Download e-book for iPad: An Introduction to Measurements using Strain Gages by Karl Hoffmann

By Karl Hoffmann

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2-4 shows the expected measurement error against the ratio of strain gage length/particle size. g. the maximum value of stress in a notch. 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.

For measurement objects which are not too thin the forces needed to do this are negligible in comparison to the forces acting on the object. Transition sections exist for the transfer of the strain in the measurement object through the individual bonding layers up to the strain gage's measuring grid. e. - from the measurement object to the adhesive layer from the adhesive layer to the measuring grid carrier from the measuring grid carrier to the measuring grid. e. the Young's modulus, of the layer materials.

Here, the tangential and transverse strains were measured with 5 chains at 50 points on the root of the tooth. Fig. 2-7: Strain measurement with strain gage chains in the tooth root of a gearwheel, from 3-4. a) mounted strain gage with matchstick to give a comparison of size b) completed gage installation, ready for measurement 44 3 Selection criteria The left-hand picture illustrates a bonded strain gage chain and a matchstick to give a comparison of size; the right-hand picture shows the finished, wired measuring point.

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An Introduction to Measurements using Strain Gages by Karl Hoffmann

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