CN104914123A - Method for evaluating storage life of NEPE propellant - Google Patents
Method for evaluating storage life of NEPE propellant Download PDFInfo
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- CN104914123A CN104914123A CN201510220954.8A CN201510220954A CN104914123A CN 104914123 A CN104914123 A CN 104914123A CN 201510220954 A CN201510220954 A CN 201510220954A CN 104914123 A CN104914123 A CN 104914123A
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- nepe propellant
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Abstract
The invention discloses a method for evaluating storage life of an NEPE propellant. The method for evaluating the storage life of the NEPE propellant comprises the following steps: step 1, designing acceleration tests at different temperatures; step 2, choosing a life pre-estimating model; and step 3, pre-estimating the loading storage life of the NEPE propellant. The method takes the cross-linking density as a characteristic parameter, evaluates the storage life of the NEPE propellant, has less sample amount required in the test process, reduces the test risk, saves the drug manufacturing cost, and besides, greatly shortens the test time.
Description
Technical field
The invention belongs to explosive wastewater technical field, relate generally to the predictor method of NEPE propellant loading storage life, particularly relating to cross-linking density is characteristic parameter, adopts different temperatures acceleration service life test method to assess the storage life of NEPE propellant.
Background technology
The Polyether propellants (NEPE propellant) of nitrate plasticising is the solid propellant of new generation that the U.S. grew up the end of the seventies in last century, the beginning of the eighties, this propellant combines the advantage of double base propellant and composite propellant, be the novel propellant of current energy characteristics and excellent in mechanical performance, represent the developing direction of high-energy solid propellant.
As compound substance, can there is physics, chemical change slowly in NEPE propellant, cause the performance such as energy, mechanics, burning to change, affect the security of solid propellant rocket, reliability and storage life in long storage process.At present, the storage life of NEPE propellant estimates the accelerated test generally adopting different temperatures, chooses pulling strengrth or gel fraction as characteristic parameter, by the change of tracking characteristics parameter, set up the equivalent relation of temperature and period of storage, thus the storage life of assessment NEPE propellant.Wherein, pulling strengrth test is the I shape sample (as shown in Figure 1) sample preparation being become 120mm × 25mm × 10mm, put into drawing machine to test, but required sample size too large (being greater than 35g) and test have a big risk, pharmacy cost is higher; Gel fraction test is cut into pieces a small amount of propellant sample (about 2g), joining after taking sample fills in the apparatus,Soxhlet's of solvent, fully swelling, then under suitable bath temperature, solvent extraction solvend is used, finally take out insolubles, solvent is removed, the mass ratio determination gel fraction before and after extracting per sample in vacuum drying oven.But this process is more more than tension test step, complicated operation, and wherein swelling extraction unit operation just needs to reach 24h, seriously reduces testing efficiency.
In a word, at present about the test of two characteristic parameters in NEPE propellant storage process, test sample size is large on the one hand, causes the huge waste of sample; Test process is complicated on the other hand, and the cycle is oversize, for the work of NEPE propellant storage life prediction causes very large inconvenience.
Summary of the invention
The present invention is directed to the weak point that prior art exists, providing a kind of take cross-linking density as the characteristic parameter of ageing process, the method for the storage life of assessment NEPE propellant loading.
Under long storage environment temperature and under high temperature accelerated test condition, there is degraded chain rupture in the bonding agent network of NEPE propellant loading, reduces the plasticity of powder charge, and Microscopic is that cross-linking density reduces.Based on this research, the invention provides a kind of take cross-linking density as the characteristic parameter of ageing process, the method for the shelf life of assessment NEPE propellant loading.The method, by the accelerated test under different temperatures, take cross-linking density as characteristic parameter, and obtains the Changing Pattern of characteristic parameter by accelerated life test under different temperatures, assessment NEPE propellant storage life.
In order to realize above-mentioned task, the present invention takes following technical solution:
Assess a method for NEPE propellant storage life, it is characterized in that, follow these steps to carry out: step one: design experiment method
By the accelerated test of different temperatures, and sample respectively within the corresponding time interval, make 10mm × 10mm × 20mm rectangular parallelepiped, the cross-linking density numerical value of test sample, obtains the Changing Pattern of cross-linking density with digestion time.
Step 2: choose prediction model
In accelerated test, select the storage life of Bei Seluo special formula way predictor NEPE propellant, Bei Seluo special formula journey is as follows:
T＝A+B logτ (1)
In formula: T---heating-up temperature, DEG C;
τ---period of storage, sky;
A, B---coefficient.
Step 3: estimate NEPE propellant loading storage life
Adopt the technical indicator of given NEPE propellant cross-linking density as inefficacy terminal, test number of days corresponding under obtaining each aging temperature respectively, one-variable linear regression is carried out through (1) formula, obtain A and B two coefficients respectively, again the normal shelf temperature of NEPE propellant is substituted into (1) formula, under calculating normal shelf conditions in advance, the storage life of NEPE propellant when cross-linking density drops to the technical indicator of specifying.
The predictor method of NEPE propellant loading storage life of the present invention, beneficial effect is embodied in following several respects:
(1) proposing a kind of is characteristic parameter with cross-linking density, the method for assessment NEPE propellant loading storage life.
(2) cross-linking density test process convenient and time-saving (whole test process is about 40min), sample size few (10mm × 10mm × 20mm rectangular parallelepiped), has not only saved cost, and has substantially increased testing efficiency.
(3) the present invention can extend to the assessment of other high polymer binder propellant storage lives.
Accompanying drawing explanation
Fig. 1 pulling strengrth tests sample used.
The relation curve of Fig. 2 cross-linking density rate of change and time.
The process of Fig. 3 data regression.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
1. contrived experiment method
65 DEG C, 75 DEG C, 85 DEG C Temperature-Accelerated Life Tests are carried out respectively to NEPE propellant, and sample within the corresponding time interval, and make 10mm × 10mm × 20mm rectangular parallelepiped, adopt the alternating temperature low frequency nuclear magnetic resonance cross-linking density instrument of Shanghai Niumai Electronic Technology Co., Ltd., the cross-linking density of test sample.
2. choose prediction model
In accelerated test, select the storage life of Bei Seluo special formula way predictor NEPE propellant, Bei Seluo special formula journey is as follows:
T＝A+B logτ (1)
In formula: T---heating-up temperature, DEG C;
τ---period of storage, sky;
A, B---coefficient.
3. estimate NEPE propellant loading storage life
Table 1 is under different temperatures acceleration environment, and cross-linking density is with the situation of change of test period.
Cross-linking density result under table 1 different temperatures
According to cross-linking density rate of change and the relation curve of time (as Fig. 2) under 65 DEG C, 75 DEG C, 85 DEG C conditions of matching, cross-linking density is down to original 85% as inefficacy terminal, the marginal time that cross-linking density drops to 85% original correspondence can be obtained, in table 2.
Table 2 aging temperature and marginal time tables of data
By table 2 data, carry out data regression process (as Fig. 3) according to Bei Seluo special formula journey T=A+B log τ, return and obtain equation: T=89.12255-15.46499log τ.
By at Bei Seluo special formula way predictor 25 DEG C, the storage life estimating NEPE propellant based on cross-linking density is:
τ=38.37 year.
Claims (1)
1. assess a method for NEPE propellant storage life, it is characterized in that, follow these steps to carry out:
Step one: design experiment method
By the accelerated test of different temperatures, and sample respectively within the identical time interval, test cross-linking density numerical value, obtains the Changing Pattern of cross-linking density with digestion time;
Step 2: choose prediction model
In accelerated test, select the storage life of Bei Seluo special formula way predictor NEPE propellant, Bei Seluo special formula journey is as follows:
T＝A+B log τ (1)
In formula: T---heating-up temperature, DEG C;
τ---period of storage, sky;
A, B---coefficient;
Step 3: estimate NEPE propellant loading storage life
Cross-linking density is dropped to the technical indicator of specifying as inefficacy terminal, marginal test number of days corresponding under obtaining each aging temperature respectively, one-variable linear regression is carried out through (1) formula, obtain A and B two coefficients respectively, again by normal shelf temperature 25 DEG C substitution (1) formula of NEPE propellant, under calculating normal shelf conditions in advance, the storage life of NEPE propellant when cross-linking density drops to the technical indicator of specifying.
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Cited By (8)
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| CN106370689A (en) * | 2016-08-23 | 2017-02-01 | 西安近代化学研究所 | Detection method of change rule of plastisol moulding degree of nitro-cotton in high-solid-content propellant |
| CN106814096A (en) * | 2017-03-13 | 2017-06-09 | 上海纽迈电子科技有限公司 | A kind of method for measuring elastomer crosslinked density |
| CN106908468A (en) * | 2017-03-03 | 2017-06-30 | 西安近代化学研究所 | Gel state cloud detonator cross-linked state Changing Pattern detecting system under high temperature |
| CN109297896A (en) * | 2018-10-31 | 2019-02-01 | 中国兵器工业第五九研究所 | A kind of composite solidpropellant agine mechaism method for evaluating consistency |
| CN109324077A (en) * | 2018-08-14 | 2019-02-12 | 中国石油天然气股份有限公司 | A kind of determination method and device of crosslinked polymer gel thermal stability |
| CN109632613A (en) * | 2018-11-27 | 2019-04-16 | 西安近代化学研究所 | A kind of predictor method being pressed penetration explosive JHLDu-1 powder charge safe operating life |
| CN110082384A (en) * | 2019-05-15 | 2019-08-02 | 湖北航天化学技术研究所 | Flow Behavior of Solid High Energy Propellant column produces gas and generates hole or cracking time prediction technique |
| CN112504029A (en) * | 2020-11-30 | 2021-03-16 | 西安航天动力研究所 | Accelerated storage life evaluation method for solid double-base propellant small rocket |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106370689A (en) * | 2016-08-23 | 2017-02-01 | 西安近代化学研究所 | Detection method of change rule of plastisol moulding degree of nitro-cotton in high-solid-content propellant |
| CN106370689B (en) * | 2016-08-23 | 2017-11-24 | 西安近代化学研究所 | The detection method of the molten modeling degree changing rule of nitrocotton in high solids content propellant powder |
| CN106908468A (en) * | 2017-03-03 | 2017-06-30 | 西安近代化学研究所 | Gel state cloud detonator cross-linked state Changing Pattern detecting system under high temperature |
| CN106908468B (en) * | 2017-03-03 | 2018-06-12 | 西安近代化学研究所 | Gel state cloud detonator cross-linked state changing rule detecting system under high temperature |
| CN106814096A (en) * | 2017-03-13 | 2017-06-09 | 上海纽迈电子科技有限公司 | A kind of method for measuring elastomer crosslinked density |
| CN106814096B (en) * | 2017-03-13 | 2019-03-01 | 上海纽迈电子科技有限公司 | A method of measuring elastomer crosslinked density |
| CN109324077A (en) * | 2018-08-14 | 2019-02-12 | 中国石油天然气股份有限公司 | A kind of determination method and device of crosslinked polymer gel thermal stability |
| CN109324077B (en) * | 2018-08-14 | 2022-03-29 | 中国石油天然气股份有限公司 | Method and device for determining thermal stability of polymer crosslinked gel |
| CN109297896A (en) * | 2018-10-31 | 2019-02-01 | 中国兵器工业第五九研究所 | A kind of composite solidpropellant agine mechaism method for evaluating consistency |
| CN109632613A (en) * | 2018-11-27 | 2019-04-16 | 西安近代化学研究所 | A kind of predictor method being pressed penetration explosive JHLDu-1 powder charge safe operating life |
| CN109632613B (en) * | 2018-11-27 | 2021-04-13 | 西安近代化学研究所 | Estimation method for safe service life of JHLDU-1 explosive charge of press-loaded penetration explosive |
| CN110082384A (en) * | 2019-05-15 | 2019-08-02 | 湖北航天化学技术研究所 | Flow Behavior of Solid High Energy Propellant column produces gas and generates hole or cracking time prediction technique |
| CN110082384B (en) * | 2019-05-15 | 2021-07-23 | 湖北航天化学技术研究所 | Method for predicting time for generating holes or cracks by high-energy solid propellant grains through gas generation |
| CN112504029A (en) * | 2020-11-30 | 2021-03-16 | 西安航天动力研究所 | Accelerated storage life evaluation method for solid double-base propellant small rocket |
| CN112504029B (en) * | 2020-11-30 | 2022-11-18 | 西安航天动力研究所 | Accelerated storage life evaluation method for solid double-base propellant small rocket |
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