EFFECT ON BELTED GLASS ROVING AROUND THE MOUNTING BUSHING ON THE STATIC STRENGTH OF ROTOR BLADE SPAR
Journal Title: Prace Instytutu Lotnictwa - Year 2016, Vol 244, Issue 3
Abstract
The article describes the test and analysis using Finite Element Method (FEM) to verify the legitimacy of the coefficient of allowable stress in place winding glass roving, for example bushing at the base of the rotor blades of the helicopter.For test was designed symmetrical sample of two roving belted bushing in order to ensure correct operation of the system. In the computational part of the test used a software MSC PATRAN 2014.1 and MSC NASTRAN 2014.1.The test was a static stretching of the sample in its longitudinal axis until failure of the sample. Three samples were tested, labeled S1-S, S-S-S2 and S3. For samples achieved force, respectively: 139.8 kN, 133.3 kN and 146.4 kN averaged value is 139.8 kN. Experimental results of the test are similar to the expected breaking force (corrected for k=1.396) of 143.3 kN. The difference ranges from 2 % (sample S-S3) to 7 % (sample S-S2). All samples were broken at the transition of straight in the bushing.The tension in the roving was checked by FEM calculation by applying a load equal to 140 kN corresponding to approximately the force determined in the experimental test. Analysis showed that in the case of not taking account of the safety factor k the maximum stress in the specimen do not exceed the allowable stress. If a coefficient k=1.396 is in used, stresses around the bushing exceed the allowable stress. In addition, the highest stresses in the sample are present in the transition zone of the rectilinear portion of the wrapper which coincides with the destinations cracks samples.The conducted analysis confirmed the validity of the use and method of calculation of lowering tensile strength in roving in wrappers.<br/><br/>
Authors and Affiliations
Radosław Guzikowski
Keywords
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- EP ID EP186114
- DOI 10.5604/05096669.1222740
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