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Mobile structure's integrity system - mostis

This is based on the on-site measurement of structure displacements and integrates deformation behaviour and stress-strain analysis in order to perform structure integrity analysis and prevent failure due to flaws and poor design of the structure.

The catastrophic consequences of structure integrity loss are threats to people's lives, and infrastructure, environmental and air pollution damage in regions or even entire countries. Engineers are often faced with structural components with defects or flaws (e.g. corrosion flaws, fatigue and/or creep cracks). In order to continue production processes and/or to meet conditions for completing the work, it is difficult to decide the right moment for servicing structures to stop. The main reason is the lack of appropriate expert systems. Such system should take into account the real behaviour of structures, standards and procedures libraries as well as appropriate material databases. In the framework of the proposed project, the system for mobile structure integrity assessment will be developed. The mobile structure integrity system - MOSTIS -links the measurement of deformation behaviour of loaded components, material and the case study database with software for structure integrity analysis. MOSTIS provides the user with a basic engineering solution about the safe use of structures with the appropriate safety factor level. The main purpose of the proposed system is on-site failure assessment analysis and assessment of the remaining lifetime of damaged structures. In this way the repair can be carefully planned and the component life cycle optimised. MOSTIS is based on recent achievements in optical remote stereo measurements, sophisticated measurement equipment, non-destructive testing and a well established wireless mobile net. The main advantage of the optical measurement system used is the option to use it on-site and combine it with non-destructive data acquisition. MOSTIS is designed with a modular structure, which enables flexible and easy up-grades and the adoption to new applications and components. User-friendly software will enable a simple, but professional use of the system for an engineer with basic knowledge. Software with a controlling input data set and instructions will provide the user with the procedure with minimum possibility of misuse. The reliable determination of the exact size and position of defects in the component can be made by the comparison between measured deformational behaviour of construction and the deformation behaviour of a numerical model with assumed size and position of the crack. The lack of material data and actual fracture toughness can be addressed directly with measurements on the material or indirectly with micro-hardness measurements, microstructure analysis or iterative measurements with a numerical model with assumed mechanical properties. Besides the position and size of the crack on the structural component surface under load, the optical method of component meshing enables also direct measurement of fracture mechanics parameters like crack driving force. With a direct measurement of a fracture's mechanical parameters and known size and position of crack, it is possible to estimate structural integrity of the component. By developing such a system, the engineering community in Europe will gain an advanced mobile system for an on-site component flaw assessment. The idea of developing and building such a system will incorporate the use of fracture mechanics, boundary condition analysis, modern IT (Information Technology) technology, on-site measurement equipment and optical measurement technology. The optical component meshing method is extremely sensitive on surface movements. The presence of a crack on a constructional component under load has an influence on the movement field around it in terms of an incorrect shape. Participating countries / companies: - UNIVERSITY OF MARIBOR, Faculty for mechanical engineering, Maribor, SLOVENIA - WALCH D.O.O., Maribor, SLOVENIA (private company) - UNIVERSITY OF BELGRADE, Faculty for mechanical engineering, Belgrade, SERBIA AND MONTENEGRO - UNIVERSITY OF BELGRADE, Faculty of Technology & Metallurgy, Belgrade, SERBIA AND MONTENEGRO - NATIONAL INSTRUMENTS, Belgrade, SERBIA AND MONTENEGRO (private company) - UNIVERSITY OF KRAGUJEVAC, Faculty of mechanical engineering, Kragujevac, SERBIA AND MONTENEGRO Advantages of proposed product / system: * Mobile system to be used on-site on operating structure in use, * Non-destructive procedure, * Lowering cost with carefully planned repair and optimal component life cycle, * The system is suitable for homogeneous materials and also for welded structures, * The assessment is made with a computer system on-line using modern IT technology, * All input data and results are saved on a server and ready for detailed analysis, * The lack of material data can partly be overcome by using a material database, * A large database can speed-up, simplify and ease the analysis. ORGANISATION OF PROJECT - Principal partner/#: UMFS 1. - Working package: Planning of standards and procedures list for structure integrity assessment regarding to fatigue, fracture, corrosion and creep. - Task: Literature review, determination of most used cases. - Partner: TMFBg, MFBg - Duration: * start: 1 * end: 36 * total: 36 - Principal partner/#: UMFS 2. - Working package: Development of mobile optical measurement system. - Task: Design of mobile optical measurement system, set-up. - Partner: TMFBg - Duration: * start: 6 * end: 18 * total: 12 - Principal partner/#: UNO 3. - Working package: Development of instrumentation for measurement. - Task: Design of measuring systems for: pressure, load, moment, tension, dynamic load. - Partner: UMFS, TMFBg, MFKg, MFBg - Duration: * start: 1 * end: 24 * total: 24 - Principal partner/#: MFBg 4. - Working package: FEM (Fine Element Method) Modelling of structural component for stress-strain analysis. - Task: Design software subroutines for: * automatic change of materials input, * stress profile plot through thickness sections * stress-strain surface interpretation. - Partner: UMFS, TMFBg, MFKg - Duration: * start: 1 * end: 36 * total: 36 - Principal partner/#: TMFBg 5. - Working package: FEM Modelling of structural component with crack for integrity analysis. - Task: Design software subroutines for: * Stress intensity factor calculation * J-integral, CTOD calculation * Limit load solutions with different crack length. - Partner: UMFS, TMFBg, MFKg - Duration: * start: 1 * end: 36 * total: 36 - Principal partner/#: WMB 6. - Working package: General technical planning of the information system. - Task: Selection and purchase of tools and equipment, study of theoretical background, modular design of the system. - Partner: UMFS, TMFBg - Duration: * start: 1 * end: 3 * total: 3 - Principal partner/#: WMB 7. - Working package: Development of software for structure integrity assessment on server. - Task: Implementation of SIF (Stress Intensity Factor) and LL (Limit Load) solution in Structure Int. Analysis. - Partner: UMFS, TMFBg - Duration: * start: 2 * end: 24 * total: 23 - Principal partner/#: WMB 8. - Working package: Communications - Task: Design and development of communication protocols. - Partner: UMFS, TMFBg - Duration: * start: 4 * end: 19 * total: 16 - Principal partner/#: WMB 9. - Working package: Development of user interface tools. - Task: User interface for PC (Personal Computer) and PDA (Personal Digital Assistant), modules for data acquisition. - Partner: UMFS, TMFBg, MFBg, MFKg - Duration: * start: 3 * end: 18 * total: 16 - Principal partner/#: WMB 10. - Working package: Additional tools for data-handling. - Task: Development of modules for Reporting, Validation, Statistical processing. - Partner: MFBg, TMFBg, UNO - Duration: * start: 19 * end: 36 * total: 18 - Principal partner/#: MFBG 11. - Working package: Development of algorithm for comparison between FEM and experimental results. - Task: Programming of software for automatic comparison of measurement points and FEM results. - Partner: TMFBg, UMFS - Duration: * start: 1 * end: 24 * total: 24 - Principal partner/#: MFKG 12. - Working package: Modelling of dynamic effects for improved stress-strain-strain rate analysis to be inserted into the expert system. - Task: Extension of database bank for material in dynamics based on tests using Hopkinson bar. Extension of database bank for dynamic case examples. A simplified numerical modelling for dynamic fracture mechanics. - Partner: UMFS, TMFBg, MFBg - Duration: * start: 1 * end: 12 * total: 12 - Principal partner/#: WMB 13. - Working package: Validation and testing. - Task: Testing in-situ under field conditions, testing the communication safety. - Partner: UMFS - Duration: * start: 25 * end: 33 * total: 9 - Principal partner/#: WMB 14. - Working package: Development of additional variations of software equipment. - Task: Design of tutorial-demo routine, documentation. - Partner: UMFS, TMFBg - Duration: * start: 31 * end: 36 * total: 6 - Principal partner/#: UMFS 15. - Working package: Dissemination - Task: * Web site * Conference contributions. - Partner: MFBg, TMFBg, MFKg, UNO, WMB - Duration: * start: 1 * end: 36 * total: 36 - Principal partner/#: WMB 16. - Working package: Commercial activities. - Task: planning, introduction to the market, price policy, commercial activities. - Partner: UMFS - Duration: * start: 36 * end: infinitive * total: infinitive Keywords: displacement measurement, data processing, structure integrity.
Acronym: 
MOSTIS
Project ID: 
3 927
Start date: 
01-11-2006
Project Duration: 
36months
Project costs: 
750 000.00€
Technological Area: 
Internet Technologies
Market Area: 
Other construction and Building Products Related

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