考虑混凝土孔隙压实效应的球形空腔膨胀理论  

A spherical cavity expansion theory of concrete considering voids compacted effects

作　　者：李志康[1,2] 黄风雷[1] 

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081 [2]西北核技术研究所,西安710024

出　　处：《岩土力学》2010年第5期1481-1485,共5页Rock and Soil Mechanics

摘　　要：根据混凝土材料动态响应的特点,将常规弹速范围内混凝土球形空腔的动态响应区域划分为弹性区、开裂区和孔隙压实区,孔隙压实区的混凝土材料采用两段式线性状态方程和考虑拉伸破坏的Mohr-Coulomb屈服准则描述。运用相似变换方法推导了球形空腔动态膨胀响应的理论表达式,采用Runge-Kutta-Felhberg数值方法给出了球形空腔动态响应的数值解。结果表明,运用该理论建立的侵彻模型与试验结果具有良好的一致性。Based on the dynamic response characteristic of concrete,the dynamic response of spherical cavity expansion for conventional projectile velocity is divided into three regions,i.e.elastic,cracked and voids compacted regions.The constitutive description of voids compacted region idealized pressure-volumetric strain as bilinear compressible and idealized shear strength pressure as Mohr-Coulomb criterion with a tension cutoff.The dynamic response expression of spherical cavity expansion is derived by similarity methods;and the dynamic response numerical solution is given by Runge-Kutta-Felbberg numerical method.The results show that the predictions from the penetration model based on the theory are consistent with experiment data.

关 键 词：球形空腔膨胀理论 混凝土 孔隙压实效应 侵彻 

分 类 号：O385[理学—流体力学]