a b s t r a c tHydrodynamic ram (HRAM) is a phenomenon that occurs when a high energy object penetrates a fluid filled container. The projectile transfers its momentum and kinetic energy through the fluid to the surrounding structure increasing the risk of catastrophic failure and excessive structural damage. It is of particular concern in the design of wing fuel tanks for aircraft since it has been identified as one of the important factors in aircraft vulnerability. For the present work, water filled aluminium square tubes (6063 T5) were subjected to impact by steel spherical projectiles (12.5 mm diameter) at impact velocities of 600 900 m/s. The aluminium tubes were filled at different volumes to study how an air layer inside the tank might influence the impact behaviour. The test boxes were instrumented with five strain gauges and two pressure transducers. The formation process of the cavity was recorded with a high speed camera. This work presents the results of these tests.
a b s t r a c tHydrodynamic ram (HRAM) is a phenomenon that occurs when a high kinetic energy object penetrates a fluid filled container. The projectile transfers its momentum and kinetic energy through the fluid to the surrounding structure, increasing the risk of catastrophic failure and excessive structural damage. This is of particular concern in the design of wing fuel tanks for aircraft since it has been identified as one of the important factors in aircraft vulnerability. In the present paper, the commercial finite element code LS DYNA has been used to simulate an HRAM event created by a steel spherical projectile impacting a water filled aluminium square tube. Two different formulations (ALE and SPH) are employed to reproduce the event. Experimental tests which indicate the pressure at different points of the fluid, displacement of the walls and cavity evolution for different impact velocities are compared with the numerical results in order to assess the validity and accuracy of both ALE and SPH techniques in reproducing such a complex phenomenon.
P e r n a s -S á n c h e z , J . ; A r t e r o -G u e r r e r o , J . A . ; V a r a s , D . ; L ó p e z -P u e n t e , J . ( 2 0 1 5 ) . "A n a l y s i s o f I c e Im p a c t P r o c e s s a t H i g h V e l o c i t y " . E x p e r im e n t a l M e c h a n i c s , v . 5 5 , I s s u e 9 , J u l y , p p . 1 6 6 9 -1 6 7 9 . DO I : 1 0 . 1 0 0 7 / s 1 1 3 4 0 -0 1 5 -0 0 6 7 -4 © S o c i e t y f o r E x p e r im e n t a l M e c h a n i c s 2 0 1 5 P r o y e c t o D P I 2 0 1 3 -4 1 0 9 4 -R A n a l y s i s o f I c e Im p a c t P r o c e s s a t H ig h V e l o c i t y J . P e r n a s -S á n c h e z 1 · J .A . A r t e r o -G u e r r e r o 1 · D . V a r a s 1 · J . L ó p e z -P u e n t e 1 A b s t r a c t: I n t h i s w o r k t h e h i g h v e l o c i t y im p a c t o f i c e s p h e r e s i s a n a l y s e d . A n e x p e r im e n t a l m e t h o d o l o g y h a s b e e n d e v e l o p e d i n o r d e r t o l a u n c h , a t h i g h v e l o c i t y , i c e s p h e r e s o f d i f f e r e n t d i am e t e r s a g a i n s t a l o a d c e l l t o m e a s u r e t h e f o r c e i n d u c e d d u r i n g t h e im p a c t . A n a n a l y s i s o f t h e i n f l u -e n c e o f t h e i c e m a s s o n t h e im p a c t f o r c e i s a c c om p l i s h e d u s i n g t h e c o n t a c t f o r c e w h i c h w a s c a l c u l a t e d b y m e a n s o f a n i n v e r s e p r o b l em t e c h n i q u e . F i n a l l y a s t u d y o f t h e im p a c t p h e n om e n o n h a s b e e n p e r f o rm e d u s i n g t h e v i d e o s o b t a i n e d w i t h a h i g h s p e e dc am e r a . K ey wo r d s : I c e b e h a v i o u r ; H i g h v e l o c i t y im p a c t ; H ig h s t r a i n r a t e ; E x p e r im e n t a l ; C o n t a c t f o r c e I n t r o d u c t i o n D u r i n g i t s s e r v i c e l i f e , a i r c r a f t s t r u c t u r e s c o u l d b e s u b j e c t e d t o d i f f e r e n t k i n d o f l o a d s . F o c u s i n g o n im p a c t l o a d s , i t i s T h i s r e s e a r c h w a s d o n e w i t h t h e f i n a n c i a l s u p p o r t o f t h e S p a n i s h M i n i s t r y o f E d u c a t i o n u n d e r P r o j e c t r e f e r e n c e D P I 2 0 1 3 -4 1 0 9 4 -R .J . Ĺ o p e z -P u e n t e j l p u e n t e@ i n g . u c 3m . e s J . P e r n a s -Ś a n c h e z j p e r n a s@ i n g . u c 3m . e s J .A . A r t e r o -G u e r r e r o j a r t e r o@ i n g . u c 3m . e s D . V a r a s d v a r a s@ i n g . u c 3m . e s
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