Abstract: A strain gage rosette for internal stress measurement on workpieces according to the bore hole method has at least three pairs of diametrically opposed measuring grids all at an equal radial spacing and in different directions radially about a centering mark. The two measuring grids of each diametrically opposed pair are circuit-connected or coupled with one another such that the measurement signals thereof are averaged.

Abstract: The invention relates to a strain gage rosette for internal stress measurement on workpieces according to the bore hole method, which comprises at least three measuring grids 3, 4, 5 within an angular range of 0-<180° at equal spacing and in different directions radially about a centering mark 2. The invention is characterized in that, to each one of the at least three measuring grids 3, 4, 5 there is allocated respectively a similar measuring grid 6, 7, 8, that is lying oppositely and oriented in the same direction. In that regard, all measuring grids 3, 4, 5, 6, 7, 8, 16, 17 have the same radial spacing to the centering mark 2. Whereby the oppositely lying measuring grid pairs 3, 8; 4, 7; 5, 6; 16, 17 of one strain direction circuit-connected or coupled with one another such that the measurement signals thereof are averaged.

Abstract: In an apparatus for determining loads on fiber composite components (1), especially of vehicle and aircraft parts, strain gages (3) are integrated in the components (1) for determining strains. The strain gages (3) are connected with an evaluating apparatus (4), for monitoring and determining loads that tend to cause damage. The strain gages (3) are preferably integrated into the fiber composite component (1) such that the measuring grids (5) thereof are laid between individual fiber layers (2) and are guided out of the component (1) ready for connection via special connecting pins (8) to the associated evaluating apparatus (4) via loose cable connections (12).

Abstract: The invention relates to an apparatus for the determination of loadings on fiber composite components (1), especially of vehicle and aircraft parts, whereby the components (1) are provided with a prescribed number of sensor elements (3), for the determination of strains. The sensor elements (3) are connected with an evaluating apparatus (4), which is especially embodied for the monitoring and also for the determination of loadings that tend to cause damage. The apparatus is characterized in that the sensor elements are embodied as strain gages (3). In that regard, the strain gages (3) are preferably integrated into the fiber composite component (1) in such a manner so that the measuring grids (5) thereof are laid between the individual fiber layers (2) and are guided out of the fiber composite component (1) ready for connection via special connecting pins (8).