Dynamic measurement of strain in test specimen by fringe projection

摘要

We use the projected fringes technique to follow the changes induced in the topography of metallic sample sheetssubjected to uniaxial tensile tests. Since in-plane strains are associated with out-of-plane deformations, the monitoring ofthickness variation of the tensile specimens can be used to detect necking and shear band formation. A sequence ofimages of the fringe pattern was captured and processed by means of the Fourier transform technique. We measured thematerial behavior in the elastic and plastic zones during its elongation until fracture took place. We present experimentalresults for stainless and hot rolled steel sheets.