Impact Response Study on Covering Cap of Aircraft Big-Size Integral Fuel Tank
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Impact Response Study on Covering Cap of Aircraft Big-Size Integral Fuel Tank Fusheng Wang 1 & Senqing Jia 1 & Yi Wang 1 & Zhufeng Yue 1
Received: 12 April 2016 / Accepted: 10 May 2016 / Published online: 18 May 2016 # Springer Science+Business Media Dordrecht 2016
Abstract In order to assess various design concepts and choose a kind of covering cap design scheme which can meet the requirements of airworthiness standard and ensure the safety of fuel tank. Using finite element software ANSYS/LS- DYNA, the impact process of covering cap of aircraft fuel tank by projectile were simulated, in which dynamical characteristics of simple single covering cap and gland double-layer covering cap impacted by titanium alloy projectile and rubber projectile were studied, as well as factor effects on simple single covering cap and gland double-layer covering cap under impact region, impact angle and impact energy were also studied. Though the comparison of critical damage velocity and element deleted number of the covering caps, it shows that the external covering cap has a good protection effect on internal covering cap. The regions close to boundary are vulnerable to appear impact damage with titanium alloy projectile while the regions close to center is vulnerable to occur damage with rubber projectile. Equivalent strain in covering cap is very little when impact angle is less than 15°. Element deleted number in covering cap reaches the maximum when impact angle is between 60°and 65°by titanium alloy projectile. While the bigger the impact angle and the more serious damage of the covering cap will be when rubber projectile impact composite covering cap. The energy needed for occurring damage on external covering cap and internal covering cap is less than and higher than that when single covering cap occur damage, respectively. The energy needed for complete breakdown of double-layer covering cap is much higher than that of single covering cap. Keywords Aircraft fuel tank . Covering cap . Composite material . Impact position . Impact angle . Impact energy
* Fusheng Wang [email protected]
1
School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi’an 710129, People’s Republic of China
954
Appl Compos Mater (2016) 23:953–972
1 Introduction Advanced composite materials have been widely used in the primary airframe structures for their excellent mechanical properties and low specific weight. But poor properties through thickness make it particularly sensitive to low energy impact [1]. Wing-mounted engines are widely used in current civil aircraft and the overall fuel tank is generally located within the wing structure. There are several maintenance covering caps located at the bottom of the wing in order to meet the requirements of installation and maintenance of the wing. The aircraft fuel tank is difficult to avoid damage by small stones and rubber fragments lofting off the runway in the process of taking off and landing, some severe cases may cause dangerous situation such as wall
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