摘要
为克服传统“经验型”材料研发模式和“唯象法”构建材料计算模型的不足,构建了一种基于材料基因工程的复合固体推进剂单轴拉伸性能预估方法;以高氯酸铵/铝/端羟基聚丁二烯(AP/Al/HTPB)推进剂为例,将填料堆积微结构定义为材料基因之一,建立了可反映推进剂配方的填料微结构最小代表性单元,分别确定了决定填料、基体、填料-基体界面力学性能的材料基因,并建立了材料基因与推进剂单轴拉伸性能之间的构效关系,获得了单轴拉伸条件下推进剂内部的损伤演变规律及应力—应变响应。结果表明,AP/Al/HTPB推进剂的应力—应变曲线可分为弹性段、黏弹性段和损伤段3个阶段;基体的黏弹性形变和填料脱湿会导致推进剂黏弹性模量下降;应变大于15.37%时,脱湿首先发生在粗粒径颗粒上方,随后以先快速、后平稳的趋势沿粗颗粒周向扩展;应变大于21.19%时,中等粒径颗粒开始脱湿;在0~25%的应变范围内细颗粒与基体始终黏接完好。
In order to overcome the shortcomings of the traditional“empirical”and“phenomenological”methods on the material calculation model building,a prediction method for uniaxial tensile properties of AP/Al/HTPB composite solid propellant based on genetic engineering of materials was established.Taking ammonium perchlorate/aluminum/hydroxyl terminated polybutadiene(AP/Al/HTPB)propellant as an example,the fillers packing structure in the propellant was defined as one of the materials genes,and the minimum representative unit which could reflect the propellant formulation was established.The materials genes,which determine the mechanical properties of fillers,matrix,and the filler-matrix interface were determined.The dewetting evolution and the stress-strain response of the propellant under uniaxial tension were obtained.The results showed that the stress-strain curve of the AP/Al/HTPB propellant under uniaxial tension could be divided into three stages.Both the viscoelastic deformation of the matrix and the dewetting of the fillers could lead to the decrease of the viscoelastic modulus of the propellant.When the strain is higher than 15.37%,the dewetting firstly occurs on the coarse particle,and then expands along the circumferential of the coarse particle in a trend of rapid first and then steady.When the strain is greater than 21.19%,the medium-sized particles started to dewetting.While within the strain range of 0-25%,the fine particles always well bonded to the matrix.
作者
董戈
张炜
周星
邓蕾
DONG Ge;ZHANG Wei;ZHOU Xing;DENG Lei(College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410072, China)
出处
《火炸药学报》
EI
CAS
CSCD
北大核心
2021年第3期295-300,共6页
Chinese Journal of Explosives & Propellants
基金
国防科技基础加强计划(No.2019JCJQZD178)
稳定支持项目基金(No.20-JJGKGYYZ0024)
重点实验室开放基金(No.STACPL220181B05)。
关键词
材料基因工程
复合固体推进剂
单轴拉伸
脱湿
跨尺度计算
genetic engineering of materials
composite solid propellant
uniaxial tension
dewetting
multi-scale calculation
