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1.033/1.57 Mechanics of Material Systems Strain Gage Rosette Graphical Determination Measurement: 3 Relative Length Variations from Strain gages λ 1, λ 2, λ b Aim: Find ε 12 =γ(e 1,e 2 )

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1.033/1.57 Mechanics of Material Systems 1. λi (i=1,2,b) in Mohr Plane

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1.033/1.57 Mechanics of Material Systems 2. Center: λ c =(λ 1 +λ 2 )/2

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1.033/1.57 Mechanics of Material Systems 3. ε 12 = λ b(λ 1 +λ 2 )/2 = λ b λ c Construction circle of Radius ε 12 = λ b λ c

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1.033/1.57 Mechanics of Material Systems 4. The Mohr Circle

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1.033/1.57 Mechanics of Material Systems 5. The Strain Vectors: OE(e 1 ) P-Plane

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1.033/1.57 Mechanics of Material Systems 6. The Strain Vectors: OE(e 2 ) P-Plane

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1.033/1.57 Mechanics of Material Systems 7. The Strain Vectors: OE(n b ) P-Plane

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