STEEL丸棒に対する弾性球の繰返し縦衝突(機械力学,計測,自動制御)

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In the dynamical impact analysis of rigid bodies the coefficient of restitution (COR) is often used. It is known that the COR depends on the impact speed, material properties and geometry of the impact system. Many experimental studies have been carried out to measure the COR. In addition, the influence of the material properties on the COR has been investigated for elastic, visco-elastic, elastic-plastic and visco-plastic material behavior. Numerical simulations by the finite element method have been efficiently utilized to investigate the impact and to evaluate the COR. Often machine elements are subjected to repeated impacts due to periodical loading conditions. In repeated impacts the shape and the material behavior of the bodies vary with the number of impacts. Therefore, also the COR will vary with the number of impacts. However, until now research on repeated impacts is very limited, except e.g. Seifried et al. and Graham et al.. In this paper, longitudinal repeated impacts of an elastic sphere against a steel rod are investigated numerically and experimentally. Thereby the steel rod shows a strain rate sensitivity of the yield stress. The behavior of the bodies during impact are precisely measured by using two Laser-Doppler-Vibrometers and simulated by finite elements. It is shown that the repeated impacts are simulated very accurately by finite element models which include the strain rate sensitivity of the yield stress of the steel rod. It is found that the maximal impact force and the COR increase with the number of impacts while the contact duration decreases with the number of impacts. After several impacts these quantities show saturation to a constant value.
2009-07-25

STEEL丸棒に対する弾性球の繰返し縦衝突(機械力学,計測,自動制御)

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