Fused deposition modeling(FDM) is one of the latest rapid prototyping techniques in which parts can be manufactured at a fast pace and are manufactured with a high accuracy. This research work is carried out to study ...Fused deposition modeling(FDM) is one of the latest rapid prototyping techniques in which parts can be manufactured at a fast pace and are manufactured with a high accuracy. This research work is carried out to study the friction and wear behavior of parts made of newly developed Nylon6-Fe composite material by FDM. This work also involves the comparison of the friction and wear characteristics of the Nylon6-Fe composite with the existing acrylonitrile butadiene styrene(ABS) filament of the FDM machine. This Is carried out on the pin on disk setup by varying the load(5, 10, 15 and 20 N) and speed(200 and 300 r/min). It is concluded that the newly developed composite is highly wear resistant and can be used in industrial applications where wear resistance is of paramount importance. Morphology of the surface in contact with the Nylon6-Fe composite and ABS is also carried out.展开更多
3D microstructures of Fe–6.5%Si(mass fraction) alloys prepared under different cooling conditions were simulated via finite element-cellular automaton(CAFE) method. The simulated results were compared to experimental...3D microstructures of Fe–6.5%Si(mass fraction) alloys prepared under different cooling conditions were simulated via finite element-cellular automaton(CAFE) method. The simulated results were compared to experimental results and found to be in accordance. Variations in the temperature field and solid-liquid region, which plays important roles in determining solidification structures, were also examined under various cooling conditions. The proposed model was utilized to determine the effects of Gaussian distribution parameters to find that the lower the mean undercooling, the higher the equiaxed crystal zone ratio; also, the larger the maximum nucleation density, the smaller the grain size. The influence of superheat on solidification structure and columnar to equiaxed transition(CET) in the cast ingot was also investigated to find that decrease in superheat from 52 K to 20 K causes the equiaxed crystal zone ratio to increase from 58.13% to 65.6%, the mean gain radius to decrease from 2.102 mm to 1.871 mm, and the CET to occur ahead of schedule. To this effect, low superheat casting is beneficial to obtain finer equiaxed gains and higher equiaxed dendrite zone ratio in Fe–6.5%Si alloy cast ingots.展开更多
当今IP路由器的一个发展趋势是控制器(Con tro l E lem en t,CE)与转发器(Forw ard ing E lem en t,FE)的分离(Forw ard ing and Con tro l E lem en t Separation)。基于控制器和转发器分离的IP路由器比传统模式的IP路由器具有更高的...当今IP路由器的一个发展趋势是控制器(Con tro l E lem en t,CE)与转发器(Forw ard ing E lem en t,FE)的分离(Forw ard ing and Con tro l E lem en t Separation)。基于控制器和转发器分离的IP路由器比传统模式的IP路由器具有更高的可配置性和灵活性,更容易满足新业务对网络提出的新要求,从根本上解决IP路由器的Q oS问题。控制器在IP路由器中至关重要,他通过向转发器发送控制消息来控制整个路由器的动作,并且及时反映转发器的属性信息。对基于ForCES(Forw ard ing and Con tro l E lem en t Separation)结构的IP路由器中控制器进行了研究与实现,重点介绍网络件(N etw orkE lem en t,NE)信息描述的实现原理和逻辑功能块(Log ica l Function B lock,LFB)拓扑结构图形化显示的实现原理,最后给出了测试结果。展开更多
基金PTU Jalandhar,Manufacturing Research Lab GNDEC,Ludhiana and DST GOI for financial support
文摘Fused deposition modeling(FDM) is one of the latest rapid prototyping techniques in which parts can be manufactured at a fast pace and are manufactured with a high accuracy. This research work is carried out to study the friction and wear behavior of parts made of newly developed Nylon6-Fe composite material by FDM. This work also involves the comparison of the friction and wear characteristics of the Nylon6-Fe composite with the existing acrylonitrile butadiene styrene(ABS) filament of the FDM machine. This Is carried out on the pin on disk setup by varying the load(5, 10, 15 and 20 N) and speed(200 and 300 r/min). It is concluded that the newly developed composite is highly wear resistant and can be used in industrial applications where wear resistance is of paramount importance. Morphology of the surface in contact with the Nylon6-Fe composite and ABS is also carried out.
基金Project(2012AA03A505)supported by the High-Tech Research and Development Program of ChinaProject(51474023)supported by the National Natural Science Foundation of China
文摘3D microstructures of Fe–6.5%Si(mass fraction) alloys prepared under different cooling conditions were simulated via finite element-cellular automaton(CAFE) method. The simulated results were compared to experimental results and found to be in accordance. Variations in the temperature field and solid-liquid region, which plays important roles in determining solidification structures, were also examined under various cooling conditions. The proposed model was utilized to determine the effects of Gaussian distribution parameters to find that the lower the mean undercooling, the higher the equiaxed crystal zone ratio; also, the larger the maximum nucleation density, the smaller the grain size. The influence of superheat on solidification structure and columnar to equiaxed transition(CET) in the cast ingot was also investigated to find that decrease in superheat from 52 K to 20 K causes the equiaxed crystal zone ratio to increase from 58.13% to 65.6%, the mean gain radius to decrease from 2.102 mm to 1.871 mm, and the CET to occur ahead of schedule. To this effect, low superheat casting is beneficial to obtain finer equiaxed gains and higher equiaxed dendrite zone ratio in Fe–6.5%Si alloy cast ingots.
文摘当今IP路由器的一个发展趋势是控制器(Con tro l E lem en t,CE)与转发器(Forw ard ing E lem en t,FE)的分离(Forw ard ing and Con tro l E lem en t Separation)。基于控制器和转发器分离的IP路由器比传统模式的IP路由器具有更高的可配置性和灵活性,更容易满足新业务对网络提出的新要求,从根本上解决IP路由器的Q oS问题。控制器在IP路由器中至关重要,他通过向转发器发送控制消息来控制整个路由器的动作,并且及时反映转发器的属性信息。对基于ForCES(Forw ard ing and Con tro l E lem en t Separation)结构的IP路由器中控制器进行了研究与实现,重点介绍网络件(N etw orkE lem en t,NE)信息描述的实现原理和逻辑功能块(Log ica l Function B lock,LFB)拓扑结构图形化显示的实现原理,最后给出了测试结果。
