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zero friction; small deformations; basic relations; minimum principles for potential energy; conditions which guarantee existence and uniqueness of weak solutions; one-dimensional spaces of rigid virtual displacements
Problems of a unilateral contact between bounded bodies without friction are considered within the range of two-dimensional linear elastostatics. Two classes of problems are distinguished: those with a bounded contact zone and with an enlargign contact zone. Both classes can be formulated in terms of displacements by means of a variational inequality. The proofs of existence of a solution are presented and the uniqueness discussed.
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