in memoriam hubert schardin

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Professor Dr. Ing. Hubert Schardin

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Page 1: In memoriam Hubert Schardin

P r o f e s s o r Dr . Ing. H u b e r t S c h a r d i n

Page 2: In memoriam Hubert Schardin

IN MEMORIAM HUBERT SCHARDIN

After a short illnes, Professor Dr. Ing. Hubert Schardin died at Freiburg, West Germany, on September 27th, 1965. Schardin was not only a scientist of international reputation, but also an efficient organizer.

He was born in Plassow (Pommern) on June 17th, 1902, as a teacher's son. He went to school at Stolp, and studied at the technological universities of Berlin and M~]nieh. Schardin was an assistant with C.Cranz, the bal- listics expert, when he took his honours degree. Schardin's thesis was en- titled "Ueber das TSplersehe Schlierenverfahren". After a sojourn in China, during the 1935/36 winter, Schardin was appointed professor, and director of the Technical Physics and Ballistics Institute of the Luftwaffe Academy, Berlin-Gatow. This institute was transferred to South West Germany to- wards the end of the war, and finally converted into a Franco-German research institute established at St. Louis, France. Professor Schardin headed this institute until 1964, together with R. Cassagnon, the French co -director.

In the last year of his life, Schardin was in charge of the Technical Department of the Defence Ministry in Bonn. He was always actively con- cerned with education, making it his duty to promote training facilities for future scientists. Accordingly, after the war Schardin got in touch with the university of Freiburg, this being the German centre of learning nearest to St. Louis, France, where he continued as co-director. Freiburg university nominated him honorary professor at its Physical Institute, where he built up a department for applied physics. By 1959 this department had developed to the present Ernst Mach. Institute (of the Fraunhofer Society) at Fret- burg, with a section at Well. From Schardin's scientific work, reported in more than a hundred publications, we shall here mention only some of the most important subjects.

Indicative already of his later scientific activity was his first publication on a multiple spark camera (1929), which Cranz co-authored. It was the start of Sehardin's life-work, in the course of which he raised to a proper scientific discipline what had previously been a high-speed measuring tech- nique developed for special ballistic problems. He was thus particularly interested in the application of modern methods - e.g. schlieren, shadow and interference optics -, to studies of high-speed phenomena. These methods would make processes visible which previously had defied obser- vation. There are numerous applications of methods that have been intro- duced or extended by Schardin, especially in fields of solid state dynamics and flow-dynamics. In the wide range of problems that he worked on, only a few may be mentioned: propagation of elastic waves, dynamic behaviour of m a t e r i a l s at h i g h - s t r a i n r a t e s , f r a c t u r e dynamics , p e n e t r a t i o n of a r m o u r p la te , s h a p e d - c h a r g e s , p ropaga t ion of s h o c k - w a v e s in gases and t h e i r e f fec t on d i f f e r e n t types of m o d e l s , p e r t i n e n t p r o b l e m s of p r o t e c t i n g s t r u c t u r e s aga ins t s h o c k - w a v e s , i nves t iga t ion of flow a round spec i f i c mode l s and d e r i v a t i o n of s i m i l a r i t y laws fo r sca le mode l s .

Sehard in devoted about twenty p a p e r s to the phenomenon of f r a c t u r e , m a i n l y in g l a s s e s and p l a s t i c s . In this f ie ld he b e c a m e welknown, when in 1937 he d i s c o v e r e d the m a x i m u m f r a c t u r e ve loc i ty in g lass and def ined these m e a s u r e m e n t s f o r g l a s s e s of d i f f e r en t c h e m i c a l compos i t i on , us ing mul t ip le s p a r k t echn iques f o r the u l t r a - h i g h speed pho tography .

Among the m a n y awar ds which Schard in r e c e i v e d a re : the Gold Gehlhoff Ring (1958) of the G e r m a n G l a s t e c h n i s c h e G e s e l l s c h a f t f o r his r e s e a r c h on

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glass and the Gold Dupont Medal (1960) of the Soc ie ty of Motion P i c t u r e and T e l e v i s i o n E n g i n e e r s f o r his work on h igh - speed photography .

Bes ide any a s s e s s m e n t of his sc ien t i f i c a c h i e v e m e n t H u b e r t Schard in will be r e m e m b e r e d by m a n y f o r his love of f a m i l y and coun t ry , his equanami ty , his devot ion and l oya l t y to f r i ends and his c h a r m a s : a host .

On O c t o b e r 1st, 1965, Sehard in was bur i ed at Well. His fune ra l was a t tended by his c o - w o r k e r s and m a n y co l l eagues and f r i ends f r o m va r ious c o u n t r i e s .