RESEARCH ON ENERGY ABSORBING STRUCTURES. PART VIII.

Abstract

The increase of axial strain with number of cycles of torsional loading is similar to the increase of creep strain with time. The slope of isochronous curves for creep is commonly used to estimate the creep buckling of columns. Consequently, the slope of stress-strain curves at different torsional cycles, called effective modulus, may similarly estimate the buckling of columns subject to cyclic torsional loading. Tests were conducted to obtain the effective modulus of thin-walled tubular specimens of aluminum alloy 2024-T351 with axial tension and cyclic torsion. A method for calculating large deflections of elasto-plastic shells of revolution under axisymmetric loadings is presented. The problem involves two types of non-linearity; one is geometrical due to finite strain and the other is due to non-linear stress-strain relations. (Author)

Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1970
Accession Number
AD0706417

Entities

People

  • Bernard Mazelsky
  • Sheng-rong Lin
  • T. H. Lin

Tags

DTIC Thesaurus Topics

  • Alloys
  • Aluminum
  • Aluminum Alloys
  • Axisymmetric
  • Buckling
  • Deflection
  • Linearity
  • Mechanical Properties
  • Physical Properties
  • Revolutions
  • Stress Strain Relations
  • Stresses

Fields of Study

  • Engineering

Readers

  • Fluid Dynamics.
  • Mechanical Engineering/Mechanics of Materials.