Egon Orowan (in Hungarian Orován Egon) (August 2, 1901 — August 3, 1989) was an Hungarian/US physicist and metallurgist.

Life

Born in the Obuda district of Budapest, Orowan's father, Berthold, was a mechanical engineer and factory manager, and his mother, Josze Spitzer Ságvári, the daughter of an impoverished land owner. In 1928, Orowan commenced his education at the Technical University of Berlin in mechanical and electrical engineering but soon transfered to physics, completing his doctorate on the fracture of mica in 1932. He seems to have experienced some difficulty in finding immediate employment and spent the next few years living with his mother and ruminating on his doctoral research.

In 1934, Orowan, roughly contemporarily with G. I. Taylor and Michael Polanyi, realised that the plastic deformation of ductile materials could be explained in terms of the theory of dislocations developed by Vito Volterra in 1905. Though the discovery was neglected until after World War II, it was critical in developing the modern science of solid mechanics.

After working for a short while on the extraction of krypton from the air for the manufacture of light bulbs, in 1937 Orowan moved to the University of Birmingham, England where he worked on the theory of fatigue collaborating with Rudolf Peierls.

In 1939, he moved to the University of Cambridge where William Lawrence Bragg inspired his interest in x-ray diffraction. During World War II, he worked on problems of munitions production, particularly that of plastic flow during rolling. In 1944, he was central to the reappraisal of the causes of the tragic loss of many Liberty ships during the war, identifying the critical issues of the notch sensitivity of poor quality welds and the aggravating effects of the extreme low temperatures of the North Atlantic.

In 1950, he moved to the Massachusetts Institute of Technology where, in addition to continuing his metallurgical work, he developed his interests in geological and glacialogical fracture and in what he termed socionomy. In the latter study, Orowan developed the writings of the 14th century Tunisian historian Ibn Khaldun to forecast an eventual failure of market demand similar to that predicted by Karl Marx. His ideas found little acceptance among the majority of economists.

Throughout his life, he patented many inventions.

Honours

• Member of the American Academy of Arts and Sciences, (1951)
• Member of the National Academy of Sciences, (1969);
• Eugene Bingham Medal of the American Society of Rheology , (1959);
• Gauss Medal of the Braunschweiger Wissenschaftliche Gesellschaft , (1968);
• Vincent Bendix Gold Medal of the American Society of Engineering Education , (1971);
• Paul Bergse Medal of the Danish Metallurgical Society , (1973);
• The Acta Metallurgica Gold Medal, (1985).

External links

• Biographical Memoir of the National Academy of Sciences