Experimental fatigue crack growth analysis of the aircraft structural component subjected to different cycling loading has been presented. The purpose of the experimental test was to evaluates the fatigue behavior of the real aircraft spar, made in aluminum 2024-T3. In-house laboratory fatigue test installation is described in the paper. The spar-test specimen has been manufactured specifically for the cycling damage testing. Test results were obtained with most modern equipment for data acquisition. Applied loads and obtained spar fatigue results are described in detail. Conclusions have been made with reference to the previous work on the duraluminum spar fatigue testing. As it is presented in the previous work with advanced numerical methods for fatigue analysis, in this paper is given an opinion on the same. At the end, possible directions of the further experimental spar fatigue testing is given and shows us that it makes sense to make the comparison beetwen real and numerical results only in situations where cracks behave similarly and the numbers of required cycles are about the same.
Development of elements for absorption of collision energy of railway vehicles represent an important segment in the design of new and restoration of existing railway passenger coaches. Absorption elements are part of passive protection measures used railway vehicles. Passive protection role is achieved when crash repercussions during impact are minimized. In this article, the analysis of the characteristics of modified tube absorbers for kinetic collision energy of passenger coaches is performed. The research focuses on quasi‐static tests and dynamic tests. The presented solution is based on the use of steel tube elements that absorb a certain amount of collision energy of passenger coaches by controlled plastic deformation. The modified tube absorber is installed in a row with a standard buffer for passenger coaches. Given the results obtained, a final evaluation of this type of absorber is done. In addition, proposal for further research is offered with the goal to increase the safety level in railway traffic.
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