Abstract
Abstract. The oblique contact-impact characteristic of the composite structural bar composed of Babbitt alloy and low-carbon steel (ZChSbSb11-6 ∕ AISI 1020) with a solid flat surface (AISI 1045) was studied theoretically and experimentally. The dynamic equation of the composite structural bar with vibration response during the contact-impact was established using the momentum theorem and assumed mode method, and the instantaneous contact forces during different impact phases were analyzed based on modified Jackson–Green model. Four sets of experiments (i.e. different proportion of Babbitt, ξ={1/8,1/2,3/4,7/8}) for the initial angle, θ=45∘, and different initial velocities were performed; and, the rebound linear and angular velocity of the contact point of composite structural bar after impact was calculated and compared with experimental results. Besides, the coefficient of restitution, the relation of contact force and contact deflection, and the permanent deformation were also compared for the composite structural bars with different proportions in combination, ξ. Three critical angles are found to determine whether the composite bar slides or not, but are prominently different for the composite bars with different ξ. In comparing with the experimental results, the numerical solutions of rebound linear and angular velocity had yield encourage results and, all relative errors were small, indicating that the simulations are in good agreement with the experimental results. Also, the oblique contact-impact behavior involving the coefficient of restitution, the relation of contact force and contact deflection, and the permanent deformation was explained in detail. It can be concluded that as the proportion of Babbitt ξ increases, the composite structural bar presents a characteristic of ease of deflection. And the contact-impact behavior of structural entity is closely related to the inherent properties of the elasto-plastic material, especially for the weak material of composite structures. The more easily the impacting object is deformed, the small the contact force during the contact-impact, which also indicates the yield strength of weak material is a very significant parameter in the event of collision. Such work could give conducive insights to contact-impact problems of the key parts or structures composed of composite materials in mechanical system.
Highlights
IntroductionContact-impact is a salient phenomenon which plays an important role pervasive in many applications involving the design and analysis of mechanical system, such as robotics (Banerjee et al, 2017; Flores-Abad et al, 2014), iron and steel metallurgy (Y. Wang, et al, 2017a), vehicles (Yuan et al, 2016), civil structures (H. Wang, et al, 2017a), composite structures (Mao et al, 2017; Park, 2017), and many other fields (Brake, 2015), since it affects motion parameters of the impacting object (e.g. rebound linear and angular velocity), contact force, and indentation deformation involving its patterns etc (Dong et al, 2018; Ghaednia et al, 2017b)
We studied the mechanical properties of the ZChSbSb11-6 Babbitt/20 steel composites with different proportions of Babbitt, and found that the elastic modulus of composite varies with different proportions of Babbitt based on the experimental results (Li et al, 2016)
The numerical simulations of the dynamic model of the composite structural bar with a solid flat surface during the oblique contact-impact events have been compared with the experimental results in terms of the linear and the angular motion, i.e., the normal and tangential velocities of the contact point after the impact, and the rebound angular velocities of the impacting object
Summary
Contact-impact is a salient phenomenon which plays an important role pervasive in many applications involving the design and analysis of mechanical system, such as robotics (Banerjee et al, 2017; Flores-Abad et al, 2014), iron and steel metallurgy (Y. Wang, et al, 2017a), vehicles (Yuan et al, 2016), civil structures (H. Wang, et al, 2017a), composite structures (Mao et al, 2017; Park, 2017), and many other fields (Brake, 2015), since it affects motion parameters of the impacting object (e.g. rebound linear and angular velocity), contact force, and indentation deformation involving its patterns etc (Dong et al, 2018; Ghaednia et al, 2017b). Wang, et al, 2017a), composite structures (Mao et al, 2017; Park, 2017), and many other fields (Brake, 2015), since it affects motion parameters of the impacting object (e.g. rebound linear and angular velocity), contact force, and indentation deformation involving its patterns etc (Dong et al, 2018; Ghaednia et al, 2017b). Various normal and oblique impact events happening on the surface of two or more colliding bodies had been studied by many researches for decades. For any contact-impact events, authors focus primarily on what happened during the impacts and/or after the impacts (Meng and Wang, 2018).
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