CORRELATION BETWEEN THE DAMPING FACTOR PER UNIT MASS AND THE FREE LENGTH FOR COMPOSITE SANDWICH BARS. EXPERIMENTAL INVESTIGATIONS

Cristian-Oliviu BURADA, Cosmin-Mihai MIRIŢOIU, Marius-Marinel STĂNESCU, Dumitru BOLCU
2015 Fiabilitate şi Durabilitate  
In this paper we have build some composite sandwich bars in this way: the core is made with polypropylene honeycomb (its thickness is 10, 15 and 20 mm) reinforced with 1 layer of carbon fiber (on the sample upper and lower sides). For these samples we have determined, by experimental means, the damping factor per unit mass and per unit length. Then, by using the regression analysis, we have established correlations between the damping factor per unit mass and the bars free length. In order to
more » ... ngth. In order to obtain these correlations, we have considered the next free lengths of the bars: 200, 230, 260, 290, 320, 350.
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