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Inegrated autocorrelation method for plastic strain determination
Author(s) -
Dal Y Z,
Tay C J,
Chiang F P
Publication year - 1990
Publication title -
strain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.477
H-Index - 47
eISSN - 1475-1305
pISSN - 0039-2103
DOI - 10.1111/j.1475-1305.1990.tb01884.x
Subject(s) - autocorrelation , brass , speckle pattern , materials science , shear (geology) , tensile testing , optics , composite material , acoustics , ultimate tensile strength , mathematics , metallurgy , physics , statistics , copper
This paper presents an integrated autocorrelation method for the measurement of plastic deformation in metallic materials. The method employs a laser beam to illuminate the test objects. The diffracted images are digitised, recorded and processed on a computer based image processing system. The subsequent speckle pattern correlation analysis yields information on the surface deformation of the test objects. The technique is applied to brass tensile specimens and it is found that the integrated autocorrelation coefficient is linearly proportional to the plastic shear strain. For the range of plastic strain measured the error involved would be less than 10%.