Aging studies on carboxy terminated polybutadiene (CTPB) binder and propellant

Kishore, K.; Verneker, V. R. Pai; Gayathri, V.; Shubha, K.R.; Sridhara, K.

doi:10.2514/3.25609

Cited by 9 publications

(3 citation statements)

References 4 publications

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“…This allows one to attain engine failure in admissible and predictable time. 230,231 Direct comparison of the results of calculations with the behaviour of the item under operating conditions requires too long time. However, differences between the test results and the life expectancy can be due to not only ignoration of some operation factors but also to a change in the mechanism of the process under operating conditions.…”

Section: Stability Prediction Of Energetic Materialsmentioning

confidence: 99%

Chemical physics of decomposition of energetic materials. Problems and prospects

Смирнов¹

2004

Russ. Chem. Rev.

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Section: Stability Prediction Of Energetic Materialsmentioning

confidence: 99%

Chemical physics of decomposition of energetic materials. Problems and prospects

Смирнов¹

2004

Russ. Chem. Rev.

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“…The actual aging behavior during in-service use is known and therefore its effects on the critical strain and stress components should be periodically evaluated during the motor lifetime, so the consideration of the aging effect in constitutive equations is therefore necessary. Kishore et al [11] performed a thermomechanical analysis of CTPB-based propellants by measuring an increase in crosslinking degree considering the aging effects. By taking chemical aging kinetics into account, Zhou [12] developed a nonlinear viscoelastic constitutive equation of composite propellants incorporating with chemical aging effect of plyometric binder.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional Structural Analysis Approach for Aging Composite Solid Propellant Grains

Deng

Xie

Tang

2013

Propellants Explo Pyrotec

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The viscoelastic aging behavior of composite solid propellant grains is studied by a three-dimensional thermoviscoelastic constitutive model with aging evolution, in which the crosslinking degree is taken as an aging variable. The resulting viscoelastic constitutive equations are numerically discretized into incremental form by integration algorithms, and the stress-updating method is presented according to incremental law. Subsequently, the Abaqus-based user material subroutine and its structural analysis module are constructed and validated through typical examples. Studies show that the results of structural analysis have high accuracy and are in well agreement with each other. The designed analysis module presents an effective aging-mechanical analysis platform for further lifespan estimation of solid rocket motors.

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“…The method of obtaining crosslink density and penetration temperature from TMA is described elsewhere. 6 For crosslink density measurements samples cured at 75°C to the maximum gel content were employed. A decrease in thickness of the sample by applying force (5 g) on the probe was recorded at room temperature from which crosslink density can be calculated.…”

Section: Measurement Of Penetration Temperature and Crosslink Densitymentioning

confidence: 99%

Curing reactions in elastomers. II. Carboxy‐terminated polybutadiene

Kishore

Verneker

Vasanthakumari

1983

J of Applied Polymer Sci

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SynopsisAttempts have been made to understand the curing reactions in carboxy-terminated polybutadiene (CTPB), which happens to be the most practical binder in advanced solid composite propellants. The curing of CTPB has been studied for different ratios of curing agents (MAPO and Epoxide) by gel content, molecular weight, crosslink density, and penetration temperature measurements, and the optimum composition of curators for effective curing of CTPB has been determined. Activation energy calculations on the curing of CTPB with 9.5% epoxide and 0.5% MAPO in the temperature range 75100°C gave 14.1 kcal/mol for which a diffusion-controlled or acid-catalyzed epoxide ring opening mechanism has been suggested for the curing process in CTPB.

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Aging studies on carboxy terminated polybutadiene (CTPB) binder and propellant

Cited by 9 publications

References 4 publications

Chemical physics of decomposition of energetic materials. Problems and prospects

Chemical physics of decomposition of energetic materials. Problems and prospects

Three‐dimensional Structural Analysis Approach for Aging Composite Solid Propellant Grains

Curing reactions in elastomers. II. Carboxy‐terminated polybutadiene

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