Studies of strain rate effects in the deformation of solids by means of stress pulses and ultrasonic methods. Progress report, September 1, 1983-March 31, 1984

Technical Report · Fri Nov 30 04:00:00 EST 1984

OSTI ID:5920881

Han, M; Hikata, A; Elbaum, C

Stress, strain and strain rate sensitivity mechanisms in the plastic deformation of solids were studied by subjecting samples to short duration (approx. = 200 ..mu..s) stress pulses and simultaneously measuring changes of attenuation and phase (i.e., wave propagation velocity) of an ultrasonic wave. Stress pulses are applied by means of a split Hopkinson bar. The materials used to-date were irradiated and annealed LiF single crystals, Al single crystals and a polycrystalline, commercial Al alloy. Elastic deformation, the onset of plastic deformation and subsequent strain hardening are correlated with measured ultrasonic attenuation changes ..delta cap alpha.. and phase changes ..delta.. theta. Double peaks in attenuation changes, tentatively attributed to anelastic effects, were discovered in LiF single crystals.

• Research Organization: Brown Univ., Providence, RI (USA). Metals Research Lab.
• DOE Contract Number: AC02-83ER45018
• OSTI ID: 5920881
• Report Number(s): DOE/ER/45018-1; ON: DE85009463
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
360603 -- Materials-- Properties
ACOUSTIC TESTING
ALKALI METAL COMPOUNDS
ALUMINIUM
ANNEALING
ATTENUATION
CRYSTALS
DEFORMATION
ELEMENTS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HEAT TREATMENTS
LITHIUM COMPOUNDS
LITHIUM FLUORIDES
LITHIUM HALIDES
MATERIALS TESTING
MECHANICAL PROPERTIES
METALS
MONOCRYSTALS
NONDESTRUCTIVE TESTING
PHYSICAL RADIATION EFFECTS
PLASTICITY
RADIATION EFFECTS
RESEARCH PROGRAMS
SOLIDS
STRAIN RATE
TESTING
ULTRASONIC TESTING
WAVE PROPAGATION