By Karl Hoffmann
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Extra resources for An Introduction to Measurements using Strain Gages
1-2: Model lest for “absolute change of length”. The length l01 and the length l02, which is twice as large as l01, are marked as base lengths on a freely suspended, bar-shaped object. Then the bar is loaded with force F. A measurement shows that the increase in length ǻl2 is twice as great as ǻl1. 1-2) However, if the change of length is expressed as a ratio of the base length, the same figure is obtained in each case. 2 Relative change of length or strain In the previous section it was shown that the length ratios ǻl1:l01 and ǻl2:l02 are the same, assuming equivalent strain conditions.
Fig. 2-15 shows some examples. Because of the steel base, these strain gages have a very high strain rigidity. g. in steel construction. Fig. 2 Free-grid strain gages, high-temperature strain gages Free-grid (strippable carrier) strain gages are mainly used in extremely high or low temperature ranges. The measuring grid is fixed to an auxiliary carrier, which is removed during bonding, see Fig. 2-16. Ceramic adhesive is used for bonding; with the platinumtungsten alloy measuring grid, this enables non-zero referenced measurements to be carried out in the high temperature region up to 800°C.
There is no strain gage that fulfils all requirements. For this reason numerous different strain gages are available and are supplemented with special types when required. It is a question of the manufacturer's business strategy of whether he maintains a range which is kept within bounds or of whether he allows it to grow to mammoth proportions. Most problems can be solved with a carefully conceived range of defined limits without needing to resort to special manufacture. Selection is then easier for the user.
An Introduction to Measurements using Strain Gages by Karl Hoffmann