Thesis Open Access

MECHANICAL BEHAVIOR AND VIBRATION ANALYSIS OF FIBER REINFORCED POLYMER COMPOSITE BEAMS USING NUMERICAL METHOD

NIGATU DESTA TILAHUN

Thesis supervisor(s)

Professor Hirpa G. Lemu; Hirpa G. Lemu, (PhD).,

In this study, the free and forced vibration analysis of fiber reinforced plastic (FRP)
composite beam using numerical method (finite element analysis) and mathematical
modeling using MATLAB are conducted. Mechanical and physical properties of FRP
are found using strength of material and semiempirical approach to get the equivalent
of those properties. The beam is configured as cantilever with dimensions of
191×33×5.66 mm3 for all analyses of vibrations. For modal analysis of vibrations
different effects such as fiber volume ratio, fiber materials, angle of orientation, and
stacking sequence of laminates are discussed. From these effects, stacking sequence of
laminates is more effective in varying stiffness and natural frequencies with unique
fiber volume ratio and same fiber material. Comparison of numerical and analytical
solutions of natural frequencies are most approached except in mode 2 or bending
mode in y axis. Forced vibration was carried out using the same configuration of beam
as modal analysis, but with different stacking sequence of layers with harmonically
exited loads. Results of resonance of vibration occur around the natural frequencies of
composite.
 

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