<![CDATA[This aim of the study was to analyze the natural frequency ( n ) of fiberglass reinforced polymer composite beams. The study used the finite element method for numerical analysis. For the numerical analysis, the beam was divided into 5 elements. The supports used were a cantilever with the material of fiberglass reinforced polymer composite in the form of beam with length of 1 m, width of 0.03 m, and thickness of 0.02 m. Composite material consisted of two compositions, i.e : 5% fiber glass and 95% matrix epoxy; 20% fiber glass and 80 % matrix epoxy. The devices used in the study was a computer with matlab program. The results of the study for natural frequency analysis with 5% fiberglass: nmax = 23334 rpm, nmin = 2625 rpm, whereas with 20% fiberglass: nmax = 34033 rpm, nmin = 3829 rpm. The value of natural frequency ( n ) obtained 20 % fiberglass was greater than the value obtained 5% fiberglass.]]>
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