Stress and strain analysis on a thin-walled cylinder (FL 130)

Stress and strain analysis on a thin-walled cylinder (FL 130)

strain on a vessel under internal pressure

CodeFL130

Description:

  • Pipes, pressure vessels, steam boilers etc. are considered as thin-walled vessels during design.
  • The principal stresses are key variables in calculating and designing these vessels.
  • The stresses and strains occurring in a vessel are not directly measured but are
    determined by measuring the strains on the surface using strain gauges.
  • The FL 130experimental unit is used to investigate stresses and strains in a thin-walled vessel subjected to internal pressure.
  • The oil-filled vessel is closed with a lid at one end and with a movable piston at the other end.
  • A hand wheel with a threaded spindle is used to move the piston.
  • Two load cases are presented: biaxial stress state of a closed vessel such as a boiler tank and uniaxial stress state of an open vessel such as a pipe.
  • Internal pressure is generated inside the vessel by a hydraulic pump.
  • A manometer indicates the internal pressure.
  • Strain gauges are attached to the surface of the vessel to record the strains.
  • The FL 152measuring amplifier displays the measured values.
  • The measured values can be imported into the application software for visualisation to assist in the evaluation of the experiment.
  • Mohr’s stress circle is used to graphically represent the conversion of the strain and to determine the principal strains.
  • The principal stresses are calculated from the principal strains by applying the law of elasticity.

Technical Details:

Specification:

  • investigation of stresses in a thin-walled vessel under internal pressure
  • cylinder can be used as open pipe or closed vessel
  • strain gauge application on the vessel surface under varying angles
  • hermetically sealed hydraulic system, maintenance-free, for generating the compressive load
  • hydraulic system with hydraulic pump and manometer
  • FL 152 measuring amplifier required
  • software for analysing measured values in FL 152

Technical Data:

  • Aluminium vessel
    • length: 400mm
    • diameter: Ø=75mm
    • wall thickness: 2,8mm
    • internal pressure: max. 3,5N/mm2(35bar)
  • Strain gauge application
    • 5 strain gauges: half-bridges, 350 Ohm
    • angular position to the vessel axis: 0°, 30°, 45°, 60°, 90°
    • gauge factor: 2,00 ±1%
    • power supply: 10V
  • Manometer
    • 0…40bar
    • accuracy: class 1,0

Dimensions & Weight:

  • L x W x H: 700x350x350mm
  • Weight: approx. 21kg

Learning Objections/Experiments:

  • measure strains with strain gauges
  • application of Mohr’s stress circle to determine the principal strain
  • determine the principal stresses: axial and circumferential stresses by magnitude and direction
  • in an open vessel (pipe)
  • in a closed vessel (boiler)
  • comparison of open/closed vessels
  • determine Poisson’s ratio
  • investigation of relations between strains, pressure and stresses in a plane biaxial stress state

Scope of Delivery:

  • 1 experimental unit
  • 1 set of instructional material

Features:

  • cylinder with strain gauge application as vessel
  • uniaxial or biaxial stress state shown in the experiment

Accessories:

  • Required: FL 152 multi-channel measuring amplifier
  • Optional: WP 300.09 Laboratory trolley

 

Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.