Penetration modeling of ultra‐high performance concrete using multiscale meshfree methods

Summary Terminal ballistics of concrete is of extreme importance to the military and civil communities. Over the past few decades, ultra‐high performance concrete (UHPC) has been developed for various applications in the design of protective structures because UHPC has an enhanced ballistic resistan...

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Bibliographic Details
Published in:International journal for numerical and analytical methods in geomechanics 2019-10, Vol.43 (14), p.2328-2351
Main Authors: Sparks, Paul A., Sherburn, Jesse A., Heard, William F., Williams, Brett A.
Format: Article
Language:English
Subjects:
Ballistics
Computed tomography
Concrete
constitutive modeling
Curves
Damage
Damage assessment
Deformation
Equivalence
Evolution
Finite element method
Fracture toughness
Impact analysis
Mathematical models
Meshless methods
Microcracks
Model accuracy
Modelling
Multiscale analysis
multiscale modeling
Nondestructive testing
Nonlinear analysis
Numerical models
Numerical prediction
Partial differential equations
Penetration
penetration modeling
Performance enhancement
Plastic deformation
Projectiles
reproducing kernel particle method
Scaling
Scaling laws
Terminal ballistics
Tomography
Ultra high performance concrete
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Summary:Summary Terminal ballistics of concrete is of extreme importance to the military and civil communities. Over the past few decades, ultra‐high performance concrete (UHPC) has been developed for various applications in the design of protective structures because UHPC has an enhanced ballistic resistance over conventional strength concrete. Developing predictive numerical models of UHPC subjected to penetration is critical in understanding the material's enhanced performance. This study employs the advanced fundamental concrete (AFC) model, and it will run inside the reproducing kernel particle method (RKPM)‐based code known as the nonlinear meshfree analysis program (NMAP). NMAP is advantageous for modeling impact and penetration problems that exhibit extreme deformation and material fragmentation. A comprehensive experimental study was conducted to characterize the UHPC. The investigation consisted of fracture toughness testing, the utilization of nondestructive microcomputed tomography analysis, and lastly projectile penetration shots on the UHPC targets. To improve the accuracy of the model, a new scaled damage evolution law (SDEL) is employed within the microcrack informed damage model. During the homogenized macroscopic calculation, the corresponding microscopic cell needs to be dimensionally equivalent to the mesh dimension when the partial differential equation becomes ill posed and strain softening ensues. To ensure arbitrary mesh geometry for which the homogenized stress‐strain curves are derived, a size scaling law is incorporated into the homogenized tensile damage evolution law. This ensures energy‐bridging equivalence of the microscopic cell to the homogenized medium irrespective of arbitrary mesh geometry. Results of numerical investigations will be compared with results of penetration experiments.
ISSN:0363-9061
1096-9853
DOI:10.1002/nag.2983