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Laboratory «Dynamics and extreme characteristics of advanced nanostructured materials»

Contract number
075-15-2022-1114
Time span of the project
2022-2024

As of 01.12.2023

48
Number of staff members
14
scientific publications
2
Objects of intellectual property
General information

Name of the project: Dynamics and extreme characteristics of advanced nanostructured materials

Research directions: Mechanical engineering and machinery

Goals and objectives

Goals of project:

The creation of a new laboratory for the research of the dynamic behavior and the extreme characteristics of modern prospective nanostructured materials at the Saint Petersburg State University. The results of the research conducted by the Laboratory will lead to the development of fundamental mechanics in the field of newly developed nanostructured materials, the development of the principles of creation of new materials with specified mechanical properties as well as their operation under extreme thermomechanical loads, the development of the foundations for the creation of regulations and standards for the assessment of the strength properties of construction and medical materials under extreme impact, to the creation of the fundamental basis for the optimization of technological processes and the determination of the optimal modes of targeted deformation and destruction of these materials.

Project objective:

  1. Determining the fundamental laws of the processes of destruction and structural transformations in new advanced nanostructured materials, in particular, materials produced by combining methods of intense plastic deformation and thermal processing as well as hydrogels and coatings on the basis of the classical principles of continuous media mechanics and fundamentally new approaches to dynamic destruction and structural transformations accounting for scale and structural-temporal characteristics of the behavior of materials.
  2. Designing new experiments and developing existing experimental methods for the study of the behavior of engineering and medical materials, including nanostructured materials, nanocomposites and nanocoatings under dynamic nonstationary thermomechanical impact.
  3. Preparing recommendations for the development of the existing and the creation of new regulations and standards for the assessment of the carrying capability of industrially implemented new advanced materials in extreme operating modes.
  4. Developing the fundamental basics of the optimization technological processes and the determination of the optimal methods of the targeted attainment of physical and mechanical properties of advanced nanostructured materials.
  5. Improving the quality and appeal of education and research activities in the field of technologies of the creation and the mechanics of new advanced materials at the Saint Petersburg State University.
  6. Engaging young researchers and students in cutting-edge research and new education programs in the field of materials science, mechanical engineering and extreme states of continuous media.
  7. Improving the international reputation of the Saint Petersburg State University as the principal center of Russian education and science by means of interaction with leading scientists in this field, foreign research centers and the publication of results of the project in prestigious international academic journals.
  8. The creation of a new innovative laboratory in the domain of the dynamics and extreme characteristics of advanced nanostructured materials that will be able to continue its work at the frontier of technology in 2022-2024.
The practical value of the study

Scientific results:

  1. A fundamental analogy between the rupture of a linear oscillator and the dynamic fracture of solids is discovered, enabling a simple engineering interpretation of the complex effects of the behaviour of continuous media in extreme states under intense thermomechanical impacts. The key effects of dynamic fracture of media are revealed, in particular, the delay of fracture and the increase of ultimate stresses of the system under high-speed impact. Taking into account the inertial properties of the system helps to capture these effects and thus clearly show and explain the inapplicability of standard strength models when considering extreme loads. It is shown that the linear oscillator is a simple to use but functional tool for interpreting complex effects of rapid fracture, allowing "special" application to different cases. The mathematical model is calibrated against known experimental results on dynamic crack initiation in plates and spalling. It is demonstrated that the model shows good results despite its simplicity and the strength of the assumptions made.
  2. Based on the incubation time approach, a new model of thermal softening associated with stress relaxation, i.e., a decrease in the internal resistance to deformation as the bulk temperature increases, is constructed. Plastic deformation at extreme velocities is often accompanied by an apparent adiabatic temperature rise. A model of thermal softening of metals subjected to high-speed loading is developed. The new approach takes into account sensitivity to strain rate as a manifestation of time sensitivity of materials. A comprehensive analysis of the developed relaxation model of plasticity (RP-model) is carried out and it is shown that this model can be derived from the equation of time-dependent yield surface using the concept of incubation time. Based on experimental data for HSLA-65 steel, 93W-4.9Ni-2.1Fe tungsten-based composite and Ti-6Al-4V titanium alloy, the descriptive capabilities of the developed RP-model are compared with other determinant models (phenomenological and micromechanism-based) as well as the model of artificial neural networks (ANN).

Education and personnel occupational retraining:

4 PhD theses and 1 doctoral thesis were defended.

Cooperation:

NanoMet Company (Russia)

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Чжао Шисян, Петров Ю.В., Жанг Юи, Волков Г.А., Щю Зейцьян, Хуан Фэнлей
(2024) Modeling of the thermal softening of metals under impact loads and their temperature–time correspondence. Int J of Engn Science 194 (2024) 103969 https://doi.org/10.1016/j.ijengsci.2023.103969 Q1
Dong J, Liu G, Petrov YV, Feng Y, Jia D, Baulin VE, Li B.
(2024) Rapamycin functionalized carbon Dots: Target-oriented synthesis and suppression of vascular cell senescence. Journal of Colloid and Interface Science. 2024;660:534-44. IF=9.9, DOI: https://doi.org/10.1016/j.jcis.2024.01.032 Q1
Dong J, Wang Q, Gu T, Liu G, Petrov YV, Baulin VE, Yuan H, Li, B.
(2024) Rapamycin functionalized carbon Dots: Target-oriented synthesis and suppression of vascular cell senescence. Journal of Colloid and Interface Science. 2024;660:534-44. IF=9.9, DOI: https://doi.org/10.1016/j.jcis.2024.01.032 Q1
N.A. Kazarinov, A.A. Smirnov, Y.V. Petrov
(2024) Revisiting mass-on-spring model to address key dynamic fracture effects. Theoretical and Applied Fracture Mechanics Vol.132, 2024, 104470 https://doi.org/10.1016/j.tafmec.2024.104470 Q1
M. Arivu, A. Hoffman, J. Poplawsky, I. Spinelli, C. Dai, R.B. Rebak, J. Cole, R.K. Islamgaliev, R.Z. Valiev, H. Wen
(2024) Influence of grain size on α′ Cr precipitation in an isothermally aged Fe-21Cr-5Al alloy, Materialia, vol. 34 (2024) 102047, https://doi.org/10.1016/j.mtla.2024.102047
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