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This study presents the results of comparative tests concerning the destruction process of specimens made of material DD11, for which different hole-forming technologies (i.e. drilling and piercing) were applied. For the analysis of cross-sectional properties of a specimen in the process of destruction, relative vibrations of the specimen’s free end as a function of vibrations of a forcing mechanism...
This paper presents a method of identifying fatigue cracking of specimens made of material DD11 based on selected characteristics of the vibration signal. Acceleration of vibrations of the free end of a specimen was taken for an analysis of specimen properties during the process of fatigue cracking. Features which enable identification and monitoring of the process of specimen cross-section cracking...
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