In this study, a new expression for the permanent deformation after the impact of a rod with a flat surface is given. Both flat and the surface have been considered elastoplastic. The contact has been considered frictionless and has been divided into three phases, the elastic, the elastoplastic, and the unloading phase. For the normal impact force in the loading phase, we considered a nonlinear expression that satisfies the effect of deformation on both objects by using a finite element model. For the unloading phase, the contact force has been considered to follow the Hertz theory. The simulation and experimental results were conducted for different initial impact velocities of the rod. Permanent deformation after the impact and the motion of the rod has been measured accurately in the experiments. Based on the simulation and experimental results an expression for the permanent deformation has been developed. Finally, the model has been verified and compared with previous contact models in terms of the coefficient of restitution.
Predicting the Permanent Deformation After the Impact of a Rod With a Flat Surface
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received December 12, 2013; final manuscript received September 24, 2014; published online October 23, 2014. Assoc. Editor: Zhong Min Jin.
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Ghaednia, H., Marghitu, D. B., and Jackson, R. L. (October 23, 2014). "Predicting the Permanent Deformation After the Impact of a Rod With a Flat Surface." ASME. J. Tribol. January 2015; 137(1): 011403. https://doi.org/10.1115/1.4028709
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