Tests methods of specimens (in cantilever beam form) from aluminum alloy at harmonic vibration under resonance conditions are developed. Rated evaluation of mechanical stresses along the specimen length is performed. Structural and mechanical state of alloy during vibration loading is investigated. It's stated that destruction at vibration loading is connected with softening of material (microporosity development) as intensification result processes developing in crystal structure at the sign variable loading. Sclerometry method for plastic deformation activation energy and diagnosis of the construction elements residual resource is developed. It's indicated that at solving vibration strength longevity and machine designs materials quality appraisal problems it's necessary to take into account destruction mechanism features and microfailures accumulation degree both caused by vibration loading.
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