An Introduction to Measurements using Strain Gages by Karl Hoffmann

By Karl Hoffmann

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Stainless steel, and attachment is by spot welding. 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.

A complete picture of the stress distribution is obtained, but the measurement object is lost. Therefore, such destructive methods are not suited to normal problems in stress analysis. Instead methods are needed which require only minor interference with the test object. 3) and the ring core method [3-5] are among these. 3. 4 Stress states These are subdivided as follows: a) the uniaxial stress state, b) the biaxial or planar stress state, c) the triaxial or three-dimensional stress state. The uniaxial stress state is the simplest case.

2-2: Formation of shear stress. a) panel cutters b) riveted joint If the forces are so large that the strength of the material is exceeded, the neighboring parts of the material move relative to one another over the whole cross-section and the part is “sheared”. The forces are identified with half arrows in Fig. 2-2a. Half arrows are used, because the distance l is very small and close to zero. 6). Shear stresses are designated with the symbol IJ. The example in Fig. 2-2b illustrates a similar situation with a riveted joint.

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