The main function of aircraft ejection system is that it separates the store from the aircraft. The ejection force is important for the safety of the aircraft when the store is ejected, because the store can be lifted by air flow affected by the aircraft’s speed. If the ejection force is low, the aircraft can be damaged by the floating store. The ejection force of the suspension system should be designed in order to release the store safely. In this study, the ejection force of the pyrotechnic suspension using the cartridge to eject the store was researched. This research was performed, based on the precedent study about the over-center linkage mechanism and the pressure drop by the orifice. The ejection force was calculated, after analyzing mathematical fundamentals about the pressure in the system of the suspension and analyzed through AutoDyn and ADAMS software. Finally, the theoretical results were compared with the ejection test results of the suspension system.

In this paper, the DSC and TGA for phenol and silica/phenolic composite were carried out by increasing temperature up to 950℃ with variable heating rate, to figure out basic thermal and pyrolysis characteristics of the composite. Also, the aim was to obtain the activation energy and the frequency factor which are the main parameters of the Arrhenius equation based on the Kissinger theory. The activation energy and frequency factor were used for the ablation model as material property. To confirm surface temperature distribution and recession of missiles, the CFD analysis using ANSYS Fluent R18.2 was performed to examine the thermal fluid characteristics of the hypersonic flight environment. Subsequently, the analysis results were applied as boundary conditions to a 2D axisymmetric pyrolysis and ablation model. Finally, pyrolysis and ablation analysis were performed using the ablation analysis code SAMCEF AMARYLLIS V.17, which uses the specific ablation module based on finite element code by applying carbon/phenolic and cork materials up to t = 10 s.

This paper addresses two methods to estimate the target incapacitation distance and probability of the arbitrary fragmentation warhead under the static detonation test condition. One is based on the probability equation suggested by Sperrazza and Kokinakis. The other is originated from the stationary detonation test concept to measure the performance of the fragmentation warhead. In the arbitrary fragmentation warhead, the target incapacitation probabilities obtained from the two methods were compared with each other. We found that the size of the fragment with cubic shape should be more than 3.5 mm to maximize the target incapacitation distance in the test method. And we also realized that the difference between the target incapacitation distance of the analysis method based on the test (AMBT) and that of the analysis method based on the probability equation (AMBPE) is decreased according to the increase of the fragment size. In conclusion, this paper can be useful for the estimation of the fragmentation warhead performance at the design stage.