About optimization of the elastic deformation range by prestraining of a unidirectional composite material (Discussion o
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About Optimization of the Elastic Deformation Range by Prestraining of a Unidirectional Composite Material (Discussionof Reference 1)* M. I ~ . SHORSHOROV, L. M. USTINOV, AND Yu. G. KUZNETSOV R. W. Heckel and o t h e r s 1 a n a l y z e d the influence of p r e s t r a i n i n g of a f i b r o u s c o m p o s i t e m a t e r i a l on r e s i d ual s t r e s s e s of m a t r i x arm and f i b e r o~f. They showed that the r e s i d u a l s t r e s s e s which a r e stated in the m a t r i x and the f i b e r s a f t e r p r e s t r a i n i n g and the c r i t i c a l v o l u m e f r a c t i o n V/~ did not depend on p r i m a r y r e s i d u a l s t r e s s in the m a t r i x arm~ and the f i b e r o~f0. However, the a u t h o r s made a m i s t a k e in the s c h e m e of a c o m p o s i t e m a t e r i a l with ~ > V f (see Fig. 3(b) in p a p e r 1). The r e s i d u a l d e f o r m a t i o n in a c o m p o s i t e a f t e r r e l i e v i n g the s t r e s s a c m u s t c o r r e s p o n d to OC (Fig. 1). In a r t i c l e 1 it c o r r e s p o n d s to OC', b e c a u s e the a u t h o r s did not take into a c c o u n t b e g i n n i n g of a c o m p r e s s i o n p l a s t i c d e f o r m a t i o n in a m a t r i x . T h e r e f o r e , the r e s i d *R. W. HECKEL, R, J. ZAEHRING,and H. P. CHESK1S:Met. Trans. 1972, vol. 3, pp. 2507-13. M. Kh. SHORSHOROV is Prof., Dr. Techn. Sc., A. A. Baikov Institute of Metallurgy, USSR Academy of Sciences, Leninskij prospekt, 49, USSR. L. M. USTINOVand Yu. G. KUZNETSOV,Junior Fellow of Science, are associated with A. A. Baikov Institute of Metallurgy, USSR Academy of Sciences, Prospekt Lenina, 49, USSR. Discussion submitted April 18, 1974. METALLURGICALTRANSACTIONS
d i s t a n c e b e t w e e n the two p a r t i a l d i s l o c a t i o n s of about five t i m e s the l a t t i c e p a r a m e t e r . Thus, although the s h o r t - r a n g e i n t e r a c t i o n is f a v o r e d in low SFE m e t a l s , the p r e r e q u i s i t e of slip r o t a t i o n in the d e v e l o p m e n t of the {358}(523) o r i e n t a t i o n s is not fulfilled and the m e c h a n i s m for the d e v e l o p m e n t of {110}(112) o r i e n t a t i o n s is t h e r e f o r e the only one a v a i l a b l e . On the other hand, in a r e l a t i v e l y high SFE m e t a l s , both p r e r e q u i s i t e s can be s a t i s f i e d and the copper t e x t u r e is developed a s stated in the text. In the text we have p r e s e n t e d an a b r i d g e d v e r s i o n of the h y p o t h e s i s which might have c a u s e d s o m e confusion in the u n d e r s t a n d i n g of our e x planation.
1. Y. C. l..iuand G. A. Alers:Met. Tranx, 1973,vol.4, p. 1491. 2. H. J. Bungeand J. Tobisch:Z. Metallic, 1968,vol.59, p. 471. 3. G. Bouyssetand P. Coulomb:Mertt ScL Rev. Met., 1968,vol.65. p. 887. 4, G. Wassermann:Z. Metallk., 1963,vol.54, p. 61. 5, I. k Dillamoreand R. E. Smallman:MetalSci J., 1972,voL 6, p. 184. 6. T. Leffersand A. Grum-Jensen:Trans. TMS-AIME, 1968,vol.242, p. 314. 7. T. Leffers:Z. Metallic, 1969
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