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Experimental and Numerical Analysis of Single Screw Extrusion Process for Thermoplastic PBX Based on PVT Properties
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2022-07-05 , DOI: 10.1002/prep.202200093 Yufan Bu 1 , chun yan chen 2 , Fan Jiang 2 , Xiaofeng Wang 1 , Defu Che 3 , Hai Nan 1
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2022-07-05 , DOI: 10.1002/prep.202200093 Yufan Bu 1 , chun yan chen 2 , Fan Jiang 2 , Xiaofeng Wang 1 , Defu Che 3 , Hai Nan 1
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Much of surplus ammunition stockpile inevitably requires demilitarized processing technology in the explosives industry. For the safe waste treatment and recycle, the thermoplastic polymer bonded explosive (PBX) can effectively reduce the military cost and non-conforming products. In addition, the thermoplastic PBX has excellent application prospect as the future explosive due to the good mechanical properties and insensitivity. However, for high solid content, most of thermoplastic PBXs still maintain a considerable viscosity even in high-temperature melting state, rendering traditional casting process unsuitable. In this study, a measuring method was adopted to accurately obtain the correlation of Pressure-Volume-Temperature (PVT) for the simulative materials of thermoplastic PBX at first. The equations of state for PVT and viscosity model were then created, which are of great significance in single screw extrusion. An experiment system of single screw extrusion was designed to implement the molding process considering the poor liquidity problem of the thermoplastic materials. Excellent molding stability (ρ<0.5 % variation) was achieved for the extrusion system. Moreover, a numerical investigation was also performed. Good agreements were yielded by comparing the simulation data and experimental results. The effects of operational parameters, i. e., the entrance pressure, barrel temperature and rotation speed on molding process of the thermoplastic materials were investigated in detail. The wall shear stress decreases with the feed inlet well sealed whereas the maximum temperature rise increases a little due to limited thermal diffusion. Either increasing temperature or decreasing rotation speed is beneficial to overall process safety. However, production cycle and attainable molding density also need to be considered at the same time. Furthermore, the process parameters should be optimized on the basis of the PVT and viscosity properties of material in practice. The investigations above can be a better guidance for the development and implementation of thermoplastic PBXs molding process.
中文翻译：
基于 PVT 特性的热塑性 PBX 单螺杆挤出工艺的实验和数值分析
大部分过剩弹药库存不可避免地需要炸药行业的非军事化加工技术。对于安全的废物处理和回收利用，热塑性聚合物粘结炸药（PBX）可以有效降低军用成本和不合格品。此外，热塑性PBX由于具有良好的机械性能和不敏感性，作为未来的炸药具有良好的应用前景。然而，对于高固含量，大多数热塑性PBX即使在高温熔融状态下仍然保持相当大的粘度，使得传统的铸造工艺不适合。本研究首先采用一种测量方法来准确获得热塑性PBX模拟材料的压力-体积-温度(PVT)相关性。然后建立了PVT的状态方程和粘度模型，这对单螺杆挤出具有重要意义。考虑到热塑性材料流动性差的问题，设计了单螺杆挤出实验系统来实施成型工艺。优异的成型稳定性（ρ挤出系统实现了<0.5%的变化）。此外，还进行了数值研究。通过比较模拟数据和实验结果，得出了良好的一致性。操作参数的影响，i。例如，详细研究了热塑性材料成型过程的入口压力、料筒温度和转速。随着进料口密封良好，壁面剪切应力降低，而由于热扩散受限，最大温升略有增加。提高温度或降低转速都对整个过程安全性有利。但是，还需要同时考虑生产周期和可达到的成型密度。此外，工艺参数应根据实际材料的 PVT 和粘度特性进行优化。上述研究可以为热塑性PBXs成型工艺的开发和实施提供更好的指导。
更新日期：2022-07-05
中文翻译：
基于 PVT 特性的热塑性 PBX 单螺杆挤出工艺的实验和数值分析
大部分过剩弹药库存不可避免地需要炸药行业的非军事化加工技术。对于安全的废物处理和回收利用，热塑性聚合物粘结炸药（PBX）可以有效降低军用成本和不合格品。此外，热塑性PBX由于具有良好的机械性能和不敏感性，作为未来的炸药具有良好的应用前景。然而，对于高固含量，大多数热塑性PBX即使在高温熔融状态下仍然保持相当大的粘度，使得传统的铸造工艺不适合。本研究首先采用一种测量方法来准确获得热塑性PBX模拟材料的压力-体积-温度(PVT)相关性。然后建立了PVT的状态方程和粘度模型，这对单螺杆挤出具有重要意义。考虑到热塑性材料流动性差的问题，设计了单螺杆挤出实验系统来实施成型工艺。优异的成型稳定性（ρ挤出系统实现了<0.5%的变化）。此外，还进行了数值研究。通过比较模拟数据和实验结果，得出了良好的一致性。操作参数的影响，i。例如，详细研究了热塑性材料成型过程的入口压力、料筒温度和转速。随着进料口密封良好，壁面剪切应力降低，而由于热扩散受限，最大温升略有增加。提高温度或降低转速都对整个过程安全性有利。但是，还需要同时考虑生产周期和可达到的成型密度。此外，工艺参数应根据实际材料的 PVT 和粘度特性进行优化。上述研究可以为热塑性PBXs成型工艺的开发和实施提供更好的指导。
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