Accession Number : AD0439384


Title :   EFFECTS OF ULTRASOUND ON DEFORMATION CHARACTERISTICS OF STRUCTURAL METALS,


Corporate Author : NAVAL ORDNANCE TEST STATION CHINA LAKECA


Personal Author(s) : Langenecker, B ; Frandsen, W H ; Fountain, C W ; Colberg, S R ; Langenecker, J A M


Report Date : Mar 1964


Pagination or Media Count : 57


Abstract : Ultrasound is presented as a new means of studying properties of metals from the viewpoint of dislocation theory. Ustrasound is shown to be efficiently absorbed at dislocations resulting in significant effects on metal plasticity. Materials used were single crystal zinc and aluminum, and polycrystalline aluminum, beryllium, steel and tungsten. Methods of specimen preparation and modified metallographic studies are presented along with sources of ultrasound (up to 100 w/sq cm at 20 kc) and devices for the determination of field intensities. A discussion is given of present theories pertaining to the interaction of ultrasonic stress waves and lattice imperfections. The basic investigations resulted in concepts of ultrasonic forming of metals where extensive yielding of metals caused by ultrasound is utilized. (Author)


Descriptors :   DEFORMATION , CRYSTAL DEFECTS , MECHANICAL WAVES , PLASTIC PROPERTIES , PROPAGATION , HARDENING , ZONE MELTING , REFINING , PHOTOELASTICITY , METAL CRYSTALS , ALUMINUM , ZINC , BERYLLIUM , STEEL , TUNGSTEN , ELASTIC PROPERTIES , X RAY DIFFRACTION


Distribution Statement : APPROVED FOR PUBLIC RELEASE