• Title/Summary/Keyword: Single Base Propellant

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Research on the Storage Life of Single Base Propellant by Adding Inorganic Stabilizer $CaCO_3$ (무기 안정제 $CaCO_3$ 첨가에 따른 단기 추진제의 저장 수명에 관한 연구)

  • Chang, Il-Ho;Cho, Ki-Hong
    • Journal of the Korea Institute of Military Science and Technology
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    • v.10 no.3
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    • pp.200-207
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    • 2007
  • Single base propellant using a nitrate ester compound NC decomposes naturally during storage time. Therefore, the research for storage life extension is necessary to single base propellant. In this research, $CaCO_3$ inorganic stabilizer had been added into single base propellants up to 0.3%, and the accelerated aging test of the propellant was started. And then, with applying the Arrhenius equation, the storage life of the test of the propellant was contrasted with that of reference propellant. As a result, the storage life of the propellant containing $CaCO_3$ inorganic stabilizer was about twice longer than the reference propellant.

The Study for the Single-based Propellant Shelf Life extension (단기추진제 저장수명 연장을 위한 방안 연구)

  • Bong, Ha-Gyu;Yoon, Keun-Sig
    • Journal of Applied Reliability
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    • v.5 no.3
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    • pp.357-371
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    • 2005
  • Nitrogen oxide gases which were produced by spontaneous reaction of nitrocellulose (NC) in the single base propellant accelerate the decomposition of propellant, and result in the reduction of shelf life, The amount of nitrogen oxide was reduced by the addition of $0.3wt\%$ CaCO3 to conventional stabilizer(DPA) which extended the shelf life of the single base propellant as much as twice compared with commercial propellant.

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The Effect of Stabilizer(DPA, $CaCO_3$) Addition on the Shelf Life of the Single Base Propellant (단기추진제 저장수명에 미치는 안정제(DPA, $CaCO_3$) 첨가의 효과)

  • 윤근식;고석일;유승곤
    • Journal of the Korea Institute of Military Science and Technology
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    • v.6 no.2
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    • pp.9-19
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    • 2003
  • Nitrogen oxide gases which were produced by spontaneous reaction of nitrocellulose(NC) in the single base propellant accelerate the decomposition of propellant, and result in the reduction of shelf life. The amount of nitrogen oxide was reduced by the addition of 0.3wt% $CaCO_3$ to conventional stabilizer(DPA) and down of the solvent leaching temperature from $64^{\circ}C$ to $56^{\circ}C$, which extended the shelf life of the single base propellant as much as twice compare with commercial propellant. The perforation diameter increase of propellant from 0.64mm to 0.77mm could compensate for the drop of burning rate which was caused the addition of $CaCO_3$.

A Study on the Shelf-Life Prediction of the Domestic Single Base Propellants Ammunition : Based on 105mm High Explosive Propellants (국내 단기추진제 탄약의 저장수명 예측에 관한 연구 : 105미리 고폭탄 추진체를 중심으로)

  • Choi, Myoungjin;Park, Hyungju;Yang, Jaekyung;Baek, Janghyun
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.37 no.3
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    • pp.36-42
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    • 2014
  • Domestic 105mm HE (High Explosive) shell is composed of three parts that are Fuze, Projectile and Propellants. Among three parts, propelling charge of propellants part consists of single base propellants. It has been known that the lifespan of single base propellants is affected by a storage period. These are because Nitrocellulose (NC) which is the main component of propelling gunpowder can be naturally decomposed to unstable substances similar with other nitric acid ester. Even though it cannot be prevented fundamentally from being disassembled, a decomposition product ($NO_2$, $NO_3$, and $HNO_3$) and tranquillizer DPA (Diphenylamine) having high reactivity are added into a propellant to restrain induction of automatic catalysis by a decomposition product. The decay rate of the tranquillizer is also affected by a production rate of the decomposition product of NC. Therefore, an accurate prediction of the Self-Life is required to ensure against risks such as explosion. Hereupon, this paper presents a new methodology to estimate the shelf-life of single base propellants using data of ASRP (Ammunition Stockpile Reliability Program) to domestic 105mm HE (propelling charge of propellants part). We selected four attributes that are inferred to have influence on distribution of the DPA amount in a propellant from the ASRP dataset through data mining processes. Then the selected attributes were used as independent variables in a regression analysis in order to estimate the shelf-life of single base propellants.

A Study on Characteristics of Single Base Propellants by the Content Variation of NGD (II) (NGD 함량에 따른 단기 추진제 특성 연구 II)

  • Oh, Minseok;Jang, Jungeun;Joo, Hyeong-uk;Kwon, Tae soo
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2017.05a
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    • pp.968-971
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    • 2017
  • In this study, manufacturing the Single Base propellant using a Nitroguanidine(NGD A%, NGD-B%, 2A=B). The Factors affecting the combustion rate are Moisture and Volatiles, Residual Solvents, Dimension. These Factors were analyzed and compared. Also, NGD-A% propellants and NGD-B% propellants were compared with firing test Test. As a result, NGD-A% was confirmed to have a higher speed at a similar pressure than NGD-B% propellants.

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The Shelf-life Prediction of Single-Base Propellants by applying the Kinetic Model of n-th Order (n차 반응속도 모델을 적용한 단기추진제의 저장수명 예측)

  • Lee, Sang-Bong;Seo, Jung-Wha;Choi, Kyeong-Su;Kim, Sung-Bok
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.5
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    • pp.3633-3642
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    • 2015
  • Single-base propellants contain a single energetic component: nitrocellulose. Accurate predictions of propellant shelf-life should result in cost savings in terms of human and material resources. This study derived an optimized kinetic model reaction order that described stabilizer consumption and estimated propellant shelf-life. High temperature accelerated aging tests gave an optimum reaction order value of 1.15481, from which the minimum standard error of a linear regression estimate of 16.284 was obtained. At normal storage temperature of $21-30^{\circ}C$, propellants should have a safe shelf-life of 140 years, and a minimum of 35 years. It is necessary to consider the temperature range in ammunition storage areas to predict propellant shelf-life more accurately.

A Study on the Shelf-life Prediction of the Single Base Propellants Using Accelerated Aging Test (가속노화시험을 이용한 단기추진제의 저장수명예측에 관한 연구)

  • Lee, Jong-Chan;Yoon, Keun-Sig;Kim, Yong-Hwa;Cho, Ki-Hong
    • Journal of Korean Society for Quality Management
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    • v.35 no.2
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    • pp.45-52
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    • 2007
  • The danger of self-ignition of single base propellants will increase with time. Therefore, a good prediction of the safe storage time is very important. In order to determine the remaining shelf-life of the propellants, the content of stabilizer is determined. The propellants stored under normal storage conditions about 10 to 18 years were investigated and accelerated aging test was carried out by storing propellant sample at higher temperature. Finally, we analyzed the results by various methods in order to show the best way to predict the realistic shelf-life. The safe storage life of the propellants will be 24 years, at least 15 years. In case of applying Arrhenius's law, using the reaction rate constant at 28$^{\circ}C$ to 30$^{\circ}C$ to predict the shelf-life by accelerated aging test is reasonable for a good prediction.

A study on the shelflife prediction of single base propellants (단가추진제의 저장수명 예측에 관한 연구)

  • Lee, Jong-Chan;Yoon, Keun-Sig;Kim, Yong-Hwa;Cho, Ki-Hong
    • Proceedings of the Korean Society for Quality Management Conference
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    • 2006.11a
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    • pp.321-326
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    • 2006
  • The danger of self-ignition of single base propellants will increase with time. Therefore, a good prediction of the safe storage time is very important In order to determine the remaining shelf1ife of the propellants, the content of stabilizer is determined. The propellants stored under normal storage conditions about 10 to 18 years were investigated and accelerated aging test was carried out by storing propellant sample at higher temperature. Finally, we analyzed the results by various methods in order to show the best way to predict the realistic shelflife. The safe storage life of the propellants will be 24 years, at least 15 years. In case of applying Arrhenius's law, using the reaction rate constant at $28^{\circ}C$ to $30^{\circ}C$ to predict the shelflife by accelerated aging test is reasonable for a good prediction.

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Incineration Process of Double Base Propellant for Demilitarization (더블 베이스 추진제의 비군사화 소각공정)

  • Lee, Si-Hwang;Baek, Seung-Won;Moon, Il;Park, Jung-Su;Oh, Min
    • Clean Technology
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    • v.22 no.3
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    • pp.190-195
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    • 2016
  • The thermal decomposition of waste energetic materials such as TNT, RDX and composition B in a commercial rotary kiln has previously been carried out. As part of the demilitarization process, the thermal decomposition of homogeneous double base propellant (DB) used in M8 and consisting predominantly of nitrocellulose and nitroglycerine is examined with respect to a number of operating conditions. A single condensed phase reaction with 4 species and 365 gas phase reactions and 59 species are considered. Simulation results show the sensitivity of the thermal decomposition of DB with temperature and velocity. At relatively low velocity with constant inlet hot air temperature, temperature in the rotary kiln was found to be highest, 953 K and 1300 K for cases 3 and 6 respectively. Illustrating that optimum operating temperature can be achieved by controlling the inlet velocity without additional cooling systems.

Estimation of Shelf Life for Propellant KM6 by Using Gamma Process Model (감마과정 모델을 이용한 KM6 추진제의 저장수명 예측)

  • Park, Sung-Ho;Kim, Jae-Hoon
    • Journal of the Korean Society of Propulsion Engineers
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    • v.16 no.4
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    • pp.33-41
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    • 2012
  • The aim of the study is to investigate the method to estimate a shelf life of KM6 single base propellant by stochastic gamma process model. The state failure level is assumed that the degradation content of stabilizer is below 0.8%. The constant of time dependent shape function and the scale parameter of stationary gamma process are estimated by moment method. The state distribution at each storage time can be shown from probability density function of deterioration. It is estimated that the $B_{10}$ life, a time at which the cumulative failure probability is 10%, is 25 years and the $B_{50}$ life is 36 years from cumulative failure distribution function curve. The $B_{50}$ life can be treated as the average shelf life from the practical viewpoint and the lifetime can be expressed as distribution curve by using stochastic process theory.