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Projects / Programmes source: ARIS

Fatigue strength of laser cutted elements of structures

Research activity

Code Science Field Subfield
2.11.02  Engineering sciences and technologies  Mechanical design  Special constructions know-how 

Code Science Field
T165  Technological sciences  Laser technology 
T130  Technological sciences  Production technology 
Keywords
laser cutting, fatigue strength, defects
Evaluation (rules)
source: COBISS
Researchers (6)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  27723  PhD Niko Jezernik  Manufacturing technologies and systems  Junior researcher  2007 - 2008  28 
2.  01375  PhD Janez Kramberger  Mechanical design  Head  2007 - 2009  530 
3.  04005  MSc Anton Pristavec  Manufacturing technologies and systems  Researcher  2007  211 
4.  14335  PhD Rebeka Rudolf  Manufacturing technologies and systems  Researcher  2007 - 2009  1,084 
5.  09376  Viljem Šprah    Technical associate  2009  46 
6.  15682  PhD Tomaž Vuherer  Manufacturing technologies and systems  Researcher  2007 - 2009  512 
Organisations (1)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0795  University ob Maribor, Faculty of mechanical engineering  Maribor  5089638010  23,846 
Abstract
Accurate fatigue strengths are needed to assess the in-service fatigue life of dynamic loaded structural components. Mechanical parts or structures made from steel sheets are generally obtained by machining and cutting. In fact mechanical fatigue properties are strongly modified by the thermal cutting. Thermal cutting generates a typical shape edge with geometrical defects and structural changes that lead to a lowering in steel fatigue strength. The main aim of the present project is to investigate the fatigue properties modifications induced by the laser thermal cutting. The emphasis will be on establishing more accurate relationships between the cut edge quality/conditions and the fatigue strength. The purpose of this investigation is to experimentally determine fatigue properties of laser cut specimens of a wide range of sheet steels. Specimens manufactured through laser cutting will be fatigue tested both at constant and variable stress amplitudes. A model to predict fatigue strength will be developed using defect distribution measurements on the cut edges combined with linear elastic fracture mechanics.
Significance for science
Research results represent an extension of fundamental knowledge in the areas of: - New production technologies: Evaluation of the use of modern laser technology for producing dynamic loaded parts of the structure without further processing; - The discovery of basic scientific laws: Improved knowledge of the physical and numerical models to describe the fatigue mechanism of heat-cut edges and determine the parameters of fatigue (initiation and growth of short cracks); - The discovery of new scientific knowledge: Determination of influence quantities, which charaterise laser-cut edge with an emphasis on the use of high strength steel.
Significance for the country
For the co-financiers: For the co-financiers are the results of research projects directly usable. Control of design skills and technology to higher levels gives co-financiers greater weight and better opportunities to find business partners in the field of machinery. For Slovenia: Conducting research in the field of advanced manufacturing technologies for Slovenian companies, which produce metal structures and parts thereof, represents a strengthening of the identity of slovenian metal processing industry and increase its competitiveness in the market. Improved knowledge of the quality of laser cut components and the knowledge of their dynamic strength, allows users, designer / production engineers, to assess the durability of steel components and structures as a whole more efficiently and accurately, and thereby creating / producing a reliable, competitive and optimized structure.
Most important scientific results Annual report 2008, final report, complete report on dLib.si
Most important socioeconomically and culturally relevant results Annual report 2008, final report, complete report on dLib.si
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