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Study on Isostatic Pressing Method for Metal and Non-metal Mixed Powders Oriented to Energetic Materials
ZHANG Ke, HAN Mengwei, GE Zaizheng, WANG Guangyu, WU Feng, LIU Aijun, ZHENG Changjun
JPRMG ›› 2025, Vol. 45 ›› Issue (1) : 115-121.
PDF(2866 KB)
PDF(2866 KB)
Study on Isostatic Pressing Method for Metal and Non-metal Mixed Powders Oriented to Energetic Materials
({{custom_author.role_en}}), {{javascript:window.custom_author_en_index++;}}The quality of explosive charge is a key factor affecting the performance of artillery weapons, and the explosive charge is often a mixture of powders. To improve the quality of cylinders made by a mixture of metal and non-metal powders, the mechanical behavior of the cylinders was described using continuum plasticity theory, the Shima-Oyane model and the Ogden model were employed as the material constitutive models for the cylinders and the rubber sleeve, respectively. And a simulation model for the isostatic pressing of cylinders was developed utilizing the nonlinear finite element software MSC.Marc. Based on the simulation model, the forming mechanism of cylinders was explored, and a comparative study was conducted on the influence of isostatic pressing process parameters on the forming quality of the cylinders. The results indicated that the simulation model could effectively reflect the forming characteristics of the cylinders. The maximum pressure and it’s holding time of isostatic pressing were the key factors that influenced the quality of the cylinders. When the pressure was set at 240 MPa and the holding time exceeded 400 s, the overall relative density of the cylinders reached above 97%, with the density distribution difference was below 0.5%. The results of the isostatic pressing experiment verified the accuracy of the simulation analysis results. The cylinders with approximate length-to-diameter ratios of 5∶1 achieved a higher process standard and satisfied the process requirements.
isostatic pressing of explosive charge / finite element analysis / mixed powders / charge density {{custom_keyword}} /
Table 1 Revised parameters of Shima-Oyane model表1 修正后的Shima-Oyane模型参数 |
| | | | | | | | |
|---|---|---|---|---|---|---|---|
| 0 | 1 | 1 | 9.5 | 18 | -18 | 1 | -0.3 |
Table 2 Parameters of the Ogden model表2 Ogden模型参数 |
| Parameter | Value |
|---|---|
| | 0.242 751 70 |
| | 5.982 329 45 |
| | -7.169 788 95 |
| | 0.456 011 27 |
| | 0.004 567 31 |
| | 0.000 251 41 |
Fig.8 Results of isostatic pressure experiment and sampling scheme for inspection图8 等静压实验结果及检测取样方案 |
Table 3 Co of experimental and simulation results表3 实验结果与仿真结果对比 |
| Result | Diameter/mm | Height/mm | Average relative density of TMD/% |
|---|---|---|---|
| Simulation | 63.0 | 322.9 | 97.217 |
| Experiment | 62.43 | 331.6 | 97.41 |
| Relative error | 0.91 | 2.63 | 0.20 |
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本文采用高温加速老化的方法,通过测定RDX/AP/HTPB复合推进剂单轴拉伸力学性能、硬度、交联密度和线性燃速等参数随老化时间的变化,利用扫描电镜等实验手段,研究了RDX/AP/HTPB复合推进剂的老化。此外,还测得了这类推进剂的热失重曲线。结果表明,以RDX部分取代AP后,提高了推进剂的热稳定性。
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Fig.1 Finite element mesh model of cylinder and rubber sleeve
Table 1 Revised parameters of Shima-Oyane modelTable 2 Parameters of the Ogden modelFig.2 Displacement condition of the cylinderFig.3 Relative density distribution results of the cylinderFig.4 Relative density variation at different radial positions of the cylinderFig.5 Stress distribution in the cylinderFig.6 Density variation at the center of the cylinderFig.7 Variation of density distribution difference in the cylinder as a function of pressing timeFig.8 Results of isostatic pressure experiment and sampling scheme for inspectionTable 3 Co of experimental and simulation results/
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. AlN-BN composites with the ratio of nAlN: nBN = 75:25 were prepared at 1600 ℃, 90 MPa and a dwell time of 3 h by HIP, achieving density of 98.03%, thermal conductivity of 77.29 W/(m·K) and a volume resistivity of 1.35 × 1015 Ω·cm.
