CAJ | 학술논문

为准确模拟固含量不同时复合固体推进剂细观损伤产生、演化、聚合至宏观裂纹形成的过程，及该过程对复合固体推进剂非线性力学性能的影响，采用分子动力学方法建立了复合固体推进剂颗粒夹杂模型，根据Surface-based cohesive方法，在AP颗粒与基体之间的界面处设置接触损伤。利用有限元法，对含损伤颗粒夹杂模型进行计算，通过对比数值仿真结果，研究了固含量及界面损伤对复合固体推进剂细观损伤形貌及宏观力学性能的影响。结果表明，当固含量较低时，颗粒与基体之间界面损伤的聚合往往发生在少部分颗粒之间，随固含量增大，参与界面损伤聚合的颗粒逐渐增多，形成的宏观裂纹越来越明显；颗粒与基体之间的界面损伤，对复合固体推进剂非线性力学性能影响较大，不可忽略。
위준학모의고함량불동시복합고체추진제세관손상산생、연화、취합지굉관렬문형성적과정，급해과정대복합고체추진제비선성역학성능적영향，채용분자동역학방법건립료복합고체추진제과립협잡모형，근거Surface-based cohesive방법，재AP과립여기체지간적계면처설치접촉손상。이용유한원법，대함손상과립협잡모형진행계산，통과대비수치방진결과，연구료고함량급계면손상대복합고체추진제세관손상형모급굉관역학성능적영향。결과표명，당고함량교저시，과립여기체지간계면손상적취합왕왕발생재소부분과립지간，수고함량증대，삼여계면손상취합적과립축점증다，형성적굉관렬문월래월명현；과립여기체지간적계면손상，대복합고체추진제비선성역학성능영향교대，불가홀략。
To better simulate the process that mesoscopic damage evolves into macro cracks of solid propellants and the effect of this process on the nonlinear mechanical properties of composite solid propellants, the molecular dynamics method was adopted to create particle packing models of solid propellants. Based on the surface-based cohesive approach, interfacial damages between par-ticles and the bind are created. The finite element method was adopted to compute the packing models with damage and the effect of solid content and interfacial damage on mesoscopic damage morphology and mechanical properties of solid propellant has been re-searched by comparing the numerical simulation results. The results show that interfacial damage always gathers among a few parti-cles when the solid content is low. With the increasing of solid content, particles involved in the process of interfacial damage aggre-gation increase more and more. The nonlinear mechanical properties of composite solid propellants, which are affected greatly by in-terfacial damage between particles and the binder, can not be ignored.