Effect of Pressure on Mechanical Properties of Composite Propellant

Bihari, Bipin Kumar; Kumaraswamy, A.; Jain, Mukesh; Rao, Nellutla P. N.; Murthy, Krothapalli Prabhakara Subrahmania

doi:10.1002/prep.202000299

Cited by 19 publications

(25 citation statements)

References 9 publications

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“…Increasing the confining pressure exhibits little impact on the initial modulus of material but prolongs the linear elastic stage of the curve, causing the yield section of the curve to recede, and the maximum tensile and fracture strength of the sample increases by varying degrees. Maximum elongation and elongation at break also increase with environmental pressure, which are different from the results of HTPB propellant [22,23]. This may be caused by the particles' size and compositions [22].…”

Section: Determine the Value Of Each Parametermentioning

confidence: 57%

“…The wide temperature-gas confining pressure test system was developed by Zhang et al [22], a high-pressure gas was used to form the confining pressure environment, and the temperature of highpressure gas and propellant samples was controlled by convection heat transfer. Bihari et al [23] pointed that the strain capability of HTPB propellant increased as the strain rate at a given pressure increased, and the maximum stress capability was in the pressure range of 4 to 6 MPa.…”

Section: Introductionmentioning

confidence: 99%

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Constitutive Model of N15 Propellant considering the Confining Pressure Effect

Han

Wang³

et al. 2021

International Journal of Aerospace Engineering

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To describe the effect of confining pressure on the mechanical responses of N15 propellant, a constitutive model considering the confining pressure effect was first established for N15 propellant based on the elastic-viscoelastic correspondence principle. Then, the mechanical properties of N15 solid propellant under different confining pressures were obtained using confining pressure test system, and the obtained results indicate that the initial modulus of propellant did not change with confining pressure, but the maximum tensile strength, rupture strength, the maximum elongation, and elongation at break increased with increasing confining pressure. In conjunction with propellants’ mesoscopic structure and cross-section analysis, the mechanical mechanism of confining pressure effect on propellant was initially disclosed. Due to confining pressure, the particle dewetting inside the propellant was reduced, the hole propagation was delayed, and crack extension inhibited germination, proving that confining pressure has a strengthening impact on the propellant. Finally, assuming that the model parameters were dependent on pressure, the model parameters acquisition and validation were conducted. The results demonstrated that constitutive model can describe confining pressure influence on the mechanical properties of N15 propellant accurately.

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Section: Determine the Value Of Each Parametermentioning

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Constitutive Model of N15 Propellant considering the Confining Pressure Effect

Han

Wang³

et al. 2021

International Journal of Aerospace Engineering

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“…Thence, in recent years, Zhang et al [23] conducted research on the coupled effects of pressure and temperature on Hydroxy-Terminated Polybutadiene (HTPB) propellants, revealing that the tensile stress-strain curves had no apparent dewetting point under superimposed pressure. Bihari et al [24] found that the tensile stress increased with pressure, while the fracture strain almost kept constant. These results indicated that the differences in composition contents and percentages of solid propellants would also cause different performances under confining pressure conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Bihari et al. [24] found that the tensile stress increased with pressure, while the fracture strain almost kept constant. These results indicated that the differences in composition contents and percentages of solid propellants would also cause different performances under confining pressure conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Influence of Confining Pressure on Thermal Aged CMDB Propellant

Liu

Chen

et al. 2022

Propellants Explo Pyrotec

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With the purpose of investigating the influences of aging time and confining pressure on the mechanical properties of a composite modified double‐based (CMDB) propellant, uniaxial tension tests of the propellant with various accelerated aging times were conducted under various confining pressure conditions (relative atmospheric pressure 0, 0.5±0.05, 2±0.05 and 6±0.05 MPa). The stress‐strain behaviors at various experimental conditions were analyzed. The results show that stress‐strain curves can be divided into three stages, the initial tensile stage, the elastic stage, and the damage growth stage. Additionally, the key mechanical parameters (e. g., the maximum tensile strength) show a strong dependence on aging time and confining pressure. The ultimate strain decreases with increasing aging time, while the tensile strength first decreases and later increases with aging time. It was observed that the maximum tensile strength and elastic modulus of the CMDB propellant decrease with confining pressure. Furthermore, the damage evolution curves can be divided into two stages. The later nonlinearity of the stress‐strain curves is mainly induced by the initiation and propagation of macro‐cracks. It is believed that these findings will help to accurately analyze the structural integrity of CMDB propellant grains during ignition pressurization loading after a long storage time.

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“…A lot of research has been carried out on the tensile and compressive mechanical properties of HTPB propellants in the past period of time [1][2][3][4][5][6]. The effects of temperature and loading speed on the mechanical properties of propellant under uniaxial loading were studied [7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of HTPB Propellant under Shear Loading at Low Temperature

Wang

2021

Propellants Explo Pyrotec

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A new type of shear loading fixture and tensile testing machine with a refrigeration system was utilized to conduct Hydroxyl-terminated polybutadiene (HTPB) propellant low strain rate (0.01 ~1.00 s À 1 ) shear loading tests at low temperature (223 K ~298 K). The shear strength and shear modulus of the HTPB propellant under different loading conditions were studied, and the master curves of the shear mechanical properties were constructed. It is found that the shear strength of HTPB propellant increases with increasing of shear strain rate and decreasing of temperature. The change of shear strength with temperature and strain rate conforms to the linear double logarithmic relationship. The initial shear modulus has a good linear double logarithmic relationship with the strain rate but changes nonlinearly with the logarithmic temperature. The shift factor of HTPB propellant shear strength and initial shear modulus changes exponentially with temperature after taking logarithm. The master curve of the initial shear modulus of HTPB propellant shows an "S"-shaped change trend, and a linear equation is used to fit the master curve of shear strength to obtain a better fitting effect.

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Effect of Pressure on Mechanical Properties of Composite Propellant

Cited by 19 publications

References 9 publications

Constitutive Model of N15 Propellant considering the Confining Pressure Effect

Constitutive Model of N15 Propellant considering the Confining Pressure Effect

Experimental Investigation on the Influence of Confining Pressure on Thermal Aged CMDB Propellant

Mechanical Properties of HTPB Propellant under Shear Loading at Low Temperature

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