STRAIN DETERMINATION IN A CARBON FIBER COMPOSITE BEAM BY OBJECTIVE SPECKLE OF STICKLING FOIL

In this paper a new metkod referred to as objective speckle of sticking foil. has been employed in order to deterrizine strain distribution in a carbon fiber composite box beam.The specimen surface was treated by relative easy techniques.Three fullfield contour maps are obtained with clear lines of equal displacemet in 0°, 90°, and 45° directions, respectively.The experiment was carried out in an ordinary labor atory without a dark room or a vibration isolation bench.The results are agreed well with those by calculation according to the theory of engineering bea ms and by measuring of electrical-resistance strain gages.