Authors : Hassan Bagheri, Aman Allah Shabankareh and Mohammad Safi
Abstract: Underwater explosion is one of the most destructive phenomena in offshore and coastal structures. Therefore, any country connected to free waters requires foresight regarding retrofit of offshore ship and structures. Although, designing a structure based on explosive loads is not affordable, investigating the waves caused by explosion and their destructive effects could take into account some considerations in locating and constructing of these structures, so that, the minimum destruction would occur. Given the necessity of this issue and what mentioned above, the results of evaluating dynamic behavior of honeycomb sandwich structures under underwater explosion can be examined using finite element method and simulating the explosion environment. In this regard, this study has modeled and monitored 5 samples of honeycomb structures with different cores by simulating them to evaluate the dynamic behavior in underwater explosion condition using explicit dynamic. The results indicated that ductility against underwater explosive load depends on the structure core for honeycomb sandwich structures and this is frequently shown in figures, deformations and contours. Also, the results indicated that a honeycomb structure with diagonal and discrete core has the minimum and maximum deflection equal to 6.2 and 19 cm, respectively. Other samples including square, circular and hexagonal core has 41, 20 and 23% less deformation than the discrete sample. In other words, diagonal sandwich structures are more resistant against the waves caused by underwater explosion and show a more optimal behavior.
Hassan Bagheri, Aman Allah Shabankareh and Mohammad Safi, 2017. Investigating the Effect of Underwater Explosion on Sandwich Structures. Journal of Engineering and Applied Sciences, 12: 8547-8559.