Modelling the axis drift of short wire flexures and increasing their support stiffness using polymers

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

For steel flexures, complex geometries are required to reach high support stiffness and limit axis drift over large ranges of motion. These complex flexures are expensive and difficult to manufacture. This paper presents a method of designing short, polymer wire flexures with high support stiffness and modelling their axis drift using a novel method, the arc method. The arc method is validated against finite element methods (FEM) and physical tests, showing at least a factor 10 lower error than existing pseudo-rigid-body models (PRBM) at 70° deflection, while maintaining a simple modelling approach. The use of polymers increases support stiffness of wire flexures by a factor 7800 with respect to steel at 70° deflection, even though the material stiffness is substantially lower. This is due to the large allowed strain of polymers increasing the possible diameter by a factor 110.

Original languageEnglish
Title of host publication45th Mechanisms and Robotics Conference (MR)
Subtitle of host publicationASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
PublisherThe American Society of Mechanical Engineers(ASME)
Number of pages9
ISBN (Electronic)978-0-7918-8544-4
DOIs
Publication statusPublished - 2021
Event45th Mechanisms and Robotics Conference, MR 2021, Held as Part of the ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC-CIE 2021 - Virtual, Online
Duration: 17 Aug 202119 Aug 2021

Publication series

NameProceedings of the ASME Design Engineering Technical Conference
Volume8A-2021

Conference

Conference45th Mechanisms and Robotics Conference, MR 2021, Held as Part of the ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC-CIE 2021
CityVirtual, Online
Period17/08/2119/08/21

Keywords

  • Arc method
  • Compliant joint
  • Polymers
  • Support stiffness
  • Wire flexure

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