摘要
为解决含超细粉体炸药模拟物中各组分的均匀分散混合问题,采用双螺杆挤出机试验及ANSYS有限元流场模拟分析,首先用平板流变仪测得炸药模拟物在特定温度下的流变参数,运用ANSYS的Fluid Dynamics模块对炸药模拟物在同向双螺杆挤出机的混合挤出流场进行模拟,以累积最大拉伸速率、加权平均剪切应力表征混合能力的大小。基于模拟结果,用同向双螺杆挤出机对炸药模拟物的混合流场进行实验,对经历不同混合流场的炸药模拟物进行SEM扫描电镜分析。结果表明,大导程和反向的螺纹元件能够提供较大的剪切和拉伸作用,有利于炸药模拟物的分散混合。
In order to understand the dispersion property of the simulant explosive composites containing superfine powder particles during twin-screw extrusion, experimental analysis and simulations were conducted through a co- rotating twin screw extruder and ANSYS. By means of a rotating rheometer, rheological parameters of these typical stimulant explosive composites were measured in advance. Several mixing index, such as cumulated maxing stretc- hing rates, weighted average shear stress, were considered as factors affecting the mixium performance of the twin- screw extruder. Meanwhile, the mixing morphology was also observed through a scanning electron microscope （SEM）. All the results showed that the big helical pitch screw element and reverse rotary screw element are helpful to generate a much more significant tensile and shear effect, which were positive to enhance the dispersive proper ties.
出处
《火炸药学报》
EI
CAS
CSCD
北大核心
2014年第5期85-90,共6页
Chinese Journal of Explosives & Propellants
关键词
应用力学
炸药
超细粉体
双螺杆挤出机
applied dynamics
explosive
superfine powder
mixing
co-rotating twin screw extruder
