Effect of complex combined loading mode on the fracture toughness of titanium alloys

Automated Method for Fractographic Analysis of Shape and Size of Dimples on Fracture Surface of High-Strength Titanium Alloys

“…Static tests were performed and DNP was realized by impact-oscillatory loading [18,19] on specimens from sheet two-phase high-strength alloy VT23 with a thickness of 3 mm. The breaking force of brittle specimens was in the range of 42-156 kN.…”

“…This is especially important in the case of plastic deformation when strains are initiated and localized, as well as in describing and interpreting the behavior of materials under difficult deformation conditions, in particular, in the dynamic non-equilibrium process (DNP), when a "short-term" exposure of the material structure can completely change its properties. [18]. The use of computer analysis methods to solve such problems allows obtaining fundamentally new information and detailing the physical laws of deformation and fracture of materials, in particular, the micromechanical parameters of pores formed during static and dynamic deformation can be obtained, which are difficult to detect by other methods.…”

Impact of Dynamic Non-Equilibrium Processes on Fracture Mechanisms of High-Strength Titanium Alloy VT23

“…When evaluating the effect of impact-oscillatory loading on the improvement of the plastic properties of the titanium alloy VT23, the following variant of controlling the impulse introduction of energy into the titanium alloy under impact-oscillatory loading was used [1]. In particular, a series of specimens was loaded statically to an increasing strain level of 0.025 to 0.4%.…”

“…It is known that the realization of dynamic non-equilibrium processes (DNP) due to impact-oscillatory loading allows to significantly improve the plastic properties of two-phase high-strength titanium alloys at room temperature [1,2]. However, choosing the optimal conditions of subjecting the material to the action of force pulses is important for such mechanical tests.…”

“…In addition, its use makes it possible to offer physically adequate models of deformation and fracture of materials under the DNP. It is now well established that impact-oscillatory loading affects the structure and substructure of the grains of two-phase high-strength titanium alloys and changes the distribution of internal stresses within grains and on grain boundaries [1,2,7]. This, as a rule, causes the plasticization of titanium alloys.…”