Abstract:Accelerated aging tests under pre‐strain were conducted on HTPB‐based composite solid propellant with the goal of investigating the effect of pre‐strain aging on its microdamage properties. The tensile fracture morphologies, stress‐strain curve and dissipative energy density of propellant samples were analyzed. Results showed that there was no obvious dewetting macroscopically when the pre‐strain was less than 9 %, but the pre‐strain can still cause microdamage of propellant interface. The microdamage of prope… Show more
“…HTPB propellants, distinguished by their stable mechanical properties and high energy efficiency, are extensively employed in contemporary high-performance solid rocket engines [4,[37][38][39][40][41][42]. As previously noted, the influence of external mechanical stresses on the aging behavior of HTPB propellants in such applications is significant.…”
Section: Introductionmentioning
confidence: 99%
“…For instance, Wang [37] examined the mechanical properties of HTPB propellants under varying aging durations and pre-strain conditions, subsequently developing a comprehensive stressstrain behavior model. Additionally, Zhou [38] discovered that the micro-damage characteristics of HTPB propellants under different pre-strain conditions are intricately linked to the aging temperature. These studies lay a crucial scientific groundwork for comprehending the aging behavior of HTPB propellants in complex environments subjected to external mechanical stresses.…”
This study employed macroscopic uniaxial compression tests at low and medium strain rates, coupled with microscopic electron microscopy, to extensively analyse the impact of thermomechanical coupled aging on the accelerated aging of Hydroxyl‐terminated Polybutadiene (HTPB) propellants, contrasting it with the effects of isolated factors such as heat and dynamic reciprocating force. Results indicate that at various environmental temperatures (323 K, 343 K, and 363 K), thermomechanical coupled aging more significantly affects HTPB propellants than isolated factors. This effect is macroscopically evident in increased ease of deformation, permanent deformation during aging, continual increase in dissipated energy, and a decrease in average stress and ultimate strain post‐aging. Microscopically, the effect predominantly arises from the interplay between matrix thermal degradation and particle fragmentation, which rapidly accumulate and substantially impact the material's macroscopic mechanical properties. Furthermore, as the aging temperature rises, the alterations in both macroscopic mechanical properties and microscopic morphology of HTPB propellants become more pronounced. However, overly high temperatures may swiftly result in substantial material performance deterioration. Consequently, while elevating temperature effectively accelerates thermomechanical aging, the potential adverse effects on material performance must be judiciously considered. This underscores the necessity of balancing temperature regulation with aging efficiency enhancement in HTPB propellants to ensure effective control and quantitative assessment of the aging process, while minimizing material degradation.
“…HTPB propellants, distinguished by their stable mechanical properties and high energy efficiency, are extensively employed in contemporary high-performance solid rocket engines [4,[37][38][39][40][41][42]. As previously noted, the influence of external mechanical stresses on the aging behavior of HTPB propellants in such applications is significant.…”
Section: Introductionmentioning
confidence: 99%
“…For instance, Wang [37] examined the mechanical properties of HTPB propellants under varying aging durations and pre-strain conditions, subsequently developing a comprehensive stressstrain behavior model. Additionally, Zhou [38] discovered that the micro-damage characteristics of HTPB propellants under different pre-strain conditions are intricately linked to the aging temperature. These studies lay a crucial scientific groundwork for comprehending the aging behavior of HTPB propellants in complex environments subjected to external mechanical stresses.…”
This study employed macroscopic uniaxial compression tests at low and medium strain rates, coupled with microscopic electron microscopy, to extensively analyse the impact of thermomechanical coupled aging on the accelerated aging of Hydroxyl‐terminated Polybutadiene (HTPB) propellants, contrasting it with the effects of isolated factors such as heat and dynamic reciprocating force. Results indicate that at various environmental temperatures (323 K, 343 K, and 363 K), thermomechanical coupled aging more significantly affects HTPB propellants than isolated factors. This effect is macroscopically evident in increased ease of deformation, permanent deformation during aging, continual increase in dissipated energy, and a decrease in average stress and ultimate strain post‐aging. Microscopically, the effect predominantly arises from the interplay between matrix thermal degradation and particle fragmentation, which rapidly accumulate and substantially impact the material's macroscopic mechanical properties. Furthermore, as the aging temperature rises, the alterations in both macroscopic mechanical properties and microscopic morphology of HTPB propellants become more pronounced. However, overly high temperatures may swiftly result in substantial material performance deterioration. Consequently, while elevating temperature effectively accelerates thermomechanical aging, the potential adverse effects on material performance must be judiciously considered. This underscores the necessity of balancing temperature regulation with aging efficiency enhancement in HTPB propellants to ensure effective control and quantitative assessment of the aging process, while minimizing material degradation.
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