A Study of the Deformation of Helical Springs Under Eccentric Loading

Abstract

Much analysis has been done to date on the deformation of helical springs due to normal loadings. The aim of this study is to design a helical spring that will deform under eccentric loading a desired amount due to a given force. Under the assumptions of linear stress strain relationships, the spring will be designed in terms of its material properties and its geometry. The deformation of the spring will be made possible utilizing a Shape Memory Alloy (SMA) active element that undergoes phase transformation upon heating above a certain temperature. Two models for spring deformation have been considered. In the first model we study the differential compression of a spring using SMA wire actuators, and in the second model we investigate the bending of an SMA rod placed inside the spring. Our efforts were a first step towards the development of a structural skeleton for a minimally invasive surgical manipulator Deformation, Design, Eccentric, Spring.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1994
Accession Number
ADA283448

Entities

People

  • Andrew R. Leech

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Actuators
  • Alloys
  • Bending Moments
  • Compression
  • Engineering
  • Equations
  • Geometry
  • Helical Springs
  • Manipulators
  • Materials
  • Mechanical Engineering
  • Mechanics
  • Modulus Of Elasticity
  • Moment Of Inertia
  • Phase Transformations
  • Shape Memory Alloys
  • Shear Modulus

Readers

  • Electrical Engineering
  • Structural Dynamics.