Question

2.25 Strain gauges Consider the derivation of Equation 2.26 for metal strain gauges. Is the equation the same if the cross section that is a rectangle with dimensions a x b instead of a circular area of diam eter D? Does this equation depend on the shape of the cross section? What would be the advantage of using a gauge made from thin film strips on a carrier substrate that could be bonded to the structure under test? How important is the substrate in strain measurements? and =E =,= -vE D whereis the Possion ratio (defined =e/e ). The strain we wish to measure is e, or simply e ( e). We can substitute the above definitions into Equation 2.25 to derive the metal strain gauge equation Metal sirain SR =(12)e R [2.26 gauge equation

Answer 1

S D L JAle kmaa thet A R PA D2 paahia diteaeatiati Daing SR= 4 LX-2X -2LSD + SL D2 4 DI -2LSD+DS / D3 eaun 4/ 78 C877 D3 4- L D2 -2LSD+DS LD (87

L 28D L R 2 &208 i+20) 429)E R

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