骨料对刚性弹正侵彻混凝土过程的影响机理  

Impact mechanisms of aggregate on rigid projectile normal penetration into concrete target

作　　者：张杰 王志华[1,2] 王志勇 树学峰[1,2] ZHANG Jie;WANG ZhiHua;WANG ZhiYong;SHU XueFeng(Institute of Applied Mechanics,College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Key Laboratory of Material Strength and Structural Impact,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学机械与运载工程学院应用力学研究所,太原030024 [2]太原理工大学材料强度与结构冲击山西省重点实验室,太原030024

出　　处：《中国科学：技术科学》2021年第3期272-280,共9页Scientia Sinica(Technologica)

基　　金：国家自然科学基金(批准号:11390362,11702186)资助项目。

摘　　要：混凝土的细观侵彻破坏机理已成为工程防护领域的重要研究方向.本文以三维混凝土细观模型为基础,系统分析了刚性弹正侵彻混凝土过程中,骨料强度、粒径、体积分数等主要细观参量对弹体偏转及侵彻阻力的影响规律.明确了深侵彻过程中弹体偏转的四个阶段,并以静止后弹体偏离原运动姿态的角度为衡量指标,获得了各变量作用下的弹道偏转规律及相应临界值;定量研究了骨料特征变量对靶体侵彻阻力的影响,并以此得到了混凝土均质化假设的适用条件、界定了骨料体积分数及骨料最大粒径对靶体侵彻阻力的影响上限.通过本文研究,系统阐述了混凝土中细观骨料对刚性弹正侵彻过程的影响机理,相关结论可为工程防护结构优化及安全评估提供理论依据.Concrete failure mechanisms under projectile penetration at a mesoscale level have recently attracted researchers’attention.Based on the three-dimensional(3D)mesoscale concrete model,the influences of aggregate strength,size,and volume fraction on deflection angle and penetration resistance of projectile were analyzed during the process of rigid projectile penetration into the concrete.Four stages of projectile deflected during the process of depth penetration were described.The measurement of the deflection angle of the projectile during the penetration process revealed the factors affecting ballistic stability.These factors were investigated quantitatively,and their critical values affecting the deflection angle of projectile were obtained.The effects of the key variables of coarse aggregate on penetration resistance were quantitatively studied.Then,the applicable conditions to satisfy the homogeneous assumption and the upper bounds of aggregate size and volume fraction were identified.The latter influenced the penetration resistance and were dependent on the aggregate configurations.Finally,the influencing mechanisms of coarse aggregate on the rigid projectile normal penetration into mesoscale concrete were described.The results reported here provide a theoretical and practical background for design optimization and safety assessment for protective engineering structures.

关 键 词：混凝土 细观模型 骨料 侵彻阻力 弹体偏转 

分 类 号：TJ410[兵器科学与技术—火炮、自动武器与弹药工程] TU37[建筑科学—结构工程]