宽温宽应变率范围下PBX炸药破坏准则及细观变形机制研究

项目名称： 宽温宽应变率范围下PBX炸药破坏准则及细观变形机制研究

项目编号： No.11472257

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 黄西成

作者单位： 中国工程物理研究院总体工程研究所

项目金额： 100万元

中文摘要： 高能炸药的变形与破坏直接关系到炸药构件在全寿命周期的结构可靠性与安全性，开展炸药在复杂应力状态下、宽温宽率范围的变形与损伤研究，对武器设计与评估具有极其重要的作用，需求迫切。本项目面向武器装备研制中出现的亟待解决的技术瓶颈问题及共性科学问题，针对典型PBX开展复杂应力状态下宽温(-20至80 C)宽应变率(准静态至10^2/s)范围内的实验技术研究，对典型PBX进行不同温度和不同应力状态下的实验测试，获得炸药较完整的力学性能数据；开展PBX宽温宽率范围的粘弹性理论分析，建立材料强度模型以及宽温宽率的率-温等效模型，揭示PBX炸药热环境变形机制与常温高率形机制之间的内在联系；开展细观组织形貌与细观力学分析，揭示固体炸药温度-应变率相关的变形、损伤及破坏机制，基于脆性多相非均质材料细观力学理论分析以及冲击动力学实验研究，建立复杂应力状态下典型PBX炸药温度-应变率相关的三维本构与破坏准则。

中文关键词： 高聚物粘结炸药；破坏准则；本构模型；应变率效应；温度效应

英文摘要： The deformation and failure of high energy PBXs greatly influence the structural reliability and safety of PBX components during their life cycle. It is increasingly desired to study the deformation behaviors and failure characteristics of PBXs over a wide range of temperature and strain rate under complex stress states, and it is also of great importance on engineering design and assessment of weapon system. This study will aim at the technical bottleneck and general problems in science that are required to solve emergently in development periods of special weapon equipments. This proposed project for fundamental research focuses on experimental techniques for mechanical measurement of PBXs over wide ranges of temperature(-20 to 80 C) and strain rate(10^-4 to 10^2/s) under complex stress states. The static and dynamic properties of typical PBX under different stress states and at various temperatures will be measured experimentally, and primary mechanical properties will be obtained systematically. Studies into viscoelasticity of PBX for wide range of strain rate will be performed so that the creep strength model and rate-temperature equivalency available for wide ranges of temperature and strain rate can be constructed. The intrinsic relations between the deformation mechanisms under thermal environment and high velocity deformation mechanisms at normal temperature will be revealed. Optical microscopic and mesomechanics analyses will be conducted to investigate the deformation, damage and fracture mechanisms of PBX at various temperature and strain rates. Based on mesomechanics for heterogeneous brittle materials and dynamic experimental researches, the three dimensional temperature-strain rate dependent constitutive model and failure criterion for typical PBX subjected to complex stress states will be proposed.

英文关键词： PBX;failure criterion;constitutive model;strain rate effect;temperature effect