Improved Element Erosion Function for Concrete-Like Materials with the SPH Method

Kala, Jiří; Hušek, Martin

doi:10.1155/2016/4593749

Cited by 35 publications

(13 citation statements)

References 28 publications

(44 reference statements)

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“…The vertical stiffness of the rail pads in relation to the rate of loading is verified experimentally. The static and dynamic stiffness of the rail pads is distinguished by this [6,7].…”

Section: Computation Modelmentioning

confidence: 99%

Dynamical response of railway switches and crossings

et al. 2017

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Abstract.A procedure for the numerical analysis of the dynamic response during the passage of railway vehicles is described. The solution is based on the finite element method (FEM), which is used for the calculation of track stresses. An FEM model was used with a fine structure that included all components of switches and crossings, including movable parts. The excitation forces are defined on the basis of the assumed interaction between track and vehicle. The track stiffness defined by FEM analyses is used for the calculation of dynamic vertical and lateral wheel load. A special model of a railway vehicle was built with the aim of calculating the forces at points where abrupt stiffness changes occur, as well as geometrical imperfections in the frog structure.

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“…The vertical stiffness of the rail pads in relation to the rate of loading is verified experimentally. The static and dynamic stiffness of the rail pads is distinguished by this [6,7].…”

Section: Computation Modelmentioning

confidence: 99%

Dynamical response of railway switches and crossings

et al. 2017

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“…Silling and Askari, and Diehl et al used peridynamics to model a spherical projectile impacting a brittle target with striking velocities between 35 and 200 m/s. Kala and Hušek, and Nordendale et al used smooth particle hydrodynamics (SPH) to model projectile impact of concrete targets with striking velocities of 500 and 1077 m/s, respectively. Chen et al, Chi et al, and Sherburn et al modeled concrete perforation problems utilizing reproducing kernel particle methods (RKPM).…”

Section: Introductionmentioning

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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“…Complex nonlinear material models of concrete implemented in sophisticated computing systems based primarily on the implicit or explicit finite element method [1][2][3] are currently the most powerful tools enabling the modelling of the real nonlinear behaviour of concrete within static and dynamic numerical simulations [4][5][6][7][8][9][10][11]. Such simulations can be focused on the design of safer and more economical protective and military concrete structures.…”

Section: Introductionmentioning

confidence: 99%