The role of adhesion and binder stiffness in the impact sensitivity of cast composite energetic materials

2020 ◽  
Vol 128 (21) ◽  
pp. 214902
Author(s):  
J. A. Wickham ◽  
S. P. Beaudoin ◽  
S. F. Son
Keyword(s):  
Energetic Materials ◽  
Impact Sensitivity ◽  
Cast Composite ◽  
The Impact

scholarly journals Effect of Nano-Sized Energetic Materials (nEMs) on the Performance of Solid Propellants: A Review

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 133
Author(s):  
Weiqiang Pang ◽  
Chongqing Deng ◽  
Huan Li ◽  
Luigi T. DeLuca ◽  
Dihua Ouyang ◽  
...  
Keyword(s):  
Energetic Materials ◽  
Research Topic ◽  
Impact Sensitivity ◽  
Solid Propellants ◽  
Rocket Nozzle ◽  
Nano Scale ◽  
Different Types ◽  
Solid Rocket ◽  
Friction Sensitivity ◽  
The Impact

As a hot research topic, nano-scale energetic materials have recently attracted much attention in the fields of propellants and explosives. The preparation of different types of nano-sized energetic materials were carried out, and the effects of nano-sized energetic materials (nEMs) on the properties of solid propellants and explosives were investigated and compared with those of micro-sized ones, placing emphasis on the investigation of the hazardous properties, which could be useable for solid rocket nozzle motor applications. It was found that the nano-sized energetic materials can decrease the impact sensitivity and friction sensitivity of solid propellants and explosives compared with the corresponding micro-sized ones, and the mechanical sensitivities are lower than that of micro-sized particles formulation. Seventy-nine references were enclosed.

scholarly journals Correlation between the self-sustaining ignition ability and the impact sensitivity of energetic materials

2020 ◽  
Vol 1 (1) ◽  
pp. 40-49 ◽  
Author(s):  
Xiaoxue Xiong ◽  
Xudong He ◽  
Ying Xiong ◽  
Xianggui Xue ◽  
Haijun Yang ◽  
...  
Keyword(s):  
Energetic Materials ◽  
Impact Sensitivity ◽  
The Self ◽  
The Impact

scholarly journals Models for predicting impact sensitivity of energetic materials based on the trigger linkage hypothesis and Arrhenius kinetics

2020 ◽  
Vol 26 (4) ◽  
Author(s):  
Tomas L. Jensen ◽  
John F. Moxnes ◽  
Erik Unneberg ◽  
Dennis Christensen
Keyword(s):  
Bayesian Analysis ◽  
Bond Dissociation Energy ◽  
Dissociation Energy ◽  
Energetic Materials ◽  
Impact Sensitivity ◽  
Model Complexity ◽  
Coefficient Of Determination ◽  
Nitrate Esters ◽  
Bond Dissociation ◽  
The Impact

Abstract In order to predict the impact sensitivity of high explosives, we designed and evaluated several models based on the trigger linkage hypothesis and the Arrhenius equation. To this effect, we calculated the heat of detonation, temperature of detonation, and bond dissociation energy for 70 energetic molecules. The bond dissociation energy divided by the temperature of detonation proved to be a good predictor of the impact sensitivity of nitroaromatics, with a coefficient of determination (R2) of 0.81. A separate Bayesian analysis gave similar results, taking model complexity into account. For nitramines, there was no relationship between the impact sensitivity and the bond dissociation energy. None of the models studied gave good predictions for the impact sensitivity of liquid nitrate esters. For solid nitrate esters, the bond dissociation energy divided by the temperature of detonation showed promising results (R2 = 0.85), but since this regression was based on only a few data points, it was discredited when model complexity was accounted for by our Bayesian analysis. Since the temperature of detonation correlated with the impact sensitivity for nitroaromatics, nitramines, and nitrate esters, we consider it to be one of the leading predictive factors of impact sensitivity for energetic materials.

scholarly journals Surface Coating of Cyclotetramethylenetetranitramine (HMX) Particles and Its Property Investigation

2021 ◽  
Vol 8 ◽  
pp. 77-81
Author(s):  
Guo Yan ◽  
Shi Xiaobing ◽  
Pang Weiqiang ◽  
Qin Zhao ◽  
Xu Huixiang ◽  
...  
Keyword(s):  
Water Solution ◽  
Thermoplastic Polyurethane ◽  
Impact Sensitivity ◽  
Coating Materials ◽  
Internal Solution ◽  
Wetting Ability ◽  
Electron Spectrometry ◽  
Friction Sensitivity ◽  
The Impact

To improve the safety of cyclotetramethylenetetranitramine (HMX) particles, the polymer thermoplastic polyurethane elastomer (TPU) and nitrocellulose (NC) were introduced to coat HMX powder by water-solution suspension method and internal solution method, respectively. Scanning electron microscope (SEM) and X-ray photo-electron spectrometry (XPS) were employed to characterize the HMX samples and the role of NC and TPU in the coating processes were discussed. The impact sensitivity, friction sensitivity, and the thermal decomposition of coated HMX particles were investigated, and compared to the unprocessed ones. The results indicate that both TPU and NC can improve the wetting ability of the coating materials on HMX surface and reinforce the connection between HMX and the coating materials. The impact sensitivity and friction sensitivity of HMX samples decrease obviously after they have been surface coated; the drop height (H50) is increased from 35.24 cm to 50.08 cm, and the friction probability is reduced from 93.2 % to 58.3%. The activation energy (Ea) and the self-ignition temperature increase by 10.46 KJ·mol-1 and 1.8, respectively.

scholarly journals Predicting the reactivity of energetic materials: an ab initio multi-phonon approach

2019 ◽  
Vol 7 (33) ◽  
pp. 19539-19553 ◽  
Author(s):  
Adam A. L. Michalchuk ◽  
Morris Trestman ◽  
Svemir Rudić ◽  
Peter Portius ◽  
Peter T. Fincham ◽  
...  
Keyword(s):  
Ab Initio ◽  
Energetic Materials ◽  
Impact Sensitivity ◽  
Model Based ◽  
The Impact

The impact sensitivity of energetic materials is successfully predicted using an ab initio model based on the concepts of phonon up-pumping.

Intergroup Threat and Outgroup Attitudes

2013 ◽  
Vol 44 (5) ◽  
pp. 311-319 ◽  
Author(s):  
Marco Brambilla ◽  
David A. Butz
Keyword(s):  
Gay Men ◽  
Social Group ◽  
Welfare Recipients ◽  
Intergroup Attitudes ◽  
Social Policies ◽  
Intergroup Threat ◽  
Economic Threat ◽  
The Impact ◽  
General Climate

Two studies examined the impact of macrolevel symbolic threat on intergroup attitudes. In Study 1 (N = 71), participants exposed to a macrosymbolic threat (vs. nonsymbolic threat and neutral topic) reported less support toward social policies concerning gay men, an outgroup whose stereotypes implies a threat to values, but not toward welfare recipients, a social group whose stereotypes do not imply a threat to values. Study 2 (N = 78) showed that, whereas macrolevel symbolic threat led to less favorable attitudes toward gay men, macroeconomic threat led to less favorable attitudes toward Asians, an outgroup whose stereotypes imply an economic threat. These findings are discussed in terms of their implications for understanding the role of a general climate of threat in shaping intergroup attitudes.

Sign in / Sign up

Export Citation Format

Share Document