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This paper investigates the blast response of a glass fiber reinforced polymer pipeline using explicit finite element analysis. In this study, a fluid-structure interaction methodology was employed to obtain the deformation and damage of pipeline under explosive impact using LS-DYNA. The purpose of this research is to evaluate the influence of the stand-off distance, the tube diameter, the internal pressure of tube and the explosive quantity on dynamic response of composite pipe. Simulations were carried out not only in the case of empty pipe but also in the case of water-filled pipe with different internal pressures. The analysis was performed in two phases; initialization phase, where the pressurization and gravity loads are applied on the pipeline, and the blast phase. Comparing the analysis results, it was proved that the internal pressure influences significantly the deformation of the tube. The results of the present study can serve as a reference guide for the prediction of pipe response under blast loading, since no guidelines exist in pipeline standards for design under blast loading conditions.

Aviation authorities require, from aircraft seat manufacturers, specific performance metrics that maximize the occupants’ chances of survival in the case of an emergency landing and allow for the safe evacuation of the aircraft cabin. Therefore, aircraft seats must comply with specific requirements with respect to their structural integrity and potential occupant injuries, which are certified through the conduction of costly, full-scale tests. To reduce certification costs, computer-aided methods such as finite element analysis can simulate and predict the responses of different seat configuration concepts and potentially save time and development costs. This work presents one of the major steps of an aircraft seat development, which is the design and study of preliminary design concepts, whose structural and biomechanical response will determine whether the concept seat model is approved for the next steps of development. More specifically, a three-occupant aircraft seat configuration is studied for crash landing load cases and is subjected to modification iterations from a baseline design to a composite one for its structural performance, its weight reduction and the reduction of forces transmitted to the passengers.

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