THE CONSTRUCTION DETAILS OF AN AUTOMATIC RECORDING TEMPERATURE CONTROLLED TORSION MACHINE

Abstract

The device automatically plots torque-twist curves during the course of a test and shuts off when the total angular displacement reaches 720. Any rate of strain from 360/hr to 180/min may be obtained and held constant within 1%. The torque is measured by the expansion of a ring dynamometer coupled to an adjustable lever at right angles to the axis of rotation of the bar. An electrical signal corresponding to the expansion of the dynamometer is fed to the Y-arm of an X-Y recorder (Leeds & Northrup modified Series 600 Speedomax). A signal obtained from a voltage-dividing potentiometer connected to an angular extensometer is connected to the X-arm of the recorder. The apparatus includes a temperature control which is actuated by temperature changes of + or -0.25 C. The sensing element is a 25-ohm platinum resistance thermometer. The arrangement by which liquid nitrogen is introduced into the cooling container, the pumping method, and the reservoir and reservoir control are described.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jun 15, 1953
Accession Number
AD0022145

Entities

People

  • E. P. Klier
  • Sheldon Spachner

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Barometric Pressure
  • Chemical Engineering
  • Circuits
  • Containers
  • Cooling
  • Coordinate Systems
  • Hardening
  • Low Temperature
  • Measurement
  • Resistance
  • Resistance Thermometers
  • Right Angles
  • Strain Hardening
  • Strain Rate
  • Telemetry Equipment
  • Temperature Control
  • Torsion Bars

Readers

  • Fluid Dynamics.
  • Inertial Navigation Systems.
  • Mechanical Engineering/Mechanics of Materials.