Inference of stress and texture from the velocities of ultrasonic plate modes

Technical Report · Fri Aug 01 04:00:00 EDT 1986

OSTI ID:5338641

Lee, S S

An ultrasonic approach is proposed to independently characterize stress and texture in rolled metal plate. The apporach is based on the theory for the angular dependence of the ultrasonic wave velocity in a symmetry plane of an orthorhombic, stressed material. The theory for the angular dependence of the velocities reveals terms with two-fold, four-fold, and six-fold symmetry, which are utilized in the seperation of the stress and texture contributions. The experimental implementation has utilized measurements of the velocities of SH/sub o/ and S/sub o/ guided wave modes in thin plates. These modes are generated and detected by electromagnetic acoustic transducers. The ability to determine the directions and differences in magnitudes of principal stresses from the SH/sub o/ data is described. From a combination of the SH/sub o/ and S/sub o/ data, a procedure is proposed for determining the coefficients W/sub 400/, W/sub 420/, and W/sub 440/ in terms of an expansion to fourth order of the crystallite orientation distribution function in terms of generalized Legendre functions. Experimental results are presented for the cases of aluminum, 304 stainless steel, and copper. The results fully confirm the proposed stress measurement technique. Predictions of W/sub 440/ are also in good agreement with independent measurements based on x-ray pole figures. Refinements in the x-ray techniques are required before the accuracies of the predictions of W/sub 400/ and W/sub 420/ can be fully assessed.

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5338641
• Report Number(s): IS-T-1269; ON: DE86015775
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
42 ENGINEERING
420500 -- Engineering-- Materials Testing
ACOUSTIC TESTING
ALLOYS
ALUMINIUM
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
COPPER
CORROSION RESISTANT ALLOYS
ELEMENTS
FABRICATION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
MATERIALS WORKING
MEASURING METHODS
METALS
NICKEL ALLOYS
NONDESTRUCTIVE TESTING
PLATES
ROLLING
STAINLESS STEEL-304
STAINLESS STEELS
STEELS
STRESSES
TESTING
TEXTURE
TRANSITION ELEMENTS
ULTRASONIC TESTING