Abstract
In space environment, there is severe adhesive effect, and the impact contact process shows different phenomenon due to the adhesive forces. In this paper, a new impact dynamics model of a clearance joint is developed considering the adhesive effects. The Hertz contact model, L-J potential and Dugdale model are combined, and an adhesive force term is included in the original hybrid contact force model. Taking a clearance joint as an example, the theory of adhesive forces during the impact contact process is given, and the influence of the adhesive forces is investigated. Negative forces are discovered at the beginning of the contact, and the contact forces of the modified model are higher than the hybrid model. Besides, the indentation depth is also higher than the hybrid model. The energy conservation principle is employed to explain the phenomena, and the contact forces will be underestimated if the adhesive effects are ignored. This work could be contributed to estimating the contact forces and friction forces more reasonablely in the space environment.
Highlights
IntroductionThe microgravity and high vacuum are the typical characteristics
In space environment, the microgravity and high vacuum are the typical characteristics
When the journal just contacts the bearing, the adhesive forces act on the journal, which means that the journal is accelerated, and the contact forces of the modified model are higher than the hybrid model
Summary
The microgravity and high vacuum are the typical characteristics. Extending the M-D theory, Baney and Hui [19] developed a cohesive zone model to describe the adhesion between long cylinders in contact. Based on these theories, more research in this area were carried out, while the adhesion theories above were not used in impact contact force models. In this paper, taking a clearance joint as an example, based on the hybrid contact force model [9], a modified contact force model is developed combining the adhesive effects in space environment. The theory of adhesive forces during the impact process is given, and an example is presented in the final The results of these two models are compared, and the adhesive effects are discussed. Where ce is the coefficient of restitution, and δ 0 is the initial impact velocity, which are used to represent impact
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
