Studies on Stress-Strain Curves of Aged Composite Solid Rocket Propellants

Shekhar, Himanshu

doi:10.14429/dsj.62.773

Cited by 21 publications

(9 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A propellant grain must have sufficient structural capability to withstand various loading conditions during extreme range of temperature operation, handling, ignition, and firing [1,2]. Several attempts were made to evaluate mechanical properties of composite propellant to simulate various loading conditions [3][4][5][6][7][8]. The effect of temperature and strain rate on mechanical properties of solid propellant are generally studied using Universal Tensile Machine (UTM) and are well reported in the literatures [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Pressure on Mechanical Properties of Composite Propellant

Bihari

Kumaraswamy

Jain

et al. 2021

Propellants Explo Pyrotec

View full text Add to dashboard Cite

Composite propellant must possess sufficient structural capability to withstand the various loading conditions. Several attempts are made worldwide to evaluate mechanical properties of composite propellant at different temperatures and strain rates but effect of pressure has not been yet fully elaborated. In the present study, effect of pressure on mechanical properties of composite propellant was evaluated and discussed to obtain the best possible simulation of firing phenomena. The Universal Testing Machine (UTM) was used to characterize the mechanical behavior of AP/ Al/ HTPB based composite propellant at different strain rates of 0.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Pressure on Mechanical Properties of Composite Propellant

Bihari

Kumaraswamy

Jain

et al. 2021

Propellants Explo Pyrotec

View full text Add to dashboard Cite

show abstract

“…The safe-life at 300 K in air has been calculated in the study as a function of the rate of change. Shekhar H [72] reported variation in various mechanical properties with time. For composite propellant, tensile strength increases where as percentage elongation reduces.…”

Section: Recent Advancesmentioning

confidence: 99%

Desirability and Assessment of Mechanical Strength Characteristics of Solid Propellant for Use in Multi Barrel Rocket Launcher

Bose¹,

Pandey²

2012

IJCEA

View full text Add to dashboard Cite

Solid fuel is the first choice to propel the rockets for the area weapon Multi Barrel Rocket Launcher (MBRL) due to ease of design, manufacturing, handling, packaging, transportability and deployability. It also has the capability of prolonged storage without noticeable degradation of its quality. It is also quite safe and does not pose safety hazards. Tactically it suits the requirement of very fast response time and generates high thrust for small duration. Composite modified double base propellant (CMDB) is preferred in MBRL due to wide range of favorable mechanical properties including superior strain capability. Properties of composite propellant may be tailor made by changing the compositions and compound rate. Various failure modes of this propellant are found to be thermal cycling, handling and transport vibrations, ignition shock and pressure loading, launch and flight acceleration, flight maneuver, high speed maneuver, environmental condition etc. All these causes unsymmetrical stress distribution and may lead to failure. Bond strength within the propellant and between the propellant and inhibitor material is very important parameter to control mechanical failure. For safe design the bond strength should be more than the ultimate tensile strength of the propellant. This criterion is satisfied in the present case for the CMDB propellant of MBRL. Index Terms-Composite modified double base propellant, debonding, load-Elongation plot and MBRL.

show abstract

“…The predicted storage life of HTPB coating was 15.3 years at 298.15 K under 0 % pre-strain, which was reduced by 13.90 %, 75.69 % and 89.79 % under 3 %, 6 % and 9 % pre-strain, respectively. Shekhar [21] assessed the shelf life of two varieties of composite solid propellant including cartridge-loaded (CLCP) and case-bonded (CBCP) propellants using stress-strain curves from uni-axial tensile testing. He took tensile strength as degradation state indicator or better aging indicator and confirmed that CLCP has slower degradation rate than CBCP.…”

Section: Introductionmentioning

confidence: 99%

The use of the change of elongation for comparison of the shelf life of composite solid propellants in the air and nitrogen atmospheres

Keshavarz

Karimi

Goodarzi

et al. 2021

Zeitschrift anorg allge chemie

View full text Add to dashboard Cite

This work uses the change of elongation with temperature in a composite solid propellant to assess its shelf life for the air and nitrogen atmospheres applying two methods for the temperature parameterization of the measured quantity, the Arrhenius and Berthelot equation. The samples of the composite propellant contain aluminum (Al), ammonium perchlorate (AP), and hydroxyl-terminated polybutadiene (HTPB) as well as curing agent toluene diisocyanate (TDI), which were aged at three temperatures 323.15, 333.15, and 343.15 K during 15, 30, 60, 90, and 120 days. Stress-strain curves for the samples are inves-tigated to study the effects of the atmospheres of air and nitrogen on the samples. The ratio of the changes in percentage elongation (ɛ) to the initial value of percentage elongation (ɛ r ) is the degradation criterion, which is defined as a reduction of the elongation to less than 50 %. The calculated activation energy by the Arrhenius method is 80.48 kJ mol À 1 for the air atmosphere. The shelf life of the samples were found to be 7.912 and 7.906 years (air atmosphere) to 23.38 and 23.36 years (nitrogen atmosphere) as well as Arrhenius and Berthelot methods, respectively.

show abstract

Studies on Stress-Strain Curves of Aged Composite Solid Rocket Propellants

Cited by 21 publications

References 6 publications

Effect of Pressure on Mechanical Properties of Composite Propellant

Effect of Pressure on Mechanical Properties of Composite Propellant

Desirability and Assessment of Mechanical Strength Characteristics of Solid Propellant for Use in Multi Barrel Rocket Launcher

The use of the change of elongation for comparison of the shelf life of composite solid propellants in the air and nitrogen atmospheres

Contact Info

Product

Resources

About