Gateway for:

Member Countries

Prediction of Material Destruction

#3735


Prediction of Material Destruction with Use of Scaling Analysis of Destruction Precursors

Tech Area / Field

  • MAT-OTH/Other/Materials
  • OBS-OTH/Other/Other Basic Sciences

Status
3 Approved without Funding

Registration date
09.04.2007

Leading Institute
VNIIEF, Russia, N. Novgorod reg., Sarov

Supporting institutes

  • Institute of Continuous Media Mechanics, Russia, Perm reg., Perm

Collaborators

  • University of Cambridge / Department of Physics, UK, Cambridge\nLos Alamos National Laboratory, USA, NM, Los-Alamos\nCEA / Direction des Applications Militaires, France, Bruyères le Châtel\nSandia National Laboratories, USA, NM, Albuquerque\nApplied Research Associates, Inc., USA, NM, Albuquerque\nAir Force Research Laboratory, USA, FL, Eglin\nUniversity of California / Center for Computational Science and Engineering, USA, CA, Davis\nGeorgia Institute of Technology / School of Materials Science and Engineering, USA, GA, Atlanta\nMichigan Technological University / Department of Mechanical Engineering - Engineering Mechanics, USA, MI, Houghton

Project summary

The goal of Project. The goal of the proposed project is study of regularities of dynamic destruction of materials with use of scaling analysis and methods of the theory of critical phenomena, as well as development of destruction models for using them in evaluation of safety of complex technical systems, objects of nuclear power engineering, prediction of consequences of tectonic phenomena. The distinctive feature of the models under development is that they will take account for evolution of defects during deformation and destruction of materials.

Up till now there are no answer on the questions about material strength associated with nucleation and growth of defects, which are important for evaluation of reliability, long-time (fatigue) dynamic strength, destruction under intensive effects. The present situation points to the insistent need for development of approaches covering basic peculiarities of destruction processes with account for physics of non-linear phenomena of defect evolution. For development of unique methods of spectral analysis using the final-amplitude spectral basis natural for processes of damage accumulation, it is planned to use the non-linear regularities of various stages, which were revealed by the project authors, for various stages of destruction as a critical phenomenon followed by nucleation of collective modes of mesoscopic defects. The regularities allowed to determine quality differences at various stages of damage accumulation, and to suggest explanation of regularities of the viscous-brittle transition. Analysis of interaction of the mentioned collective modes will be used for evaluation how much the material is close to macroscopic destruction. The basic experiments with application of these methods will be experiments with use of the methods of acoustic emission, fatigue dynamic and shock-wave tests, as well as infrared thermography, which characterizes dissipation caused by damage accumulation. It is planned to conduct comparative analysis of characteristics of dynamic scaling, which can be obtained by processing data of acoustic emission, fatigue and dynamic experiments with results of correlation analysis of morphology of surface relief and destruction surfaces – space scaling of relief induced by collective modes of defect ensembles with use of profilometry of high resolution. New methods are suggested for evaluation of material state during work in wide range of strain rates and loading amplitudes – the method of dynamic indentation and the method of quantitative fractography, which are based on fundamental results obtained by the project authors in the area of structural-scaling transitions and spectral analysis. Evaluation of reliability of materials under dynamic loading will be performed with use of characteristics of dynamic scaling of signals generated by defect ensembles and recorded with use of the polarization methods developed by the authors (polarization of laser beam in dynamically loaded transparent materials), modified Taylor test and high-velocity ballistic tests for metals, intermetallides, and ceramics.

Expected Results and their Application.

The following basic results will be obtained in the field of fundamental studies:

  • creation of phenomenology for theoretical and experimental study of role of structural-scaling transitions in defect ensembles;
  • development of fundamental bases for the methods of quantitative fractography, the methods of dynamic indentation based on analysis of regularities of destruction surface relief scaling;
  • development of fundamental bases for creation of earthquake occurrence models based on analysis of behavior of ensembles of shear defects and cracks under conditions of structural-scaling transitions.

The following basic results will be obtained in the field of applied studies:
  • suggestion of methods for diagnostics of fatigue resource based on the concept of structural-scaling transitions and developed models of hysteresis effects;
  • suggestion of models for evaluation of material reliability under dynamic and shock-wave loading;
  • suggestion to designing and operating organizations for development of reliable equipment of various purposes and safe building in seismic-risky regions.

Scientific value of Project:

Scientific value of Project is that evaluation of reliability and resource of construction materials is performed with account for evolution of real defects during loading and with use of critical phenomena of the new type – structural-scaling transitions. Basing on single grounds, it allows to make description of mechanisms of relaxation and destruction in wide range of loading intensities for phenomena of significantly different spatial and time scales.

Commercial value of Project

Commercial value of Project is creation of models of material deformation and destruction, which can be used for development of high-reliable constructions having increased service life with account for possible accidents and external effects. More effective schedule of routine maintenance can be suggested to nuclear power systems. It will allow to reduce tariffs for electric power. Schedule of safe arrangement of operations will be formulated for mining industry. Plans for safe building of industrial and civil objects will be developed for seismic-risky regions.

Project meets ISTC goals and objectives, since it:

  • provides weapon scientists and engineers with opportunities to redirect their talents for researches with obtainment of results intended for peaceful applications;
  • supports applied researches and development of technologies for peaceful purposes, especially in safety of equipment and seismic safety;
  • supports transition of Russia to market economy facilitating civil applications.

Scope of Activities

RFNC-VNIIEF scientists will:

  • perform experiments with dynamic (strain rate of 102 – 104 s-1) and shock-wave (strain rate of 105s-1) loading of structural materials, study their structures;
  • study structures of post-test samples with use of quantitative fractography;
  • participate in development of experimental-theoretical methods for evaluation of critical states;
  • carry out experiments with dynamic loading of rock samples followed by analysis of their structures, participate in development of earthquake models;
  • participate in formulation of proposals for designing and operating organizations for development of reliable equipment of various purposes and safe building in seismic-risky regions.

ICMM UB RAS scientists will:
  • perform experiments with dynamic (strain rate of 102 – 104 s-1) and shock-wave (strain rate of 105– 108s-1) loading of structural materials, study their structures;
  • perform experiments with fatigue loading of materials, dynamic indentation, as well as experiments with study of afterflow;
  • participate in development of experimental-theoretical methods for evaluation of critical states;
  • perform study of nucleation and propagation of shear cracks as earthquake mechanisms, participate in development of earthquake models;
  • participate in formulation of proposals for designing and operating organizations for development of reliable equipment of various purposes and safe building in seismic-risky regions.

Introduction of the models to practice will make important contribution to solving the problem, which is of great scientific interest and which is of important applied value for global safety, including safety of complicated technical systems, objects of nuclear engineering, prediction and evaluation of consequences of tectonic phenomena. The Project will be fulfilled by high-skilled experts from RFNC-VNIIEF and ICMM UB RAS, who are well-known in Russia and abroad due to their works in the field of dynamic strength of materials and their behavior modeling.

Role of Foreign Collaborators

It is planned to discuss the following issues with the foreign collaborators:

  1. work plan of the project;
  2. list of techniques for conduction of research experiments, list of tested materials;
  3. quality level of developed models;
  4. practical application of the models.

Technical Approach and Methodology

It is planned to solve the Project objectives with use of:

  • ballistic complexes of RFNC-VNIIEF and ICMM UB RAS, interferometer-profilometer New View 500, infrared camera JADE, electronic microscope for material structure study;
  • Hopkinson and Taylor methods for dynamic tests; methods of acoustic emission, small-angle X-ray diffraction, synchrotron radiation, infrared scanning, quantitative fractography; data from seismic catalogues.

It is planned to use the set of theoretical and calculation methods in the work, which have been successfully used in VNIIEF and ICMM UB RAS. During research experiments, it is planned to use modern techniques for recording the required parameters with use of analog digital devices and computer processing of results.


Back

The International Science and Technology Center (ISTC) is an intergovernmental organization connecting scientists from Kazakhstan, Armenia, Tajikistan, Kyrgyzstan, and Georgia with their peers and research organizations in the EU, Japan, Republic of Korea, Norway and the United States.

 

ISTC facilitates international science projects and assists the global scientific and business community to source and engage with CIS and Georgian institutes that develop or possess an excellence of scientific know-how.

Promotional Material

Значимы проект

See ISTC's new Promotional video view