Small‐scale plate tests with fine concrete in experiment and first simplified simulation

Abstract

In the following article impact experiments from experimental and numerical point of view will be described. In order to keep the number of parameters to be varied manageable, the focus was firstly on similar plain concrete plates. The experiments were carried out with the aim to collect reference values and to simulate these experiments as basis for further investigations. The only parameter that has been changed was the impact velocity. The experimental part of the publication deals with manufacturing of the specimens, the experimental setup, the execution of the experiments, the measured values, and a brief evaluation of the results. The numerical part of the publication deals with the computation of experimental results using the simulation program LS-Dyna. In this context, it will be explained how the model was created and which boundary conditions and material models were used. Furthermore, the calibration of the materiel law is described. Subsequently, a comparison between the experimental and simulated results is carried out. The focus of the further investigations will be the consideration of concrete layers reinforced with textiles under impact load. The work presented here deals with the matrix material of the textile reinforced concrete and thus laid the foundation for these investigations.

Modelling of High Velocity Impact on Concrete Structures Using a Rate-Dependent Plastic-Damage Microplane Approach at Finite Strains

“…Second example deals with a square small thin plate subjected to high velocity impact loading based on experiments by [ 48 ] with dimension of 610 × 610 × 30 mm. A steel impactor with a diameter of 100 mm and a height of 100 m installed in a steel frame hits the concrete plate by an initial velocity of 12,300 mm/s.…”

“…To investigate the difference between small and finite strain simulations, the impact test is performed using three different velocities, i.e., 12.3 m/s, 16.5 m/s, and 20.3 m/s. First investigation is the velocity-time relation for both models compared to the experimental data in [ 48 ], see Figure 25 . At the lower velocity, m/s, coinciding curves of small and finite strain results are observed.…”

“…Second investigation deals with the crack pattern for the small and the finite strain model compared to the experimental data as reported in [ 48 ], see Figure 26 and Figure 27 for the top and bottom side view of the plate, respectively. As can be seen in Figure 26 a and Figure 27 a, almost similar results between the small and finite strain simulations are identified at the lower impact velocity of 12.3 m/s.…”

“… Bottom view of thin plate impact test for experiments in [ 48 ] comparing small and finite strain simulations at three different velocities: ( a ) 12.3 m/s, ( b ) 16.5 m/s, and ( c ) 20.3 m/s. …”

“… Damaged plate due to impact tests reported in [ 48 ] compared to small and finite strain simulations at the velocity of 12.3 m/s: ( a ) top view and ( b ) bottom view. …”