Analysis of internal explosion and structural response to blast loading

Turcan, Uğur Can
In this thesis, blast overpressure due to internal explosion and dynamic response to this loading of the structure is analyzed. Firstly, theoretical backgrounds of computational procedures are presented. The basic principles of the hydrocodes and semi empirical methods are explained in detail. In the analysis of blast overpressure, partially vented structures are examined. Three different venting areas and three different charge weights are employed in the study. Peak pressure, time and impulse parameters are investigated in detail. Remapping and scaling laws are employed in order to reduce the computational cost. Experiments are carried out with similar conditions where pressure histories are recorded. Results from a semi empirical program and a commercial hydrocode are compared with the experimental data. After investigating the accuracy of blast calculation methods, dynamic response to blast loading is reviewed. For this purpose, two methods are used: The fully coupled method in hydrocode and the hybrid method - uniquely coupled semi empirical program and hydrocode. In the fully coupled method, hydrocode solves both blast and response; whilst in the hybrid method, hydrocode is used as the structural solver and semi empirical program is employed for the blast calculation. A deformable test setup is used to observe the response. Results from computational methods are compared with the experimental data. Finally, it can be concluded that semi empirical program and hydrocode are applicable to blast overpressure problems with partial venting. In addition, the methods introduced in dynamic response section can be used as preliminary analysis tools in the prediction of structural response to blast loading. Also, it is shown that the hybrid method is much faster than the fully coupled method in hydrocode.


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In this paper, the seismic response of base-isolated liquid storage tanks subjected to real and simulated near-fault ground motions is investigated. It is assumed that the tanks are seismically isolated by single surface Concave Sliding Bearings (CSB) with different isolation periods. For the input data, the recorded and simulated ground motions having pulse type characters and their dominant waveforms are considered.
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We calculate the Raman frequencies of the E-g mode and, the low and high frequency T-g mode as a function of temperature at a constant pressure of 2.85 kbar in the alpha-phase of solid nitrogen. The Raman frequencies of those lattice modes are calculated using the volume data from the literature at various temperatures (2.85 kbar) for the alpha-phase of solid N-2 through the mode Gruneisen parameter. Our predicted Raman frequencies can be compared with the experimental data and by this method the Raman freq...
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Yurtseven, Hasan Hamit; Kiraci, A. (World Scientific Pub Co Pte Lt, 2011-06-20)
The temperature dependence of the damping constant is calculated for various Raman modes in (NH4)(2)SO4 by the expressions derived from the soft mode hard mode coupling model and the energy fluctuation model. The expressions for the damping constant are fitted to the measured Raman bandwidths and then the activation energies are extracted, which are equal to similar to 0.2 eV for the Raman modes studied. The damping constant of a soft mode is also calculated and the activation energy (similar to 0.1 eV) is ...
Citation Formats
U. C. Turcan, “Analysis of internal explosion and structural response to blast loading,” M.S. - Master of Science, Middle East Technical University, 2012.