The deformation of an elastic rod with a clamp sliding along a smooth and curved profile

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:69-70

Article

Misseroni, D.¹  Noselli, G.²  Zaccaria, D.³  Bigoni, D.¹ 

[1] Univ Trento, DICAM, I-38123 Trento, Italy

[2] SISSA Int Sch Adv Studies, I-34136 Trieste, Italy

[3] Univ Trieste, DICAr, I-34127 Trieste, Italy

关键词: Tensile buckling;    Constrained elastica;    Constraint's curvature;   

DOI  :  10.1016/j.ijsolstr.2015.05.004

来源: Elsevier

【 摘 要 】

The design of compliant mechanisms is crucial in several technologies and relies on the availability of solutions for nonlinear structural problems. One of these solutions is given and experimentally validated in the present article for a compliant mechanism moving along a smooth curved profile. In particular, a deformable elastic rod is held by two clamps, one at each end. The first clamp is constrained to slide without friction along a curved profile, while the second clamp moves in a straight line transmitting its motion through the elastic rod to the first clamp. For this system it is shown that the clamp sliding on the profile imposes nontrivial boundary conditions (derived via a variational and an asymptotic approach), which strongly influence buckling and nonlinear structural behavior. Investigation of this behavior shows that a compliant mechanism can be designed, which gives an almost neutral response in compression. This behavior could easily be exploited to make a force limiting device. Finally a proof-of-concept device was constructed and tested showing that the analyzed mechanical system can be realized in practice and it behaves tightly to the model, so that it can now be used in the design of machines that use compliant mechanisms. (C) 2015 Elsevier Ltd. All rights reserved.

【 授权许可】

Free