A Multiscale Mesh-Free Approach to Modeling Damage of an Ultra-High-Performance Concrete

Sherburn, Jesse A.; Heard, William F.; Williams, Brett A.; Sparks, Paul A.

doi:10.1615/intjmultcompeng.2018025518

Cited by 2 publications

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“…The experiments consisted of hydrostatic compression, triaxial compression, unconfined direct pull, and uniaxial load/constant volume tests. The quasi static results were documented by Williams et al 43 and the dynamic unconfined compressive strength, and the resulting dynamic increase factor, were characterized by Martin et al 44 The UHPC fracture energy was obtained by Sherburn et al 45 using the three-point notched beam test developed by Hillerborg et al 46 A mode I crack initiated at the notch and propagated through the beam, and the resulting fracture energy was determined from the crack tip opening displacement (CTOD). From the physical test, macroscale constitutive parameters, ie, elastic modulus, Poisson's ratio, peak tensile strength, and fracture energy, were identified and documented for use during the numerical validation study.…”

Section: Microcell Analysismentioning

confidence: 99%

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

Sparks¹,

Sherburn²,

Heard³

et al. 2021

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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 runs 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 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. Results of numerical investigations will be compared with results of penetration experiments.

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Section: Microcell Analysismentioning

confidence: 99%

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

Sparks¹,

Sherburn²,

Heard³

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The experiments consisted of hydrostatic compression, triaxial compression, unconfined direct pull, and uniaxial load/constant volume tests. The quasi static results were documented by Williams et al and the dynamic unconfined compressive strength, and the resulting dynamic increase factor, were characterized by Martin et al The UHPC fracture energy was obtained by Sherburn et al using the three‐point notched beam test developed by Hillerborg et al A mode I crack initiated at the notch and propagated through the beam, and the resulting fracture energy was determined from the crack tip opening displacement (CTOD). From the physical test, macroscale constitutive parameters, ie, elastic modulus, Poisson's ratio, peak tensile strength, and fracture energy, were identified and documented for use during the numerical validation study.…”

Section: Validation Studymentioning

confidence: 99%

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

Sparks

Sherburn

Heard

et al. 2019

Num Anal Meth Geomechanics

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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.

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A Multiscale Mesh-Free Approach to Modeling Damage of an Ultra-High-Performance Concrete

Cited by 2 publications

References 0 publications

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

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

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

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