Impact-induced transient deformation analysis by means of digital speckle pattern interferometry

DÍAZ, F.V.; KAUFMANN, G.H.

EXPERIMENTAL MECHANICS

SPRINGER

Año: 1999 vol. 39 p. 311 - 316

0014-4851

Transient in-plane displacements generated in a metal plate subjected to impact loading are measured using a pulsed digital speckle pattern interferometry system. Two separated speckle patterns produced by a ruby laser that freezes the object motion are recorded using a CCD camera and stored in a frame grabber. Transient displacements are evaluated by digital analysis of the fringes generated by the subtraction of these speckle patterns. The computer used for image processing is also utilized to control image acquisition and to synchronize the laser pulses to the CCD camera and the object position. Experimental results are compared with numerical calculations obtained using the finite-element method.