Crack propagation velocity and fracture toughness of hydroxyl-terminated polybutadiene propellants: Experiments and simulations

Wang, Tingyu; Xu, Jie; Li, Hui; Ding, Wenyi; Liu, Jiaming; Chen, Xiong

doi:10.1016/j.engfracmech.2021.108034

Cited by 15 publications

(12 citation statements)

References 27 publications

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“…Especially at low temperatures (environmental temperature of À40 C), the mechanical performance significantly deteriorates compared to room temperature (20 C). [21][22][23] This can cause the propellant grain to become brittle and fracture under high pressure, resulting in an increased burning surface and even chamber detonation. 24 Unlike typical high-energy explosives like RDX and HMX, industrially produced NQ crystals exhibit a rod-like shape.…”

Section: Introductionmentioning

confidence: 99%

Effect of particle size distribution on the cryogenic mechanical properties of triple‐base propellants

Li,

Huang,

Wang

et al. 2024

Polymer Composites

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Fillers play a decisive role in the mechanical properties of polymer composites. In this paper, different particle sizes of nitroguanidine were obtained to regulate the internal filler structure of triple‐base propellants (TBP) to improve their mechanical response in different environments. A series of morphological and structural characterizations on nitroguanidine (NQ) particles were conducted using techniques. The results indicated that the obtained NQ particles maintained a high level of crystalline quality while preserving their molecular integrity. The mechanical properties of TBP were systematically evaluated under various loading conditions, including cryogenic tensile, compressive, and impact loads, as well as dynamic thermomechanical effects. Additionally, three‐point bending simulations were employed to elucidate the mechanical responses and damage mechanisms. Under axial tensile and compressive loads, reducing the particle size of NQ significantly enhanced the tensile and compressive strength. The maximum tensile strength and compressive strength can reach 344.62 MPa and 104.79 MPa. Moreover, the compressive failure mode transitioned from cracking to axial shrinkage. Conversely, when subjected to radial bending loads, TBP exhibited contrasting behavior, including a decrease in the glass transition temperature from 84.73°C to 76.93°C and a non‐monotonic trend in impact strength (initially increasing from 4.96 to 8.85 kJ/m2 and then decreasing to 2.27 kJ/m2). This study provides valuable insights into the mechanical performance of TBP, supporting the development of high‐energy, high‐strength TBP formulations.Highlights SEM analysis confirms the pronounced orientation effect of rod‐like NQ. The orientation and particle size of NQ decide TBP's radial impact resistance. Submicron NQ enhances the compression resistance property of TBP. Submicron NQ brings about a shift in the microscopic damage morphology of TBP.

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Section: Introductionmentioning

confidence: 99%

Effect of particle size distribution on the cryogenic mechanical properties of triple‐base propellants

Li,

Huang,

Wang

et al. 2024

Polymer Composites

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“…Under the action of various complex loads, the mesoscopic structure of solid propellant is easily changed, accompanied by phenomena such as interface dewetting, particle breakage, micro-crack initiation and micro-pore propagation along the interface and so on. These phenomena are manifested as crack propagation and fracture at the macro level, which seriously affect the structural integrity of solid rocket motor charge [2].…”

Section: Introductionmentioning

confidence: 99%

Research progress on crack propagation behavior of solid propellant

Wu¹,

Fu²,

Li³

2023

AETR

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Crack sprouting will lead to the mechanical properties of propellant degradation, and the additional combustion surface formed by crack propagation may cause over-pressurization, resulting in uneven combustion of propellant, significantly changing the thrust characteristics of the engine, reducing the range of the vehicle, and may even cause catastrophic accidents such as explosions. Therefore, the study of crack propagation law of solid rocket propellant pillar is an important basis to ensure the structural integrity and safety of the engine. In order to study the crack propagation pattern of propellant pillar under different working conditions, three aspects of propellant crack initiation criterion, crack propagation model, and crack propagation influencing factors are systematically reviewed. On this basis, the next research focus is sorted out, and it is considered that the construction of crack propagation model by establishing a multi-scale model, the characterization of crack propagation by using various test characterization means, and the analysis of damage evolution under the coupling of multiple working conditions will be the next research focus.

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“…Test results reveal that the effects of loading rate, initial crack length and sample thickness on crack behaviors are considered small relative to that of temperature and confining pressure. Furthermore, the strain field around the crack tip and the related fracture mechanisms of solid propellants at the aforementioned test conditions were discussed by Liu and Ide et al [15][16][17]. To further simulate the crack propagation in edge-cracked tension sample of solid propellant, Han et al [18] proposed a power law rate-independent cohesive zone model.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the strain field around the crack tip and the related fracture mechanisms of solid propellants at the aforementioned test conditions were discussed by Liu and Ide et al. [15–17]. To further simulate the crack propagation in edge‐cracked tension sample of solid propellant, Han et al.…”

Section: Introductionmentioning

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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Crack propagation velocity and fracture toughness of hydroxyl-terminated polybutadiene propellants: Experiments and simulations

Cited by 15 publications

References 27 publications

Effect of particle size distribution on the cryogenic mechanical properties of triple‐base propellants

Effect of particle size distribution on the cryogenic mechanical properties of triple‐base propellants

Research progress on crack propagation behavior of solid propellant

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

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