Abstract
In this paper, the non-contacting stress measuring method by using the fluorescence lifetime is studied under bending loadings. The test piece is made from acrylic resin that is contained a fluoreseent material. The laser beam is applied to this test piece, aod time dependence of fluorescence is observed by the streak camera. Various strains are added to the Test piece by four poinis bending, and time dependence of fluorescence is measured. Time dependence of fluorescence is analyzed with least-square method, using one exponential response function convoluted with a measured instrumental pulse profile. It is found that the fluorescence lifetime is decreasing with increasing strain by cases the bending test.
