Mechanical behavior of PBX with different HMX crystal size during die pressing: Experimental study and DEM simulation

Guo, Yuchen; Li, Rui; Chen, Pengwan; Zhou, Bo; Hu, Gaoyang; Han, Chao; Lv, Kezhen; Zhu, Shun‐Peng

doi:10.1016/j.compscitech.2022.109378

Cited by 12 publications

(4 citation statements)

References 33 publications

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“…It was caused by extra energy dissipation from PCL crystals breakage and disentanglement of PCL chain and SSE network during the low‐speed impact process. [ 49,50 ] Nevertheless, PCLE‐50% presented higher F t max than SSE when impacted from the height of above 300 mm due to structural failure of SSE. For example, SSE was seriously damaged by impacting once from 500 mm (Figure S18, Supporting Information) and a large crack was formed after impacting twice.…”

Section: Resultsmentioning

confidence: 99%

Bio‐Inspired Semi‐Active Safeguarding Design with Enhanced Impact Resistance via Shape Memory Effect

Wang

Zhou

et al. 2023

Adv Funct Materials

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Inspired by creatures reducing impact damage, a novel semi-active protection strategy to enhance impact resistance through structural adjustment is proposed. The heat-activated shape memory composites (PCLE) consisting of polycaprolactone (PCL) and shear stiffening elastomer are first prepared. The PCLE with 50 wt.% PCL (PCLE-50%) presents tensile strength of 0.46 MPa, fracture strain of 148%, high shape fixity and recovery rates (97.9% and 91.1%), and stable shape-memory repeatability. Furthermore, various PCLE-50%-based structures are fabricated, which show reinforced anti-impact performance after shape-shifting. Loading from 300 mm, the maximum drop hammer impact force of no protection, PCLE-50%, and deformed assembled single-branch structure are 3.98 kN, 1.75 kN, and 0.93 kN, respectively. Additionally, assembled complex structures also exhibit exceptional energy absorption properties. Ultimately, intelligent clothing is successfully manufactured. Besides good anti-impact effect, the clothing shows excellent thermal insulation capabilities whose surface temperature is 31.7 °C after heating for 600 s at 42 °C. This study provides an innovative means to develop deformable, wearable, and intelligent protective devices.

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Section: Resultsmentioning

confidence: 99%

Bio‐Inspired Semi‐Active Safeguarding Design with Enhanced Impact Resistance via Shape Memory Effect

Wang

Zhou

et al. 2023

Adv Funct Materials

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“…This is because that both sides of the fiber are completely cured, and the volume continues to shrink due to the temperature drop. This indicates a high strain in the most central explosive at the completion of solidification, which may directly cause cracks and subsequent strain release according to fracture theory [31]. Based on the knowledge of the mechanical properties of the explosive, it is possible to know whether the product has been damaged during the melting and casting process according to the process monitoring strain.…”

Section: Section Bmentioning

confidence: 99%

Embedded measurement of process monitoring in melt-cast explosive based on distributed optical fiber sensing and numerical verification

Deng,

Sun,

Guo

et al. 2023

Meas. Sci. Technol.

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The solidification sequence during the solidification of fusion-cast explosives is an important parameter for the optimization of the manufacturing process, which can be analyzed by using numerical simulation experiments. However, the numerical simulations are not totally reliable due to the inherent errors in the algorithms and parameters. To address this issue, a measurement method is proposed to monitor the solidification process based on the embedded method of distributed fiber optic sensing. And a method is developed to identify the solid–liquid phase change interface region, which can be effectively demodulated and analyzed for sensing data. The experimental results were verified by using numerical simulations based on casting simulation software and compared. It can be found that the total solidification time and pattern of both are relatively consistent. However, some of the solidification characteristics in the numerical simulation are lack of precision due to the inaccuracy of the heat transfer parameters.

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“…To achieve optimal loadability and performance in formulations, the availability of HMX particles with impeccable quality, compact, preferably spherical shapes, and a diverse range of sizes is imperative [40] , [41] . Different application scenarios impose unique demands on the crystal size distribution of HMX, with coarse HMX crystals (300 μm in size) dominating PBX formulations to achieve unparalleled loadability and compacting density [42] . Conversely, finer or very fine HMX is indispensable for propellant formulations or primary explosives, where higher energy output is paramount [43] .…”

Section: Introductionmentioning

confidence: 99%

Facilitating polymorphic crystallization of HMX through ultrasound and trace additive assistance

Li,

Huang

et al. 2024

Ultrasonics Sonochemistry

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Mechanical behavior of PBX with different HMX crystal size during die pressing: Experimental study and DEM simulation

Cited by 12 publications

References 33 publications

Bio‐Inspired Semi‐Active Safeguarding Design with Enhanced Impact Resistance via Shape Memory Effect

Bio‐Inspired Semi‐Active Safeguarding Design with Enhanced Impact Resistance via Shape Memory Effect

Embedded measurement of process monitoring in melt-cast explosive based on distributed optical fiber sensing and numerical verification

Facilitating polymorphic crystallization of HMX through ultrasound and trace additive assistance

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