PSI - Issue 32

V.A. Oborin et al. / Procedia Structural Integrity 32 (2021) 152–157 Author name / Structural Integrity Procedia 00 (2019) 000–000

154

3

a)

b)

Fig.1. Experimental scheme (a) and photo of target in assembly (b) maintaining the impact-compressed state of specimens made of aluminum alloy VT6. The explosive conical lens consists of explosive (1) – paraffin insert (2); (3) - steel weakening plate; (4) – aluminum striker. Specimens of a special shape were cut out from the remaining VT6 plates for conducting fatigue tests (Fig.2).

Fig.2. Geometry of the specimen.

To determine the mechanism of internal crack formation, the method of amplitude-frequency analysis of changes in the effective elastic properties of materials was used as proposed by Cantrell (2001), Kumar (2011) on the basis of acoustic properties. The resonance testing machine (Shimadzu USF-2000) was combined with a highly sensitive inductive sensor and an analog-to-digital converter system (Fig. 3) that measured the amplitudes and frequencies of oscillations of the free end face of the specimen.

Fig. 3. The experimental setup: 1—horn, 2—specimen, 3—cooling system, 4—displacement sensor, 5—controlling and analog-digital converter