Here we discuss the following four cases:(1)The uniformly distributedload over the area a slab.(2).A concentrated load act at midpoint of free edges slab.(3)A concen-trated load act at the center a slab.(4)The line load act along free edge of slab.展开更多
Several orthogonal cutting experiments were carried out on SiC reinforced aluminium composites. In the cutting process, photos of the chip bottom specimen SEM were gotten with the aid of ‘quick stop tool device’. Ac...Several orthogonal cutting experiments were carried out on SiC reinforced aluminium composites. In the cutting process, photos of the chip bottom specimen SEM were gotten with the aid of ‘quick stop tool device’. According to the photos, the build up edge (BUE) can be produced in circumferential cutting experiments. In comparison with carbon steel BUE, aluminium composites BUE is like a wedge in shape, and its development mechanism is mechanical enchasing other than "cold welding". In addition to the above mentioned conclusions, the minishing BUE height H b is also analyzed.展开更多
In this study, a 3D finite element model is developed to investigate the drilling process of AISI 1045 steel, and particularly, the heat and wear on the drill faces. To model drill wear, a modified Usui flank wear rat...In this study, a 3D finite element model is developed to investigate the drilling process of AISI 1045 steel, and particularly, the heat and wear on the drill faces. To model drill wear, a modified Usui flank wear rate is used. Experiments are used for the verification of the simulated model and the evaluation of the surface rough- ness and built-up edge. A comparison of the predicted and experimental thrust forces and flank wear rates revealed that the predicted values had low errors and were in good agreement with the experimental values, which showed the utility of the developed model for further analysis. Accordingly, a heat analysis indicated that approximately half the generated heat in the cutting zone was conducted to the drill bit. Furthermore, material adhesion occurred in localized heat areas to a great extent, thus resulting in wear acceleration. A maximum flank wear rate of 0.026 1 mm/s was observed when the rotary speed and feed rate were at the lowest and highest levels, respectively. In the reverse cutting condition, a minimum flank wear rate of 0.016 8 mm/s was observed.展开更多
文摘In this paper,we give all-sided pastic analysis of the rectangular slab with three edges simply-supported and other free.Here we discuss the following four cases:(1)The uniformly distributedload over the area a slab.(2).A concentrated load act at midpoint of free edges slab.(3)A concen-trated load act at the center a slab.(4)The line load act along free edge of slab.
文摘Several orthogonal cutting experiments were carried out on SiC reinforced aluminium composites. In the cutting process, photos of the chip bottom specimen SEM were gotten with the aid of ‘quick stop tool device’. According to the photos, the build up edge (BUE) can be produced in circumferential cutting experiments. In comparison with carbon steel BUE, aluminium composites BUE is like a wedge in shape, and its development mechanism is mechanical enchasing other than "cold welding". In addition to the above mentioned conclusions, the minishing BUE height H b is also analyzed.
文摘In this study, a 3D finite element model is developed to investigate the drilling process of AISI 1045 steel, and particularly, the heat and wear on the drill faces. To model drill wear, a modified Usui flank wear rate is used. Experiments are used for the verification of the simulated model and the evaluation of the surface rough- ness and built-up edge. A comparison of the predicted and experimental thrust forces and flank wear rates revealed that the predicted values had low errors and were in good agreement with the experimental values, which showed the utility of the developed model for further analysis. Accordingly, a heat analysis indicated that approximately half the generated heat in the cutting zone was conducted to the drill bit. Furthermore, material adhesion occurred in localized heat areas to a great extent, thus resulting in wear acceleration. A maximum flank wear rate of 0.026 1 mm/s was observed when the rotary speed and feed rate were at the lowest and highest levels, respectively. In the reverse cutting condition, a minimum flank wear rate of 0.016 8 mm/s was observed.
