PSI - Issue 47

Dmitry Ledon et al. / Procedia Structural Integrity 47 (2023) 213–218 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

215

3

Fig. 1. Scheme of the experiment. The numbers in the figure mean: 1 - detachable tooling for fixing the specimen; 2 - specimen; 3 - water curtain (laminar flow); 4 - Al foil glued to the specimen; 5 - laser impact zone

The optical part (objective) of the VISAR interferometer was mounted on a manipulator, on which a holder with a target-specimen was attached. This was done to ensure the accuracy of positioning and alignment of the beams of the loading laser and the VISAR measuring laser. Aluminum foil with a layer of adhesive from 100 to 150 µm thick was used as a "sacrificial" coating. In fact, it played the role of a projectile. Structural studies were carried out on loaded sample and characteristic types of morphology on the target cross-section were observed revealing the signs of spall fracture on some targets (Fig. 2). Determining the loading regimes under which spall failure occurs is the goal of numerical simulation. The studies were carried out on the example of zirconium alloy E110 material.

Fig. 2. Characteristic types of loaded specimens. There are signs of spall fracture (left). There are no signs of spall fracture (right)

3. Mathematical formulation of the problem The system of balance equations and constitutive relations for describing the deformation behavior and fracture of metals and alloys, which was used in this work, has the following form (Bayandin (2021), Naimark (2003), Saveleva (2016)):   σ v= (1)

(2)

0

 v=