T06 Strain

# T06 Strain - Strain T06 Basics Strain is not a vector xx xy...

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Strain T06

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Basics Strain is not a vector ( g ij is not a component of strain, …but ½ g ij is) Units of strain = Length per unit length [L/L] in/in, m/m units of “ ” are often provided, i.e., unitless “%” is often used: 0.2% strain = 0.002 change in angle: radians, not degrees 11 22 xx xy xz xx xy xz xy yy yz xy yy yz xz yz zz xz yz zz g   
Deformation 11 22 xx xy xz xy yy yz xz yz zz g    ;; ; ; xx xy xz yy xz xx xx xy zz u u u x y z vv yz w u x x z uu y g   displacement in x-dir displacement in y-dir displacement in z-dir u v w

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Normal Strain,
Shear Strain, g

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Example The rectangular plate is distorted into a parallelogram as shown by the dashed lines. Determine xx , yy , and g xy . x y 400 mm 300 mm 3 mm 6 mm 2 mm
Strain Gages Experimental method to measure normal strain

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Strain Rosettes 1 2 1 2 xx xy xy yy g g    ½ g y ' 2 2 ( ) cos
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## This note was uploaded on 12/19/2010 for the course EGR 75 taught by Professor Virgin during the Fall '08 term at Duke.

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T06 Strain - Strain T06 Basics Strain is not a vector xx xy...

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