Abstract
When two or more bodies collide, contact occurs between two surfaces of the bodies so that they cannot overlap in space. Metal formation, vehicle crash, projectile penetration, various seal designs, and bushing and gear systems are only a few examples of contact phenomena. This chapter is organized as follows. In Sect. 5.2, simple one-point contact examples are presented in order to show the characteristics of contact phenomena and possible solution strategies. In Sect. 5.3, a general formulation of contact is presented based on the variational formulation. Sect. 5.4 focuses on finite element discretization and numerical integration of the contact variational form. Three-dimensional contact formulation is presented in Sect. 5.5 . From the finite element point of view, all formulations involve use of some form of a constraint equation. Because of the highly nonlinear and discontinuous nature of contact problems, great care and trial-and-error are necessary to obtain solutions to practical problems. Section 5.6 presents modeling issues related to contact analysis, such as selecting slave and master bodies, removing rigid-body motions, etc.
The original version of this chapter was revised. An erratum to this chapter can be found at https://doi.org/10.1007/978-1-4419-1746-1_6
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Notes
- 1.
Rigorous discussions on this topic with variational inequality and its equivalence to the constrained optimization can be found in J. Sokolowski and J. P. Zolesio, Introduction to Shape Optimization, Springer-Verlag, Berlin, 1991. A brief summary will be presented in Sect. 5.3.
- 2.
It will be clear later that the contact force is equivalent to the Lagrange multiplier in the constrained optimization, which is the reason to use the Greek symbol λ.
- 3.
It is interesting to note that the physical interpretation of the negative Lagrange multiplier is the force that is required to apply at the tip of the beam in order to close the gap.
- 4.
This is the Rayleigh-Ritz method. For details, readers are referred to N. H. Kim and B. V. Sankar, Introduction to Finite Element Analysis and Design, Wiley & Sons, NY, 2008.
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Kim, NH. (2015). Finite Element Analysis for Contact Problems. In: Introduction to Nonlinear Finite Element Analysis. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-1746-1_5
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DOI: https://doi.org/10.1007/978-1-4419-1746-1_5
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