Design synthesis of distributed compliant mechanisms is often a two-stage process involving (a) conceptual topology synthesis and a subsequent (b) refinement stage to meet strength and manufacturing specifications. The usefulness of a solution is ascertained only after the sequential completion of these two steps that are, in general, computationally intensive. This paper presents a strategy to rapidly estimate final operating stresses even before the actual refinement process. This strategy is based on the uniform stress distribution metric, and a functional characterization of the different members that constitute the compliant mechanism topology. Furthermore, this paper uses the underlying mechanics of stress bound estimation to propose two rule of thumb guidelines for insightful selection of topologies and systematically modifying them for an application. The selection of the best conceptual solution in the early stage design avoids refinement of topologies that inherently may not meet the stress constraints. This paper presents two examples that illustrate these guidelines through the selection and refinement of topologies for a planar compliant gripper application.
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June 2017
Research-Article
Estimating Optimized Stress Bounds in Early Stage Design of Compliant Mechanisms
Sree Kalyan Patiballa,
Sree Kalyan Patiballa
Department of Industrial and
Enterprise Systems Engineering,
University of Illinois Urbana-Champaign,
Urbana, IL 61853
e-mail: patibal2@illinois.edu
Enterprise Systems Engineering,
University of Illinois Urbana-Champaign,
Urbana, IL 61853
e-mail: patibal2@illinois.edu
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Girish Krishnan
Girish Krishnan
Mem. ASME
Department of Industrial and
Enterprise Systems Engineering,
University of Illinois Urbana-Champaign,
Urbana, IL 61853
e-mail: gkrishna@illinois.edu
Department of Industrial and
Enterprise Systems Engineering,
University of Illinois Urbana-Champaign,
Urbana, IL 61853
e-mail: gkrishna@illinois.edu
Search for other works by this author on:
Sree Kalyan Patiballa
Department of Industrial and
Enterprise Systems Engineering,
University of Illinois Urbana-Champaign,
Urbana, IL 61853
e-mail: patibal2@illinois.edu
Enterprise Systems Engineering,
University of Illinois Urbana-Champaign,
Urbana, IL 61853
e-mail: patibal2@illinois.edu
Girish Krishnan
Mem. ASME
Department of Industrial and
Enterprise Systems Engineering,
University of Illinois Urbana-Champaign,
Urbana, IL 61853
e-mail: gkrishna@illinois.edu
Department of Industrial and
Enterprise Systems Engineering,
University of Illinois Urbana-Champaign,
Urbana, IL 61853
e-mail: gkrishna@illinois.edu
1Corresponding author.
Contributed by the Mechanisms and Robotics Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received October 19, 2016; final manuscript received March 16, 2017; published online April 12, 2017. Assoc. Editor: Massimo Callegari.
J. Mech. Des. Jun 2017, 139(6): 062302 (12 pages)
Published Online: April 12, 2017
Article history
Received:
October 19, 2016
Revised:
March 16, 2017
Citation
Patiballa, S. K., and Krishnan, G. (April 12, 2017). "Estimating Optimized Stress Bounds in Early Stage Design of Compliant Mechanisms." ASME. J. Mech. Des. June 2017; 139(6): 062302. https://doi.org/10.1115/1.4036305
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