基于混凝土拉伸损伤的侵彻混凝土数值模拟研究  

Numerical Study on Penetrating Concrete Targets Using DynamicConstitutive Considering Tensile Damage

作　　者：刘志林 史文卿[1] 蒋东[1] 马爱娥[1] LIU Zhilin;SHI Wenqing;JIANG Dong;MA Aie(Beijing Institute of Space Long March Vehicle,Beijing 100076,China)

机构地区：[1]北京航天长征飞行器研究所,北京100076

出　　处：《弹道学报》2023年第3期55-60,共6页Journal of Ballistics

摘　　要：为了获得动能弹侵彻混凝土介质时混凝土动态响应过程,采用考虑拉伸损伤的新动态混凝土强度模型结合HJC状态方程,建立混凝土材料模型,基于试验数据对相同速度动能弹侵彻不同厚度混凝介质过程进行数值模拟研究。通过LS-DYNA用户自定义本构开发接口实现新混凝土模型嵌入,采用基于拉伸失效损伤的最大拉伸主应变表征侵彻过程中裂纹分布,对比分析弹体贯穿不同厚度靶板的过载、剩余速度以及靶体开坑和崩落半径,验证了新混凝土材料模型及其参数的可靠性。数值模拟结果与试验结果对比表明:该文二次开发的基于拉伸损伤的混凝土动态本构模型计算结果与试验结果吻合良好;基于拉伸损伤的混凝土失效方法可以描述开坑区、隧道区和崩落区,且开坑半径、崩落区半径以及弹体余速与试验误差均不超过13.3%;该文新混凝土材料模型可以模拟靶背自由面影响下的弹体过载拖曳现象;考虑拉伸损伤的混凝土动态本构在贯穿有限厚度混凝土靶体数值模拟中,对混凝土破坏和弹体过载计算具有更明显的精确度。新混凝土材料模型为研究混凝土材料的动态响应提供了新的研究手段。To obtain the concrete dynamic-response while kinetic-energy projectile(KEP)penetrating concrete targets,a new dynamic constitutive-model considering tensile damage was used combined with the HJC state equation to establish concrete material model.Based on the experimental data,the numerical simulation of KEP penetrating concrete targets with different thicknesses was carried out.The new constitutive model was implemented through the LS-DYNA user-defined constitutive development interface,and the crack distribution during the penetration process was characterized by the maximum principle tensile strain based on tensile failure damage.The new concrete constitutive-model along with the corresponding parameters was validated by comparing the numerical simulation results of projectile penetrating concrete targets and the test data in terms of projectile deceleration,residual velocity and target catering and scabbing area size,respectively.The results show that the calculation results of the developed constitutive model are in good agreement with the test data.The concrete failure model based on tensile damage is capable to describe catering zone,tunel zone and spalling zone.Compared with the test data,the error in the calculation of the crater and spalling radius of concrete slab after penetration and projectile residual-velocity do not exceed 13.3%.The new concrete-material-model in this paper can simulate the dragging phenomenon of projectile deceleration under the influence of target back surface.The concrete constitutive considering tensile damage using the simulation of concrete target slab is more accurate in the concrete damage zone and the projectile deceleration.The proposed concrete model provides a new reliable method to study concrete response under dynamic loading.

关 键 词：动能弹 混凝土 贯穿 拉伸损伤 

分 类 号：TJ303.4[兵器科学与技术—火炮、自动武器与弹药工程]