학술논문
HTPB推进剂细观损伤及载荷传递行为数值模拟 / Numerical simulation of meso-damage and load transfer behavior of HTPB propellant
Document Type
Academic Journal
Author
逯晗斗; 陈雷; 胡松启; 于庆民; 白帅帅; 刘殊远; LU Handou; CHEN Lei; HU Songqi; YU Qingmin; BAI Shuaishuai; LIU Shuyuan
Source
固体火箭技术 / Journal of Solid Rocket Technology. 46(6):874-885
Subject
Language
Chinese
ISSN
1006-2793
Abstract
为了研究端羟基聚丁二烯(HTPB)推进剂细观损伤及传力特性,基于粘超弹性材料本构和双线性内聚力模型,结合DIGIMAT建立了推进剂代表体积单元(RVE)模型,通过应力集中因子和载荷传递系数定量分析了颗粒和基体之间的载荷传递及应力集中程度.结果表明,颗粒位置随机并不会对力学性能造成明显的影响,但颗粒发生"脱湿"的位置改变可能会影响裂纹扩展的路径;颗粒的长径比越大,应力集中现象越明显,相较于椭圆形颗粒,圆形颗粒的界面更容易发生"脱湿"损伤;大颗粒含量越高,初始阶段颗粒的应力集中程度越大,基体的应力集中程度越小,载荷传递的效率越高,脱粘后变化趋势相反,同时大颗粒含量的增加会加快界面损伤的进程,加剧界面损伤的程度;颗粒体积分数越大,颗粒和基体的应力集中因子都将逐渐增加,初始阶段载荷传递效率越低,脱粘后载荷传递效率越高.
In order to study the micro-damage and transmission characteristics of hydroxyl-terminated polybutadiene(HTPB)propellant,a representative volume element(RVE)model of the propellant was established based on viscohyperelastic material con-stitutive and bilinear cohesive force models,combined with DIGIMAT.The load transfer and stress concentration between particles and matrix were quantitatively analyzed by stress concentration factor and load transfer coefficient.The research results show that the random position of particles did not have a significant effect on the mechanical properties,but the change of particle position due to dewetting may affect the crack propagation path.The greater the aspect ratio of the particle,the more obvious the stress concentration phenomenon,and circular particles are more likely to experience dewetting damage than elliptical particles.The higher the particle content,the greater the initial stage stress concentration of the particle;the smaller the stress concentration of the matrix,and the higher the efficiency of load transfer.The trend is reversed after dewetting,and the increase in the content of large particles will ac-celerate the process of interface damage and exacerbate the degree of interface damage.The larger the volume fraction of particles,the higher stress concentration factor of particles and matrix;the lower the efficiency of load transfer in the initial stage,the higher the efficiency of load transfer after dewetting.
In order to study the micro-damage and transmission characteristics of hydroxyl-terminated polybutadiene(HTPB)propellant,a representative volume element(RVE)model of the propellant was established based on viscohyperelastic material con-stitutive and bilinear cohesive force models,combined with DIGIMAT.The load transfer and stress concentration between particles and matrix were quantitatively analyzed by stress concentration factor and load transfer coefficient.The research results show that the random position of particles did not have a significant effect on the mechanical properties,but the change of particle position due to dewetting may affect the crack propagation path.The greater the aspect ratio of the particle,the more obvious the stress concentration phenomenon,and circular particles are more likely to experience dewetting damage than elliptical particles.The higher the particle content,the greater the initial stage stress concentration of the particle;the smaller the stress concentration of the matrix,and the higher the efficiency of load transfer.The trend is reversed after dewetting,and the increase in the content of large particles will ac-celerate the process of interface damage and exacerbate the degree of interface damage.The larger the volume fraction of particles,the higher stress concentration factor of particles and matrix;the lower the efficiency of load transfer in the initial stage,the higher the efficiency of load transfer after dewetting.