摘要
对比分析了现有的PBX蠕变模型,提出运用基于修正时间硬化理论来模拟机械加工过程中的蠕变行为,该模型有紧凑的数学表达式和较少的待定参数。为验证模型的有效性,选取以奥克托今(HMX)为基的PBX进行常温条件下的压缩蠕变试验并进行了模型研究,确定了全部模型参数。采用有限元软件对圆柱体压缩试样的压缩蠕变实验进行仿真。理论分析以及有限元数值仿真表明该模型用于仿真计算时,其结果与试验获得蠕变数据相当吻合,可以运用于PBX部件加工的形位变化仿真。
A reasonable model of plastic bonded exploisve （PBX） substantiated by creep property is useful for finite element simulation of machining PBX components. Modified time hardening theoretical （MTHTT） model,which has compact form and less undetermined parameters,is promoted in this paper to describe creep behavior of PBX. A HMX based PBX is employed to conduct compressive creep tests. The model parameters are determined and the corresponding fitting details are discussed for validating the model. Meanwhile, finite element software is used to simulate the creep deformation of cylinder specimens subjected to the experimental stresses. Theoretical analysis and the simulation show that the model agrees well with the results of creep test and it could be used in simulating the deformation of PBX components during the machining process.
出处
《含能材料》
EI
CAS
CSCD
2008年第1期34-36,共3页
Chinese Journal of Energetic Materials
基金
国家自然科学基金(No.10602054)
中国工程物理研究院化工材料研究所所长基金资助项目(No.62601080314)
关键词
材料力学
PBX
蠕变模型
修正时间硬化理论
有限元仿真
materials mechanics
polymer bonded explosive（PBX）
creep model
modified time hardening theory （MTHT）
finite element simulation
