A biconical liner was optimized to improve its penetration ability. Its formation and pene- tration mechanism was studied through numerical simulation and experiments. And the influence of different liner geometry siz...A biconical liner was optimized to improve its penetration ability. Its formation and pene- tration mechanism was studied through numerical simulation and experiments. And the influence of different liner geometry sizes on the jet performance was analyzed using the orthogonal method. The liner formed the high-speed jet with an explosively formed projectile. The small angle 2a remarkably influenced the jet speed which was inversely proportional to 2a. And the liner thickness t＇ and large angle 2β had highly significant effect on the projectile speed. The liner was optimized at t＇ = 0. 14 cm, 2α = 50°, 2β = 135°, N = 0. 4 or 0. 5, when its jet speed respectively is at 6 613 m/s and 6 839 m/s and projectile speed is at 2 247 m/s and 2 095 m/s, steel target penetration is at 8. 24 cm and 8. 31 cm, and aperture is in 2.12 cm and 2.08 cm. The results show that target is penetrated by the high-speed jet and high-speed projectile resulting into double damages. The penetration ability is improved greatly.展开更多
目的:评估短种植体不同冠根比对种植体周骨改建的影响。方法:选取2011年1月~2013年6月后牙区种植患者27例,共69枚Bicon短种植体。经过5年功能负载后,通过影像学资料分析边缘骨吸收(marginal bone loss,MBL)、种植体周骨灰度值(grey-scal...目的:评估短种植体不同冠根比对种植体周骨改建的影响。方法:选取2011年1月~2013年6月后牙区种植患者27例,共69枚Bicon短种植体。经过5年功能负载后,通过影像学资料分析边缘骨吸收(marginal bone loss,MBL)、种植体周骨灰度值(grey-scale value,GSV)的改变与冠根比(crown-to-implant ratio,CIR)关系。结果:纳入研究的69枚Bicon种植体,经过(65±9)个月的功能负载,成功率为94.2%。按CIR进行分组,MBL、△GSV与CIR之间未发现显著相关(P>0.05);仅有2枚植体发生崩瓷,机械并发症比较差异无统计学意义(P>0.05)。结论:Bicon短种植体CIR对种植体周MBL、GSV改变没有明显影响,骨组织具有足够的改建活性以应对更大的应力刺激。高CIR未导致更多的机械并发症和种植体失败。展开更多
基金Supported by the National Natural Science Foundation of China(51174183)the Anhui Natural Science Foundation of China(1508085ME85)
文摘A biconical liner was optimized to improve its penetration ability. Its formation and pene- tration mechanism was studied through numerical simulation and experiments. And the influence of different liner geometry sizes on the jet performance was analyzed using the orthogonal method. The liner formed the high-speed jet with an explosively formed projectile. The small angle 2a remarkably influenced the jet speed which was inversely proportional to 2a. And the liner thickness t＇ and large angle 2β had highly significant effect on the projectile speed. The liner was optimized at t＇ = 0. 14 cm, 2α = 50°, 2β = 135°, N = 0. 4 or 0. 5, when its jet speed respectively is at 6 613 m/s and 6 839 m/s and projectile speed is at 2 247 m/s and 2 095 m/s, steel target penetration is at 8. 24 cm and 8. 31 cm, and aperture is in 2.12 cm and 2.08 cm. The results show that target is penetrated by the high-speed jet and high-speed projectile resulting into double damages. The penetration ability is improved greatly.
文摘目的:评估短种植体不同冠根比对种植体周骨改建的影响。方法:选取2011年1月~2013年6月后牙区种植患者27例,共69枚Bicon短种植体。经过5年功能负载后,通过影像学资料分析边缘骨吸收(marginal bone loss,MBL)、种植体周骨灰度值(grey-scale value,GSV)的改变与冠根比(crown-to-implant ratio,CIR)关系。结果:纳入研究的69枚Bicon种植体,经过(65±9)个月的功能负载,成功率为94.2%。按CIR进行分组,MBL、△GSV与CIR之间未发现显著相关(P>0.05);仅有2枚植体发生崩瓷,机械并发症比较差异无统计学意义(P>0.05)。结论:Bicon短种植体CIR对种植体周MBL、GSV改变没有明显影响,骨组织具有足够的改建活性以应对更大的应力刺激。高CIR未导致更多的机械并发症和种植体失败。
