Cover Picture: Investigation on Impact Initiation Characteristics of Fluoropolymer-matrix Reactive Materials (Prop., Explos., Pyrotech. 6/2017)

2017 ◽  
Vol 42 (6) ◽  
pp. 573-573 ◽  
Author(s):  
Jie Zhou ◽  
Yuan He ◽  
Yong He ◽  
Chuan Ting Wang
Keyword(s):  
Reactive Materials ◽  
Impact Initiation

scholarly journals Bulk Density Homogenization and Impact Initiation Characteristics of Porous PTFE/Al/W Reactive Materials

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2271 ◽  
Author(s):  
Baoqun Geng ◽  
Haifu Wang ◽  
Qingbo Yu ◽  
Yuanfeng Zheng ◽  
Chao Ge
Keyword(s):  
Bulk Density ◽  
Testing System ◽  
Sintering Process ◽  
Structure Characteristics ◽  
Reactive Materials ◽  
Theoretical Maximum ◽  
Mesoscale Structure ◽  
Impact Initiation ◽  
Different Types ◽  
The Impact

In this research, the bulk density homogenization and impact initiation characteristics of porous PTFE/Al/W reactive materials were investigated. Cold isostatic pressed (CIPed) and hot temperature sintered (HTSed) PTFE/Al/W reactive materials of five different theoretical maximum densities were fabricated via the mixing/pressing/sintering process. Mesoscale structure characteristics of the materials fabricated under different molding pressures were compared while the effect of molding pressures on material bulk densities was analyzed as well. By using the drop weight testing system, effects of the theoretical maximum densities (TMDs), drop heights and molding pressures on the impact initiation characteristics were studied. Quantitatively, characteristic drop heights (H50) for different types of materials were obtained. The two most significant findings of this research are the density homogenization zone and the sensitivity transition zone, which would provide meaningful guides for further design and fabrication of reactive materials.

Investigation on Impact Initiation Characteristics of Fluoropolymer-matrix Reactive Materials

2017 ◽  
Vol 42 (6) ◽  
pp. 603-615 ◽  
Author(s):  
Jie Zhou ◽  
Yuan He ◽  
Yong He ◽  
Chuan Ting Wang
Keyword(s):  
Reactive Materials ◽  
Impact Initiation

scholarly journals Impact-Initiation Sensitivity of High-Temperature PTFE-Al-W Reactive Materials

Crystals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 30
Author(s):  
Tao Sun ◽  
Yuanfeng Zheng ◽  
Ying Yuan ◽  
Haifu Wang
Keyword(s):  
High Temperature ◽  
Temperature Interval ◽  
High Speed ◽  
Sample Temperature ◽  
Initiation Mechanism ◽  
Reactive Materials ◽  
Impact Initiation ◽  
The Difference ◽  
Sensitivity Changes ◽  
The Impact

Drop-weight tests were conducted to investigate the impact-initiation sensitivity of high-temperature PTFE-Al-W reactive materials. The test results show that the impact-initiation sensitivity of the materials more than doubles with increasing the sample temperature from 25 to 350 °C. Combined with the impact-induced initiation process recorded by high-speed video and the difference between reacted and unreacted residues, the crack-induced initiation mechanism was revealed. The rapid propagation of crack provides a high-temperature and aerobic environment where Al reacts violently to PTFE, which induces the initiation. Moreover, the influence of sample temperature on the sensitivity was discussed and analyzed. The analysis results indicate that the sensitivity shows a temperature interval effect, and 127 and 327 °C are the interval boundaries where the sensitivity changes significantly. The sensitivity may leaps at 127 °C and increases more rapidly in the temperature interval from 127 to 327 °C, but hardly changes after the temperature reaches 327 °C.

Meso-Scale Experimental & Numerical Studies for Predicting Macro-scale Performance of Advanced Reactive Materials (ARMs)

2015 ◽  
Author(s):  
Naresh Thadhani ◽  
Arun Gokhale ◽  
Jason Quenneville ◽  
Jennifer Breidenich ◽  
Manny Gonzales ◽  
...  
Keyword(s):  
Reactive Materials ◽  
Numerical Studies ◽  
Macro Scale ◽  
Meso Scale

scholarly journals Research on the reaction temperature of PTFE/Al reactive materials

2021 ◽  
Vol 804 (4) ◽  
pp. 042049
Author(s):  
Xuan Zou ◽  
Jingyuan Zhou ◽  
Xianwen Ran ◽  
Yiting Wu ◽  
Ping Liu ◽  
...  
Keyword(s):  
Reaction Temperature ◽  
Reactive Materials

scholarly journals An explosively-driven multi-flyer system for investigating fragment impact initiation of PBXs

2020 ◽  
Author(s):  
Patrick R. Bowden ◽  
John D. Yeager ◽  
Andrew M. Schmalzer ◽  
Joseph P. Lichthardt ◽  
Alexander H. Mueller
Keyword(s):  
Impact Initiation

Screening reactive materials as permeable barriers to treat lead and benzene contaminated groundwater

2015 ◽  
Vol 15 (3) ◽  
pp. 632-641 ◽  
Author(s):  
Franklin Obiri-Nyarko ◽  
Jolanta Kwiatkowska-Malina ◽  
Tomasz Kasela
Keyword(s):  
Brown Coal ◽  
Diatomaceous Earth ◽  
Deionized Water ◽  
Contaminated Groundwater ◽  
Contaminant Removal ◽  
Batch Experiments ◽  
Reactive Materials ◽  
Exchangeable Fraction ◽  
Permeable Barriers ◽  
Removal Efficiencies

Laboratory batch experiments were performed to: (i) select two individual and two mixtures of potential reactive materials for permeable barriers to treat groundwater contaminated with benzene and soluble lead (Pb2+); (ii) investigate the involved contaminant removal mechanisms; and (iii) determine the permeability and assess the environmental compatibility of the selected materials. Five individual reactive materials (zeolite, diatomaceous earth, brown coal, compost, and zero-valent iron as control) and four mixtures (compost:brown coal, compost:zeolite, compost:mulch, and mulch:diatomaceous earth) in different ratios were investigated. Benzene and Pb2+ were investigated separately using Pb2+/benzene spiked deionized water. Zeolite and brown coal were selected as individual materials for Pb and benzene based on their removal efficiencies. For the material mixtures, compost:brown coal (1:3) and compost:zeolite mixtures (1:3) were selected for Pb, whereas compost:zeolite (1:1) and compost:brown coal (1:5) were selected for benzene. The sequential extraction of Pb from these selected reactive materials showed that Pb was held mainly in the exchangeable fraction (52%–76%). Benzene was removed by biodegradation and sorption, with the latter contributing most to its removal (60%–99%). The selected materials were compatible with the environment considering the amounts of toxic metals leached from them, and their permeabilities were in the range of 4.2 × 10−5–2.14 × 10−3 m s−1.

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