14. starptautiskā konference 2012 - Latvijas Jūras akadēmija

Proceedings of 14th International conference „Maritime Transport and Infrastructure - 2012”Fig. 1. The view of a blade covering fragment from outside blade "bottom": a zone of the adhesivedestruction of a glutinous connection (it is designated by a dotted line). Shooters show zones of a film of glueVK-3, sharply differing among them on colour:1 – site of glue of dark brown colour, 2 – site of glue of light brown colourOne of IAC recommendations was the following: ” The Designer and the Manufacturer ofblades must develop modern, more effective quality monitoring of a condition of blades, including thedurability control of stuck coupling together blades surfaces, with application of the devices allowingprecisely to define presence starved spots and the beginning of glutinous connections destruction.”As shows the analysis of the collapsed blades with similar defects in 2009 year, themanufacturing technology of these blades haven't been broken by the Manufacturer in Plant. Thereforean origin of such defects to define is rather problematic. Incoming inspection of these blades haverealized to the full extent, provided by Technical Requirements. So, for the reasons specified above, itis impossible to define the given defect, which is connected with a chemical compound of a glutinouslayer, in the manufacturing conditions of the blade.Additionally it is necessary to note, that ultrasonic methods is not effective for operativecontrol to detect the defects of starved spot type in composite materials designs as its demand fullscanning the area of design elements and possess enough low sensitivity.Take into account that the wide application of composite materials in the transport design allthe time call for the simple, technological and cheap control methods to detect such defects as starvedspot and stratification. So a method of the acoustic emission during thermo loading has been offered asthe non-destructive monitoring of composite materials designs.Test ProcedureThe specimens of the composite material design elements with defects and without ones havebeen chosen for testing under thermo loading.The specimens have been cut out off the faultless covering of elevator (heat thermo loading).In one specimen artificial defects have been created, but at the same another one would remainfaultless (Fig. 2). Also a full scale aileron with defect was loading by high temperature to detect thisfault in the construction. The same full-size aileron made of composite material was chosen for coldtreatment loading.46