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Damage of Bi-material Structures and Reinforced Composites with Different Industrial Applications

Journal of Sustainable Development of Energy, Water and Environment Systems
Volume 4, Issue 1, pp 23-37
DOI: http://dx.doi.org/10.13044/j.sdewes.2016.04.0003
Jordanka Ivanova1 , Varbinka Valeva1, Ana Yanakieva1, Tatyana Petrova2, Wilfried Becker3
1 Institite of Mechanics, BAS, Acad. G. Bonchev Str., bl. 4, 1113 Sofia, Bulgaria
2 Institite of Chemical Engineering, BAS, Acad. G. Bonchev Str., bl. 103, 1113 Sofia, Bulgaria
3 Technical University of Darmstadt, Karolinenplatz 5, 64289 Darmstadt, Germany

The present paper consists of two parts. In the first part the interface delamination of bi-material structures (unit cell of wind rotor blade) with different material properties under mechanical loading at physical conditions – electricity, temperature and moisture is under consideration. The investigation of the above mentioned structures are motivated by the importance for safety of devices used for energy industry applications. The second part is devoted to renovation of old buildings by using new and modern composite materials. The goal is to find via mathematical modelling the safety zone, the reliability of the structures considered and the detection of possible interface delamination as a function of geometrical, material and physical parameters as well as the pull-out force of modern composites used in building industry. The analysis provided in both parts is based on the modified shear lag method. The results obtained in the first and second parts of the paper are illustrated by tables and figures. Some recommendations and possible criterions are proposed, as well.

Keywords: Hygrothermalpiezoelectric bi-material structure, Interface delamination of wind turbine blade, Renovation of old buildings, Glass/carbon nanotube composite, Pull-out force.

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