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مرکز اطلاعات علمی SID1
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Author(s): 

ZOHARI N. | Marashi Manesh S.

Issue Info: 
  • Year: 

    2019
  • Volume: 

    13
  • Issue: 

    4 (40)
  • Pages: 

    209-215
Measures: 
  • Citations: 

    0
  • Views: 

    249
  • Downloads: 

    484
Abstract: 

In this study the relationship between impact sensitivity and electrostatic sensitivity of energetic nitro compounds is investigated. Furthuremore, the most important molecular descriptors which affect this correlation are studied. The results showed that the ratio of number of the oxygen atoms to hydrogen atoms       , and the number of amino groups(NH2) have important roles in the proposed model. The coefficient of the new correlation is determined to be 0. 99. Also, the root mean square deviation (RMSD) and the average absolute deviation (AAD) are 2. 79 and 2. 09 J, respectively. Currently exact mechanism of initiation of energetic materials against external stimuli is not well realized. In this paper, we investigated the relationship between impact sensitivity and electrostatic sensitivity of Nitro Energetic Compounds to recognize the effect of structural factors in the development of this sensitivity using Multiple Linear Regression Method. The proposed model can also be applied for the design of novel energetic nitro compounds.

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Issue Info: 
  • Year: 

    2019
  • Volume: 

    13
  • Issue: 

    4 (40)
  • Pages: 

    217-225
Measures: 
  • Citations: 

    0
  • Views: 

    301
  • Downloads: 

    609
Abstract: 

The effect of temperature and curing agent on rheological behavior of binder system based on Hydroxyl terminated Polybutadiene (HTPB) has an importan rolet in the production of medium and large-size grains. In this research, the effect of casting temperature (40, 50 and 60 º C) and chemical structure of curing agents (TDI, IPDI and HDI) on rheological behavior of a binder system based on HTPB are investigated. Increasing casting temperature due to curing progress, builds up the viscosity. Therefore, decreasing casting temperature by controlling curing process increases the pot life of binder system. Logarithmic variation of viscosity versus time for three binder systems based on TDI, IPDI, and HDI at different temperatures implies that binder system based on HTPB-TDI due to aromatic structure of TDI shows the fastest viscosity increasing rate. Moreover binder system based on HTPB-IPDI shows the lowest viscosity increasing rate due to aliphatic structure of IPDI.

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Author(s): 

CHIZARI M. | BAYAT Y.

Issue Info: 
  • Year: 

    2019
  • Volume: 

    13
  • Issue: 

    4 (40)
  • Pages: 

    227-233
Measures: 
  • Citations: 

    0
  • Views: 

    331
  • Downloads: 

    493
Abstract: 

In the present study, the improvement of the mechanical and thermal properties of GAP by its copolymerization with polytetrahydrofuran is investigated. New energetic triblock copolymer was synthesized using 1, 4-Butanediol as initiator and cation ring polymerization method using epichlorohydrin. Also, tetrahydrofuran monomers is used in the presence of Boron trifluoride as catalyst. The triblock copolymer was characterized by GPC, 13CNMR, ˡ HNMR, IR. The thermal behavior of the synthesized copolymer showed the increase in thermal stability and the reduction in glass transition temperature of the copolymer compared to GAP. Compatibility of energetic plasticizers on copolymer was also studied. In addition, the mechanical properties of elastomers based on the synthesized copolymer were studied.

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Author(s): 

IZADIFARD R.A. | MOTTAGHI L.

Issue Info: 
  • Year: 

    2019
  • Volume: 

    13
  • Issue: 

    4 (40)
  • Pages: 

    235-244
Measures: 
  • Citations: 

    0
  • Views: 

    271
  • Downloads: 

    438
Abstract: 

For the purpose of reducing structural damage against blast loading, fiber reinforced polymers sheet (CFRP, GFRP) can be used to retrofit the RC slabs. In this study, specimen of reinforced concrete slabs with or without retrofitting are modeled numerically. The results show that using high resistant, elastic material such as FRP sheets, are effective in reducing deformation of slabs, but it doesn’ t significantly increase the energy absorption capacity of structure. Using Polyurea (PU) coating with elastoplastic behavior on the FRP sheets, in addition of deformation reducing, will increase the absorption of energy up to 40 percent. In this combination, layer arrangement has an important role, so that if the PU coating is positioned between concrete and hard sheets, its efficiency will be reduced by 30% compared to the previous arrangement. When the reinforcement element is placed in front of the slab, it will increase the energy absorption up to 50 percent compared to the state where it is placed in the back of the slab. It has been also shown that PU alone is not useful and it should be used with stiffeners for better results.

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Issue Info: 
  • Year: 

    2019
  • Volume: 

    13
  • Issue: 

    4 (40)
  • Pages: 

    245-254
Measures: 
  • Citations: 

    0
  • Views: 

    273
  • Downloads: 

    167
Abstract: 

In this study, the rheological parameters such as yield stress, viscosity coefficient, and power law index were obtained for double-base propellants and modified double-base propellants formulations using the Squeeze flow rheometric method. Squeeze flow test was used to investigate the rheological behavior without wall slip condition, and to determine the temperature dependency of fluidity in double-base propellants and modified double-base propellants formulations. The results showed that for double-base propellants and modified double-base propellants formulations, the initial elastic behavior is identical in terms of phenomenology, however, differs in term of the value. There are distinct structural differences and different rheological properties between double-base propellants and modified double-base propellants formulations. By increasing the percentage of energetics nitramines (RDX) in modified double-base, the average squeeze flow force moves to higher values. A similar behavior is observed by decreasing the percentage of nitroglycerin. The results show that the Sherwood’ s model for the flow of double-base propellants is better than the curves of modified double-base propellants, which reflects the deviation of the rheological behavior of modified double-base propellants from Herschel-Bulkley fluids.

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Issue Info: 
  • Year: 

    2019
  • Volume: 

    13
  • Issue: 

    4 (40)
  • Pages: 

    255-261
Measures: 
  • Citations: 

    0
  • Views: 

    401
  • Downloads: 

    461
Abstract: 

Glycidyl azide polymer (GAP) is used as binder in propellants. Energetic ionic liquids are used as plasticizer to improve the properties of polymer. In the present study, firstly, ionic liquid was bonded to the GAP by certain amount and then the energetic anions of nitrate (NO3) and azide (N3) were used to exchange anion. FTIR analyses confirm accurately anions exchange. DSC, viscometer and heat of combustion analyses have been carried out. The glass transition temperature, viscosity, and GAP energy were changed by anion exchange. Glass transition temperatures for ionic liquids with nitrate (NO3) and azide (N3) anions were measured to be-43. 25 ° C and-40. 91 ° C, viscosities 4 Pa. s and 5 Pa. s and heats of combustion were 20. 46 kJ/g and 19. 98 kJ/g, respectively. The results of the analysis indicate that the ionic liquid with nitrate anion gives better results compared to the ionic liquid with azide anion.

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Author(s): 

JAVADI N. | NASSIMI A.

Issue Info: 
  • Year: 

    2019
  • Volume: 

    13
  • Issue: 

    4 (40)
  • Pages: 

    263-268
Measures: 
  • Citations: 

    0
  • Views: 

    213
  • Downloads: 

    158
Abstract: 

In present study, the heat of detonation of high energy compounds with CaHbNcOd formula was obtained based on Kistiakowski-Wilson rules. Comparing the obtained results with that of experimental data, group additivity method and Kamlet method shows that the values of heat of detonation based on the Kistiakowski-Wilson rules are more accurate. The velocity and pressure of detonation for some high energy compound were also obtained by using Kamlet method based on Kistiakowski-Wilson rules. The results show that the mean errors of this method in estimation of detonatin velocity and detonatin pressure are 5. 3% and 10. 7%, respectively. In order to increase the accuracy, the constants of Kamlet equations were modified by regressing the results to experimental values. The mean error of new equations in predicting the velocity and pressure of detonation are 3. 0% and 4. 0%, respectively, which have been significantly enhanced compared to Kamlet equations.

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