This study presents an improved VOIGT law based model which incorporates the surface tension between filler and matrix material. VOIGT law based models require perfect adhesion between fibers and plastic material, which not always occurs. This study deals with the adhesive bonding conditions between matrix and fibers. The harmonic arithmetic mean equation of surface tension by WU is incorporated into a VOIGT law based model. For the experimental validation of this model different fiber reinforced compounds and test specimens are produced. Young’s modulus, tensile strength as well as fiber length, orientations and surface tensions are measured.

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