크랙을 가진 H형상 보의 동특성

In this paper, the stability of cracked cantilever H-beams subjected to subtangential follower force is investigated. Also, the effect of sub tangential coefficient and crack on the natural frequency of H-beams is presented. Based on the Euler-Bernoulli beam theory, the equation of motion is derived by the energy expressions using extended Hamilton's Principle. The crack is assumed to be in the first mode of fracture and to be always opened during the vibrations. The values of critical follower force and the stability maps of cantilever T -beams are obtained according to the sub tangential coefficient and crack severity. The results of this study will contribute to the safety testing and the stability estimation of cracked T-beams subjected to follower force.