scholarly journals Experimental study on the initiation and energy release behavior of polymer bonded explosive materials

2017 ◽  
Author(s):  
Wei Zhang ◽  
Xuanming Cai ◽  
Nan Ye ◽  
Yubo Gao
Keyword(s):  
Experimental Study ◽  
Energy Release ◽  
Release Behavior ◽  
Explosive Materials

Experimental study of accidental release behavior of high-pressurized CO2 vessel

2021 ◽  
Vol 145 ◽  
pp. 83-93
Author(s):  
Gengyuan Tian ◽  
Yuan Zhou ◽  
Yanping Huang ◽  
Junfeng Wang ◽  
Yangle Wang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Release Behavior ◽  
Accidental Release

Energy release behavior of Al/PTFE reactive materials powder in a closed chamber

2020 ◽  
Vol 127 (16) ◽  
pp. 165106
Author(s):  
Jianguang Xiao ◽  
Zhengyuan Nie ◽  
Zhao Wang ◽  
Ye Du ◽  
Enling Tang
Keyword(s):  
Energy Release ◽  
Release Behavior ◽  
Closed Chamber ◽  
Reactive Materials

Experimental study of energy release due to cracking of epoxy impregnated conductors

Cryogenics ◽  
1989 ◽  
Vol 29 (7) ◽  
pp. 753-757 ◽  
Author(s):  
H Yanagi ◽  
M Sugimoto ◽  
K Someya ◽  
K Miya ◽  
J Tani
Keyword(s):  
Experimental Study ◽  
Energy Release

Experimental study on mercury release behavior and speciation during pyrolysis of two different coals

2010 ◽  
Vol 38 (2) ◽  
pp. 134-139 ◽  
Author(s):  
Ling LIU ◽  
Yu-feng DUAN ◽  
Yun-jun WANG ◽  
Hui WANG ◽  
Jian-jun YIN
Keyword(s):  
Experimental Study ◽  
Release Behavior ◽  
Mercury Release

Fracture Behavior of Cracked Ring Specimen at Different Crack Positions

2020 ◽  
Vol 142 (5) ◽  
Author(s):  
Abdulmohsen M. Alqahtani ◽  
Thamer K. Albulayhid ◽  
Mutlaq N. Alotaibi ◽  
Ibrahim M. Alarifi ◽  
Tarek M. A. A. EL-Bagory
Keyword(s):  
Experimental Study ◽  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Fracture Behavior ◽  
Radial Crack ◽  
Tensile Load ◽  
Plastic Pipe ◽  
Piping Systems ◽  
Crack Position

Abstract The previous research review of piping systems revealed that the plastic pipe companies suffered from many problems in natural gas pipeline systems. One of the most significant problems that appeared in the piping systems are external cracks due to manufacturing processes, welding technique, and installation processes. The principal goal of the present experimental study is to predict the crack growth behavior and energy release rate of cracked ring specimens made from high-density polyethylene (HDPE) under different crack position angles and various crosshead speeds. The effect of loading rate on the external radial crack at different crack position angles plays an important role in the prediction of fracture behavior of plastic pipe materials. For this reason, it is necessary to conduct a study for the fracture analysis of pipe ring specimens under tension loading with double external cracks at constant radial crack length to width ratio equal a/W = 0.5. A precracking machine is designed especially in the present experimental study to simulate the actual radial cracks at outer surface of pipe ring specimens. The effects of crosshead speed and crack position angle revealed a significant effect on the energy release rate and maximum applied load under tensile load.

Fracture Behavior of Cracked Ring Specimen at Different Crack Positions

2019 ◽  
Author(s):  
Abdulmohsen M. Alqahtani ◽  
Thamer K. Albulayhid ◽  
Mutlaq N. Alotaibi ◽  
Ibrahim M. Alarifi ◽  
Tarek M. A. A. El-Bagory
Keyword(s):  
Experimental Study ◽  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Fracture Behavior ◽  
Radial Crack ◽  
Tensile Load ◽  
Ring Specimen ◽  
Piping Systems ◽  
Crack Position

Abstract The previous research review of piping systems revealed that the plastic pipes companies suffered from many problems in natural gas pipeline systems. One of the most significant problems appeared in the piping systems are external cracks due to manufacturing processes, welding technique and installation processes. The principal goal of the present experimental study is to predict the crack growth behavior and energy release rate of cracked ring specimen made from high-density polyethylene (HDPE) under different crack position angles and various crosshead speeds. The effect of loading rate on the external radial crack at different crack position angles plays an important role in the prediction of fracture behavior of plastic pipe materials. For this reasons, it is necessary to conduct a study for the fracture analysis of pipe ring specimen under tension loading with double external cracks at constant radial crack length to width ratio equal a/W = 0.5. Pre-cracking machine is designed especially in the present experimental study to simulate the actual radial cracks at outer surface of pipe ring specimens. The effects of crosshead speed and crack position angle are revealed a significant effect on the energy release rate and maximum applied load under tensile load.

scholarly journals Probing the Impact Energy Release Behavior of Al/Ni-Based Reactive Metals with Experimental and Numerical Methods

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 499 ◽  
Author(s):  
Kerong Ren ◽  
Rong Chen ◽  
Yuliang Lin ◽  
Shun Li ◽  
Xianfeng Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Constitutive Model ◽  
Energy Release ◽  
Chemical Reaction ◽  
Impact Energy ◽  
Testing Machine ◽  
Strong Impact ◽  
Release Behavior ◽  
The Impact ◽  
Reactive Metals

Reactive metals (RMs) are a new class of material that can withstand mechanical loads and chemically react to release large amounts of heat under strong impact loading. They are gradually becoming widely used in defense and military fields, including for high-efficiency warheads and reactive armor. For the numerical simulation method considering the combined mechanical-thermo-chemical process for the impact energy release behavior of the RMs, the Al/Ni-based RMs were investigated in this work by combining experiments, theoretical calculations and a numerical simulation. Three kinds of Al/Ni-based RMs (Al-Ni, Al-Ni-CuO and Al-Ni-MoO3), were prepared using the hot-pressing forming process. Firstly, the compressive behavior and the parameters of the Johnson-Cook constitutive model were obtained using a mechanical testing machine and split Hopkinson pressure bars (SHPB). Secondly, the parameters of the equation of state (EOS) under the medium and low pressure conditions of the Al/Ni-based RMs, which were was seen as porous mixtures with high theoretical material density percentages (TMD%), were calculated based on the cold-energy superposition theory and the Wu-Jing method. Third, the impact energy release behaviors of the three RMs were studied with direct ballistic tests. The shock temperatures at different impact velocities were calculated based on the existing shock-induced chemical reaction thermo-chemical model while considering the chemical reaction efficiency, the relationship between the shock temperature and the extent of the chemical reaction was established, and the parameters of the relevant chemical kinetic equations were fitted. Finally, the user’s subroutines defining the material model were implemented to update the stresses in the solids elements in LS-DYNA. The model was based on the Johnson-Cook constitutive model with consideration of the mechanical-thermo-chemical coupling effect, which was verified by the experimental results. The results show that the constitutive model developed in this work can describe the impact energy release behavior of the Al/Ni-based RMs.

Initiation and energy release characteristics studies on polymer bonded explosive materials under high speed impact

2015 ◽  
Vol 68 ◽  
pp. 18-23 ◽  
Author(s):  
Xuanming Cai ◽  
Wei Zhang ◽  
Wenbo Xie ◽  
Yugang Ni ◽  
Dacheng Li ◽  
...  
Keyword(s):  
Energy Release ◽  
High Speed ◽  
High Speed Impact ◽  
Explosive Materials
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