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首页> 外文期刊>International journal of mechanics and materials in design >Springback of a fully-clamped metallic beam loaded impulsively
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Springback of a fully-clamped metallic beam loaded impulsively

机译：Springback of a fully-clamped metallic beam loaded impulsively

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摘要

Upon impulsively loading a fully-clamped steel beam by firing a metallic foam projectile via a light-gas gun, a significant gap was experimentally observed between its transient peak deflection monitored during impacting and its permanent (residual) deflection measured after the impact was complete, i.e., springback had occurred. Finite element (FE) simulations were then performed to provide details concerning the evolution of stress and strain distributions as well as the initiation and traveling of plastic hinges in the beam, and the numerically calculated peak and residual deflections compared favorably with those measured experimentally. Subsequently, based upon the three distinct stages identified for the dynamically loaded beam, a beam-hinge analytical model was established to predict its springback response under sufficiently large uniform impulse, such that a portion of the beam or the entire beam was plastically yielded. The analytical predictions were compared with FE simulation results, with good agreement achieved. The validated model was then employed to systematically study the evolution of springback, the peak springback, the key factors affecting the magnitude of peak springback, and the roles played by different components constituting the internal energy stored in the beam. It was demonstrated that, as the impulsive load was increased, springback increased within the elasticity-dominated stage but decreased within the plasticity-dominated stage; the beam made of a metal having a higher yield strength exhibited a smaller peak deflection and a greater capacity to store elastic strain energy. Additional FE simulations revealed that strain hardening and strain rate effect led to further enhancement of springback. The present study clearly showed that springback is significant in dynamically loaded metallic structures, and hence should be accounted for in not only the design of practical protective structures but also their performance assessment.

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