摘要
基于混凝土两相介质细观模型和Kong-Fang材料模型,将混凝土看作骨料和水泥石两相介质,通过数值模拟得到混凝土的高压状态方程(equation of state,EoS)。骨料和水泥石均采用Kong-Fang材料模型描述,其中破坏面参数自动生成,高压状态方程分别采用分段线性拟合平板撞击实验数据和改进的混合法则得到。该模型和方法得到了已有平板撞击实验的较好验证,并在细观尺度上分析了混凝土中冲击波传播规律,发现数值模拟和已有实验中观测到的压力波动现象是混凝土材料的非均质性引起的。参数敏感性分析结果表明破坏面参数对高压状态方程影响较小,而水灰比对其影响较大。
Based on a two-phase medium concrete mesoscopic model and the Kong-Fang material model,concrete was regarded as composed of cement stone and aggregate.The equation of state(EoS)at high pressures was obtained through numerical simulation.Both the aggregate and cement stone were described by the Kong-Fang material model,in which the failure surface parameters were automatically generated,and the EoS at high pressures was obtained by piecewise linear curve-fitting test data and an improved mixing law.The models above have been verified by existing concrete flyer-plate-impact tests,and the shock wave propagation on mesoscopic level has been analyzed.The fluctuations of pressure observed in numerical simulation and existing tests are mainly due to the heterogeneity of concrete materials.Sensitivity analyses show that the failure surface parameters have negligible effect on EoS at high pressures,while the water-cement ratio greatly affects.
作者
李昊阳
孔祥振
方秦
彭永
崔健
LI Haoyang;KONG Xiangzhen;FANG Qin;PENG Yong;CUI Jian(College of Engineering Defense,Army Engineering University of PLA,Nanjing 210007,China;School of Civil Engineering,Southeast University,Nanjing 211189,China;College of Liberal Arts and Sciences,National University of Defense Technology,Changsha 410073,China;School of Civil Engineering,Tianjin University,Tianjin 300072,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2021年第16期53-60,共8页
Journal of Vibration and Shock
基金
国家自然科学基金(51808550)
中国博士后科学基金(2020M671296)。
