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Perforation studies of concrete panel under high velocity projectile impact based on an improved dynamic constitutive model

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Defence Technology(防务技术) 2023年第9期27卷 64-82页

作者： Fei Zhou Hao Wu Yuehua Cheng Department of Disaster Mitigation for Structures College of Civil EngineeringTongji UniversityShanghai200092China

The finite-depth concrete panels have been widely applied in the protective structures,and its impact resistance and dynamic fracture failures,especially the scabbing/perforation limits,under high velocity projectile impact,are mainly concerned by protective engineers,which are numerically studied based on an improved dynamic concrete model in this ***,based on the framework of the KCC(Karagozian&Case concrete)model,a dynamic concrete model is proposed which considers an independent tensile damage model and a continued transition between dynamic tensile and compressive ***,the strength surface,equation of state and damage parameters of the proposed model are comprehensively calibrated by a triaxial compressive test with high confinement pressure,the rationality of which is further verified based on the single element tests,e.g.,uniaxial and triaxial compression as well as uniaxial,biaxial and triaxial ***,a series of projectile high velocity impact tests on thin and thick concrete panels are simulated,which indicates that the projectile residual velocity and dynamic fracture failures are reproduced satisfactorily,while the KCC model underestimates both the spalling and scabbing dimensions ***,based on the validated concrete model and finite element analyses approach,the validations of the existing five empirical formulae are evaluated,in terms of the depth of penetration(DOP)and scabbing/perforation limits of concrete *** the Army corps of engineers(ACE)and modified National Defense Research Committee(NDRC)formulae are recommended in the design of the protective structure to avoid scabbing failure.

关键词： concrete panel Projectile Dynamic fracture Scabbing limit Constitutive model

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Damage modeling of ballistic penetration and impact behavior of concrete panel under low and high velocities

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Defence Technology（防务技术） 2021年第1期17卷 202-211页

作者： Chahmi Oucif J.S.Kalyana Rama K.Shankar Ram Farid Abed Institute of Structural Mechanics(ISM) Bauhaus-Universitat WeimarMarienstraße 15D-99423WeimarGermany Department of Civil Engineering BITS Pilani-Hyderabad CampusHyderabad500072India Department of Civil Engineering Vignana Bharathi Institute of TechnologyHyderabad501301India Department of Civil Engineering University of CaliforniaBerkeleyBerkeleyCAUnited States Department of Civil Engineering American University of SharjahP.O.Box 26666United Arab Emirates

This work presents a numerical simulation of ballistic penetration and high velocity impact behavior of plain and reinforced concrete *** paper is divided into two *** first part consists of numerical modeling of reinforced concrete panel penetrated with a spherical projectile using concrete damage plasticity(CDP)model,while the second part focuses on the comparison of CDP model and Johnson-Holmquist-2(JH-2)damage model and their ability to describe the behavior of concrete panel under impact *** first and second concrete panels have dimensions of 1500 mm1500 mm150 mm and 675 mm675 mm200 mm,respectively,and are meshed using 8-node hexahedron solid *** impact object used in the first part is a spherical projectile of 150 mm diameter,while in the second part steel projectile of a length of 152 mm is modeled as rigid *** and scabbing characteristics are studied in the first *** the second part,the comparison results are presented as damage contours,kinetic energy of projectile and internal energy of the *** results revealed a severe fracture of the panel and high kinetic energy of the projectile using CDP model comparing to the JH-2 *** addition,the internal energy of concrete using CDP model was found to be less comparing to the JH-2 model.

关键词： Johnson-Holmquist-2 concrete damage plasticity concrete panel Damage Impact loads

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