By Karl Hoffmann

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**Extra resources for An Introduction to Measurements using Strain Gages **

**Sample text**

Short strain gages are of advantage here, since a long strain gage would give an undesired mean value. The interdependence between the measured value and the length of measuring grid is shown schematically in Fig. 2-5. The curve should indicate the actual change in strain along the notched specimen. l4. The peak value is only correctly obtained with the short strain gage of length l4. 3 Selection criteria 41 error, % On this basis it could be assumed that a length of measuring grid equal to zero would be ideal, but of course limits must be set.

3-2b. 2 Terms and units 27 With “linearly elastic” materials there is a linear rise in the ı/İ curve in the region of elastic deformation. The slope in this section of the diagram characterizes the material's rigidity. This is expressed as the ratio between ı and İ is termed the modulus of elasticity or Young's modulus having the symbol E. 3-1) Young's modulus is the value of the ratio ı/İ and has the units [Pa] or [N/cm²] or [N/mm2]. 1 Pa = 1 N/m² = 10-4 N/cm² = 10-6 N/mm² or 1 N/mm² = 102 N/cm² = 106 N/m² = 106 Pa.

G. 7. There are definitions for longitudinal expansion, surface expansion and volume expansion. Thermal longitudinal expansion is of interest in strain measurement. e. reference length l2 = final length after temperature change ¨1 = change in length due to change in temperature ¨ȣ = temperature change, positive for heating, negative for cooling The ratio m/m is also canceled here so that the unit is dimensioned only with 1/K. Note: The longitudinal expansion coefficient Į is dependent on the material and the temperature.

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