공진주파수 측정을 통한 복합재료의 탄성계수 측정과 이론식과의 비교 평가

The need to develop and use light-weight structural components in the design of aircraft and automotive vehicles has brought increasing applications of composite materials. To evaluate elastic constants which are one of important mechanical properties of composite materials a method of experimentation is conceived and an experimental set-up is constructed to evaluate elastic constants of composites. The experimental method utilizes resonance phenomenon which occurs when natural frequencies of materials match externally applied frequencies. Flexural resonance frequencies are determined to evaluate Young's moduli E} and E2 which torsional resonance frequencies are measured to evaluate shear moduli G_13 and G_23. The experimentally determined values of elastic constants are compared with those values computed from theoretical considerations utilizing the rule of mixtures to establish the extent of agreement between the experimental and theoretical methods.