Abstract
Five elastic stiffness coefficients of UD-GFRP were estimated by using a laser iso-angular scanning method. Four stiffness coefficients C 33, C 11, C 66 and C 44 (direction 3 being the fiber direction) were first accurately determined by using phase velocities of longitudinal and shear waves in the fiber and fiber-normal directions. The stiffness C 13 was estimated by iteration so that the slowness curve of quasi-shear waves computed to an assumed C 13 best matches the measured one. The estimated stiffness coefficients agreed quite well with those estimated by the through-transmission method in water.
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