Research on the time–temperature–damage superposition principle of NEPE propellant

Han, Long; Chen, Xiong; Xu, Jie; Zhou, Changsheng; Yu, Jiaquan

doi:10.1007/s11043-015-9280-x

Cited by 16 publications

(5 citation statements)

References 24 publications

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“…Other factors (e. g., loading, pre‐aging time, confining pressure, and damage) have similar effects as the temperature on the change in fractional free volume. Some researchers have proposed several models to characterize the time‐dependent properties of viscoelastic materials by considering different conditions [32–34]. The feasibility of the time‐pressure superposition principle was demonstrated by the experimental data [35].…”

Section: Resultsmentioning

confidence: 99%

Experimental Research on Tensile Mechanical Properties of NEPE Propellant under Confining Pressure

Wang

Meng³

et al. 2020

Propellants Explo Pyrotec

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To study the tensile mechanical properties of the Nitrate Ester Plasticized Polyether (NEPE) propellant under varying confining pressure conditions, uniaxial tensile tests were conducted under different strain rates (from 0.0006667 s−1 to 0.06667 s−1) and confining pressure conditions (from relative atmospheric pressure up 5.4±0.03 MPa) using a new‐designed confining pressure testing machine. Scanning electron microscopy (SEM) was employed to observe the tensile fracture surfaces. The mechanical properties and damage processes of the NEPE propellant under varying confining pressure conditions were studied and analysed. The results indicate that the mechanical properties of propellant materials are remarkably influenced by the varying confining pressure conditions. The ultimate strain and maximum tensile stress increase with increasing confining pressure. Moreover, the maximum tensile stress present a linear‐log relationship with the strain rate under various confining pressure conditions. Yet, the confining pressure has no obvious effect on the initial elastic modulus. The reason for the change of the mechanical properties of the NEPE propellant is that confining pressure delays the initiation and development of damage under the tensile loading. Based on the time‐pressure superposition principle (TPSP), the master curve of maximum tensile strength of the NEPE propellant was constructed. Furthermore, the results can provide a theoretical foundation for the analysis of the structural integrity of propellant grains of a SRM under ignition conditions. Finally, a constitutive model considering compressibility of propellant materials can be constructed.

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Section: Resultsmentioning

confidence: 99%

Experimental Research on Tensile Mechanical Properties of NEPE Propellant under Confining Pressure

Wang

Meng³

et al. 2020

Propellants Explo Pyrotec

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“…According to the characteristics of viscoelastic materials, increasing the rate of load is equivalent to decreasing the temperature, which is the time-temperature equivalence principle [38]. Based on this equivalence principle, researchers have proposed a folded data processing method.…”

Section: Master Curves Of Mechanical Propertiesmentioning

confidence: 99%

Study on Mechanical Properties and Failure Mechanisms of Highly Filled Hydroxy-Terminated Polybutadiene Propellant under Different Tensile Loading Conditions

Wu,

Lu,

Jiang

et al. 2023

Polymers

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To study the mechanical properties of highly filled hydroxy-terminated polybutadiene (HTPB) propellant with 90 wt% solid fillers, the stress–strain curves of the propellant under different temperatures (−50 to 70 °C) and strain rates (0.000476 to 0.119048 s−1) were obtained by uniaxial tensile test. Moreover, to obtain the glass transition temperature and understand the effect of low temperatures on the mechanical properties of the propellant, DMA experiments were carried out. On this basis, the mechanical response laws of the propellant were analyzed, and the master curves of mechanical properties were established. Furthermore, the fracture features of the propellant under typical loading conditions were obtained by SEM, and the corresponding failure mechanisms were analyzed. The results show that the maximum strength decreases with increasing temperature, while the maximum elongation increases with increasing temperature at the same strain rate. The maximum tensile strength increases with increasing strain rate, while the maximum elongation decreases with increasing strain rate at the same temperature. The maximum tensile strength is lowest with a value of 0.35 MPa when the temperature is 343.15 K and the strain rate is 0.000476 s−1, at which time the maximum elongation reaches the highest with a value of 44%. In terms of failure mechanisms, the propellant shows no particle fracture, and the failure modes of the propellant are mainly matrix tearing and dewetting.

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“…Based on the theory that a quick reorientation of the polymer chains at elevated temperatures over short times under an applied constant stress is equivalent to a slow reorientation at longer time and at lower temperatures, a classical method known as TTSP was proposed and applied for predicting the thermal viscoelastic properties of solid propellants in wide intervals of temperatures and loading rates [6,27,28]. Therefore, according to the TTSP and the standard of P. R. C, QJ 2328A-2005, the logarithmic loading rate the logarithmic tensile fracture toughness of HTPB propellant were firstly calculated in this investigation.…”

Section: Master Curve For Fracture Toughnessmentioning

confidence: 99%

Experimental Investigation on Fracture Properties of HTPB Propellant with Circumferentially Notched Cylinder Sample

Wang

et al. 2022

Propellants Explo Pyrotec

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To comprehensively understand the fracture properties of solid propellants, the mode I tensile fracture toughness tests at different temperatures (253.15-343.15 K) and loading rates (2-500 mm/min) were conducted on the newly designed circumferentially notched cylinder sample with different initial crack sizes (4.5 and 6.5 mm) for hydroxyl-terminated polybutadiene (HTPB) propellant. Test results reveal that the shape of the tensile fracture stress-strain curves was not significantly influenced by temperature, loading rate and the initial crack size. Higher loading rate and lower temperature can lead to a rise in the tensile fracture toughness of HTPB propellant described by the stress intensity factor, however, continuously increasing loading rate cannot dramatically improve this fracture toughness beyond the rate of 250 mm/min. In addition, the fracture toughness is more sensitive to temperature. Furthermore, the variation of the initial crack size causes obvious changes in the fracture toughness with the coupled effects of low temperature and higher loading rates. At these test conditions, a higher tensile fracture toughness can be obtained with the shorter initial crack. For all the test conditions, there is a linear rise in the strain corresponding to the fracture toughness as temperature increases. Meanwhile, this strain increases with the shorter initial crack. Whereas, the effect of loading rate on this strain is complex. Based on the time-temperature superposition principle (TTSP), the master curves with a log-curvilinear form were constructed to predict the mode I tensile fracture toughness of the propellant at different initial crack sizes in a wide range of loading conditions.

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Research on the time–temperature–damage superposition principle of NEPE propellant

Cited by 16 publications

References 24 publications

Experimental Research on Tensile Mechanical Properties of NEPE Propellant under Confining Pressure

Experimental Research on Tensile Mechanical Properties of NEPE Propellant under Confining Pressure

Study on Mechanical Properties and Failure Mechanisms of Highly Filled Hydroxy-Terminated Polybutadiene Propellant under Different Tensile Loading Conditions

Experimental Investigation on Fracture Properties of HTPB Propellant with Circumferentially Notched Cylinder Sample

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