strain on a vessel under internal pressure
- 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.
- 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
- 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
- accuracy: class 1,0
Dimensions & Weight:
- L x W x H: 700x350x350mm
- Weight: approx. 21kg
- 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
- cylinder with strain gauge application as vessel
- uniaxial or biaxial stress state shown in the experiment
Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.