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Zaawansowane symulacje numeryczne MES dynamiki mostów z wykorzystaniem procedury explicit

Miśkiewicz Mikołaj, Bruski Dawid, Chróścielewski Jacek, Wilde Krzysztof, Grębowski Karol

Mosty

2019

nr 1

38--41

Dostęp do mocy obliczeniowej super komputerów oraz możliwość wykorzystania nowoczesnych systemów, np. takich jak Ls-Dyna, pozwala na uzyskanie niezwykle szczegółowych rozwiązań bardzo skomplikowanych problemów inżynierskich.

The article presents some remarks on the dynamic simulations of bridges in the Ls-Dyna system. Some results of two dynamic problems are presented. The first example concerns a viaduct that was hit by a vehicle passing under it. The second one relates to the design of a concrete multi-span bridge subjected to earthquakes of various intensity.

Evaluation of Pressure Distribution in Buried Pipes with Liquid in the Explosion

Parviz M., Aminnejad B., Fiouz A. R.

Archives of Civil Engineering

2019

Vol. 65, nr 3

3--14

In this Paper, a parametric study on pipes buried in soil was performed illustrating the results of blast loading. Effects of various parameters such as the physical properties of water, oil, gas, air, soil, pipes, and TNT have been investigated. The arbitrary Lagrangian-Eulerian (ALE) method was employed using LS-DYNA software. The maximum pressure in a buried pipe explosive was observed at an angle of about 0° to 45° and the minimum pressure occurred at an angle of about 45° to 90°. Therefore, all figures in this study illustrate that fluid pressure levels in buried pipes can help in their stabilization. In generally, by increasing the 1.23 times of liquid density under the explosion, the pressure levels in the soil decreased by 1.3 percent. The gas pressure has been increasing more than oil and water pipes 39.73 and 40.52 percent, respectively.

Numerical Simulation of the Air-Bag Inflation Process

Bartkowski P.

Machine Dynamics Research

2016

Vol. 40, No. 4

121--130

The numerical and experimental research of the airbag inflation process are presented in this paper. At the beginning the numerical model prepared for the identification of the basic parameters of the airbag inflator was shown. In the next part of the paper the experimental research performed on the dedicated test stand are presented. At the end the comparison between experimental and numerical results are shown.