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
In this work, the analysis of the impactor mass effect on the behaviour of carbon/epoxy woven laminates under low velocity impact is carried out. To this end experimental test were performed by means of a drop weigh tower in a range of energies varying from 10 to 110 J, and using three different impactor masses. Two different laminate thicknesses were considered in order to take into account its possible influence. An analysis of the impact tests is performed using the Composite Structure Impact Performance Assessment Program, in order to observe the influence of impactor mass. Once impacted, the laminates were inspected by means of a C Scan (to quantify the delamination extension) and a phased array ultrasonic system (to analyse the failure through the thickness); this non destructive anal ysis will determine the influence of the impactor mass on the laminate failure.
In this work a numerical methodology to predict the behavior of composite unidirectional laminates under high velocity impact is developed. In order to validate the model, experimental results of high velocity impacts of steel sphere against laminate coupons, were accomplished. The residual velocity in case of penetration and the damaged area in the panel are the variables chosen to validate the results obtained in the numerical methodology proposed. Finally an analysis of the influence of the projectile geometry is accomplished.
A numerical model is developed to analyse the influence of the shape of a high-explosive on the dynamics of the generated pressure wave. A Multi-Material Arbitrary Lagrangian Eulerian (MM-ALE) technique is used as the CONWEP approach is not adequate to model such situations. Validation and verification of the proposed numerical model is achieved based on experimental data obtained from the bibliography. The numerical model provides relevant information that cannot be obtained from the experimental results. The influence of the mass and shape of the high-explosive is studied and correlated to the dynamics of the generated blast wave through the analysis of peak pressures, time of arrival and impulse. Tests are done with constant mass hemispherical, cylindrical and flat-shaped Formex F4HV samples. A detailed analysis of the generated blast wave is done, along with a thorough comparison between incident and reflected waves. It is concluded that the dynamic effects of the reflected pressure pulses should always be considered in structural design, most relevantly when analysing closed structures where the number of reflections can be significant. The model is proved reliable, concluding that the frontal area of the high-explosive is a determinant driving parameter for the impulse generated by the blast.
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