Experimental testing of the fracture of concrete and reinforced concrete plates under impact

Konyaev, A. A.; Tolkachev, V. F.; Platova, T. M.

doi:10.1134/s0021894415060139

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…Forrestal's Formula of Penetration Depth. On the basis of cavity-expansion analyses, an empirical equation to predict the penetration depth of concrete targets was proposed [9]. In this model, the retarding stress on the projectile nose is expressed as…”

Section: Formulas Of Penetration Depth Predictionmentioning

confidence: 99%

“…Finite Element Model. In the present study, one group of the experiments in [9] is referenced for the simulations. e 23 MPa cylindrical concrete target with a standard deviation of 2.4 MPa had a diameter and length of 1.83 m. Ogive-nosed projectiles with CRH � 3 were machined from 4340 Rc45 steel.…”

Section: Numerical Simulations and Validationmentioning

confidence: 99%

“…To make a more accurate prediction of penetration depths of concrete targets is of great importance in the underground defensive project. Penetration is a process with large strain, high strain rate, and high pressure, in which the dynamic responses of both the projectile and target are very complicated [9], especially for concrete targets that exhibit complicated nonlinear behavior under dynamic loadings [10]. In addition, the effects of strain rate and crack propagation on the mechanical properties of concrete have not been clearly described due to its brittle properties, which play important roles in the penetration process.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study on the Entrance Effect of Penetration into Concrete Targets

Yang

Luo

Zhang

et al. 2021

Mathematical Problems in Engineering

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Investigation on penetration into concrete targets is of great importance as concrete is widely used as the fundamental construction material. To achieve a more accurate prediction of penetration depths of concrete targets, a further study was conducted to explore the entrance effect by using AUTODYN hydrocode in this study. The numerical results on both deceleration-time history and depth of penetration of projectiles are in good agreement with experimental data, which demonstrate the feasibility of the numerical model in these conditions. A new target model was established with a predrilled hole around the symmetry axis to simulate the entrance effect of the crater phase on the penetration process. Compared with the regular target, the predrilled target enters the peak of acceleration earlier, leading to the reduction of the depth of penetration. In addition, simulation results indicated that nose shape significantly influenced crater region depth, while the depth was independent of the impact velocity and the target strength. Based on the simulation of entrance effect, a modified formula of penetration depth has been proposed and validated in terms of different nose shapes. The crater region depths obtained from the simulations can improve the accuracy of the predictions of the penetration depths for the penetration of concrete targets.

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Section: Formulas Of Penetration Depth Predictionmentioning

confidence: 99%

Section: Numerical Simulations and Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Study on the Entrance Effect of Penetration into Concrete Targets

Yang

Luo

Zhang

et al. 2021

Mathematical Problems in Engineering

View full text Add to dashboard Cite

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“…At present, a large number of experts and scholars have carried out various types of penetration tests on concrete, and the concrete model parameters in the simulation are compared [5]. In reference [2], the experiment and numerical simulation of missile penetration into the reinforced concrete target plate are compared, and the simulation model can well describe the damage mechanism of the structure, and it also introduced the calculation method of low strength concrete penetration depth, and the calculation formula of the residual velocity was also introduced [6]. Te damage characteristics of projectiles with diferent head shapes penetrating the concrete are studied, and the relationship between the back damage of the target plate and the shape of the warhead is analyzed [7].…”

Section: Introductionmentioning

confidence: 99%

Study on Joint Damage of Double Prefabricated Fragments Penetrating Finite Thickness Concrete

Wang

Yang

Yin

et al. 2023

Shock and Vibration

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In order to study the joint damage mechanism of multiple prefabricated fragments to finite thickness concrete targets, experiments on the damaging effect of a single fragment on a 300 × 300 × 100 mm concrete target were carried out, and the reliability of the simulation calculation model of single fragment damage to concrete was verified. On this basis, according to the trajectory of two fragments penetrating concrete, the double fragment penetration is divided into two penetration situations, that is, coplanar and heterogeneous. The orthogonal optimization method is used to carry out the joint damage simulation calculation of the double fragments to the concrete target by changing the fragment velocity, penetration angle, fragment spacing, and other factors. The simulation results show that the relationship between joint damage and fragment spacing is the largest when the fragment trajectories are coplanar, and the partial least squares regression coefficients affecting the joint damage time and surface joint length are 0.70 and 0.68 respectively. When the trajectory is different, the joint damage mode is relatively complex. Based on this, the joint damage degree analysis method between fragments is established, and each variable can explain 73.8% of the joint damage degree. It is found that the joint damage of the front pit area is the largest when the fragment is in different planes, and the PLS regression coefficient is −0.44. The hypothesis that joint damage is easy to occur in the area of the intersection line on the back of the target is analyzed and verified.

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