Energy absorption by structural collapse in dual phase steel tubes
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5. M. L. Hohworth and M. R. Louthan, Jr.: Corrosion, 1968, vol. 24, no. 4, pp. 110-24 6. I. Aitclqisonand B. Cox: Corrosion, 1972, vol. 28, no. 3, pp. 83-87. 7. A. J. Bursle and E. N. Pugh: Unpublishedresearch,Univeristyof Illinois at Urbana-Champaign, 1977. 8. H. E. H/inninen:Proc. of 7th Int. Congress on Metallic Corrosion, Rio de Janeiro, November, 1978, ABRACO,in press.
Energy Absorption by Structural Collapse in Dual Phase Steel Tubes
OD • 0.12 i n . w a l l (4.3 x 0.3 c m ) w e r e o b t a i n e d . * T h e
P. H. T H O R N T O N There has been considerable interest recently in the u s e of d u a l - p h a s e h i g h s t r e n g t h low a l l o y (HSLA) s t e e l s b e c a u s e of t h e i r s u p e r i o r f o r m a b i l i t y i n c o m p a r i s o n t o t h a t of c o n v e n t i o n a l H S L A s t e e l s of s i m i l a r t e n s i l e s t r e n g t h . T h e i n c r e a s e i n f o r m a b i l i t y of t h e d u a l p h a s e HSLA steels arises from their lower yield strength a n d h i g h e r u n i f o r m e l o n g a t i o n in c o m p a r i s o n t o t h o s e values exhibited by the standard HSLA steels. The u s e of m a t e r i a l s i n s t r u c t u r e s to a b s o r b k i n e t i c e n e r g y by structural collapse has recently been discussed f r o m t h e v i e w p o i n t of b o t h m a t e r i a l c h a r a c t e r i s t i c s a n d t h e g e o m e t r y of t h e s t r u c t u r e 1'~ a n d it w a s c o n cluded that, with respect to the former, the energy abs o r b e d d u r i n g t h e s t r u c t u r a l c o l l a p s e of t u b e s c o u l d b e correlated with tensile strength. The dual-phase HSLA steels offer a material for structural purposes which h a s a c o m b i n a t i o n of m e c h a n i c a l c h a r a c t e r i s t i c s q u i t e d i f f e r e n t f r o m t h a t of c o n v e n t i o n a l s t e e l s . B e c a u s e t h e s e m a t e r i a l s a r e c a n d i d a t e s f o r u s e in s t r u c t u r a l a p p l i c a t i o n s , it w a s d e e m e d of i n t e r e s t t o e x a m i n e t h e c o l l a p s e c h a r a c t e r i s t i c s of s u c h s t r u c t u r e s . S a m p l e s of Y A N - 8 0 s t e e l t u b e , a p p r o x i m a t e l y 1.7 i n . P. H. THORNTON is with the Research Staff, Ford Motor Cornpany, Dearborn, MI 48121. Manuscript submitted December 1 l, 1978. METALLURGICAL TRANSACTIONS A
*VAN,80 and VAN-QNare trademarks of Jones and LaughlinSteel Company. The samples were kindly provided by J. H. Bucher and P. J. McDonoughof J. and L. Steel Company. tubing was made by forming and electric butt-welding a n d t h e s a m p l e s p r o v i d e d w e r e in e i t h e r t h e a s - f o r m e d , Van-80 condition or the dual-phase (VAN-QN) and cold d r a w n c o n d i t i o n . C o m p r e s s i o n s a m p l e s , 3 i n . (7.6 c m ) , 4 i n . (10.2 c m ) , o r 6 i n . (15.2 c m ) l o n g d e p e n d i n g upon the material length available, were prepared by m a c h i n i n g to p r o v i d e w a l l t h i c k n e s s / o u t e r d i a m e t e r ( t / D ) r a
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