Stress and strain analysis on a membrane Investigation of deflection and strain of a membrane under internal pressure; membrane with strain gauge application Features - deflection and strain of a membrane under compressive load - membrane with strain gauge application - determine radial and tangential stress profiles from measured strains Learning objectives/experiments - measure radial and tangential strain using strain gauges - measure deflection using a dial gauge - calculate the stresses from the measured strains: radial stress, tangential stress - determine direction of principal stress - application of Mohr’s strain circle to determine the principal strains - fundamental principle: using strain gauge technology to measure strains Specification [1] investigate the deflection and strain of a thin disk under compressive load [2] strain gauges measure in the radial and tangential direction [3] strain gauge configured as half-bridge [4] possible to measure the deflection at any radius [5] measure the deflection via adjustable dial gauge, scale indicates position along the radius [6] hermetically sealed hydraulic system, maintenance-free, for generating the compressive load [7] hydraulic system with hydraulic pump and manometer [8] FL 152 measuring amplifier required [9] software for analysing measured values in FL 152 Technical data Aluminium disk - outer diameter: Ø 230mm - diameter used in the experiment: Ø 200mm - thickness: 3mm Strain gauge application - 8 strain gauges: half-bridges, 350 Ohm - gauge factor: 2,00 ±1% - power supply: 10V Dial gauge - 0...20mm - graduation: 0,01mm Manometer - 0...1bar - accuracy: class 1,0 System pressure - max. 0,6bar LxWxH: 700x350x350mm Weight: approx. 25kg