From the point of view of the airplane construction, its fatigue lifetime and exploitation process, the stress states
and levels are of crucial importance. The most appropriate experimental methods to determine stress values are
diffraction methods with different radiation type employed. These methods allow the determination of the elastic
lattice deformation and distortion (effectively the stress state) from the displacement and broadening of the diffraction
peak. Diffraction methods are widely known as the experimental methods for determining not only the stress values
but also the elastic properties of polycrystalline materials (also of all alloys types used in the aerospace industry). The
advantages of diffraction experiments result from their non-destructive character and the possibility to obtain absolute
values of stresses in different phases of each type of crystal material (the measurements are performed selectively only
for crystallites contributing to the measured diffraction peak, i.e. for the grains having lattice orientations for which
the Bragg condition is fulfilled). In the frame of this work, the laboratory possibilities of the Institute of Aviation in
this area are presented as well as the exemplary results of stress measurements performed there.
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