Ballistic perforation resistance of thin concrete slabs impacted by ogive-nose steel projectiles

Kristoffersen, Martin; Toreskås, Oda Lunde; Dey, Sumita

doi:10.1016/j.ijimpeng.2021.103957

Cited by 22 publications

(26 citation statements)

References 48 publications

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“…Hanchak et al (1992) found that tripling the unconfined compressive strength resulted in a very modest increase in perforation resistance for 178 mm thick slabs impacted by 25.4 mm diameter ogive-nose projectiles. Similar results have since been replicated (Børvik et al, 2007), and recent experimental and numerical studies show that f c alone has limited influence on the ballistic perforation resistance of thin concrete slabs (Kristoffersen et al, 2021b). This study is thus limited to ballistic impact against concrete slabs with a finite thickness where the unconfined compressive strength is one of several governing parameters.…”

Section: Introductionsupporting

confidence: 57%

Evaluation of automatic versus material test-based calibrations of concrete models for ballistic impact simulations

Antoniou

Kristoffersen

2023

International Journal of Protective Structures

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Concrete is used for protective structures all over the world. Accurate response estimates to a given threat is vital for designing such structures. Concrete models often require numerous input parameters for which sufficient experimental data can be challenging to obtain. Some models are accompanied by parameter generators which use the unconfined compression strength to extrapolate the remainder of the parameters based on experimental databases. This study investigates simulation of ballistic impact on high-strength concrete with 75 MPa nominal unconfined cylindrical compressive strength. The first objective is to investigate the accuracy parameter generators to produce input data for commonly used concrete material models. The second objective is to establish and evaluate a simplified parameter calibration procedure based on standard material experiments and data from the literature. The results employing parameter generators varied notably between the models while still giving decent ballpark estimates. The parameters obtained from inverse modelling of standardized material tests improved the results significantly. The findings of this study recommend caution when using automatic parameter generators. Although a detailed calibration of these concrete models is complicated, a simplified calibration gives reasonable predictions, making this the advisable approach for designing concrete protective structures.

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Section: Introductionsupporting

confidence: 57%

Evaluation of automatic versus material test-based calibrations of concrete models for ballistic impact simulations

Antoniou

Kristoffersen

2023

International Journal of Protective Structures

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“…The corresponding finite element model, including the target and the projectile, is shown in Figure 5. A friction coefficient for the interactions between the concrete and steel projectile is difficult to determine experimentally; however, other researchers have shown negligible differences in the choice of friction coefficient in finite element ballistic impact simulations (Kristoffersen et al, 2021). Therefore, a general contact algorithm defines the contact between the projectile and the target with a friction coefficient of 0.2 defined.…”

Section: Finite Element Ballistic Impact Simulationsmentioning

confidence: 99%

Assessment of the ballistic impact response of Cor-Tuf UHPC concrete using the HJC constitutive model

Perkins

Duncan

Johnson

et al. 2023

International Journal of Protective Structures

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Concrete offers superior strength in compressive loadings and is implemented for many applications. The high compressive strengths enable concrete to resist high strain rate loading scenarios such as ballistic impacts. A variety of concrete denoted as Cor-Tuf, which is classified as ultra-high-performance concrete with a compressive strength of 210 MPa, is evaluated in this study. The response of this concrete is assessed through a finite element analysis under the high strain rate loadings of ballistic impacts. To capture the response of the concrete, a plasticity and damage constitutive model denoted as the HJC model is implemented. The parameters of this model are calibrated to the Cor-Tuf concrete using confined compression experiments, unconfined compression experiments, and shock experiments. The concrete target is impacted at speeds between 610 m/s through 1112 m/s, and the results are compared to existing experimental data. Our results show that the HJC model can predict the response of this impact to the Cor-Tuf concrete targets as an average error of 5.85% is found. The results of this study present parameters which can be implemented with the HJC concrete model for future studies to model the response of the Cor-Tuf UHPC.

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“…Furthermore, when the structure is subjected to a projectile impact, separation events such as the fragmentation of the concrete matrix are inevitable, adding to the difficulty of describing such structural behaviors precisely. Many different numerical approaches have been utilized to trace the structural responses with the progress of a projectile across the depth, and the finite element method (FEM) based on a Lagrangian element has been commonly used in the impact analyses of concrete structures (Goda and Girardot, 2021; Kristoffersen et al., 2021; Lee et al., 2022; Sun and Xu, 2022; Zhang et al., 2021), as the FEM provides not only high accuracy in the numerical results but also efficiency in the computational cost. However, it is also true that the FEM may cause distortions of elements in large deformation problems related to severe explosion or impact loadings (Wu et al., 2016).…”

Section: Introductionmentioning

confidence: 99%

Impact simulations for high-performance fiber-reinforced cement composites using a coupled finite element and smoothed particle Galerkin method

Lee

Kwak

2022

International Journal of Damage Mechanics

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This paper presents a projectile impact analysis of high-performance fiber-reinforced cement composite (HPFRCC) structures based on the coupling of the finite element method (FEM) and the smoothed particle Galerkin (SPG) model in the LS-DYNA program. The K&C material model is calibrated for the HPFRCC. Through a quasi-static analysis using the calibrated model, the criteria for the element size of a FEM and the nodal particle distance of the SPG model are determined. Numerical simulations of the coupled SPG-FEM model are conducted to predict the structural responses of HPFRCC structures subjected to high impact velocities ranging from 342 m/s to 808 m/s. The results for the coupled model are compared with experimental data as well as numerical results for a pure FEM model to determine the relative accuracy and efficiency of a coupled FEM and SPG model for the large deformation problem. The convergence of the numerical results is also investigated in terms of the residual velocity and penetration depth. Moreover, the effects of various parameters on the models are discussed through a sensitivity analysis, and suitable parameter ranges that improve the accuracy of the numerical results are suggested.

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Ballistic perforation resistance of thin concrete slabs impacted by ogive-nose steel projectiles

Cited by 22 publications

References 48 publications

Evaluation of automatic versus material test-based calibrations of concrete models for ballistic impact simulations

Evaluation of automatic versus material test-based calibrations of concrete models for ballistic impact simulations

Assessment of the ballistic impact response of Cor-Tuf UHPC concrete using the HJC constitutive model

Impact simulations for high-performance fiber-reinforced cement composites using a coupled finite element and smoothed particle Galerkin method

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