دراسة تأثير التقوية بالياف البورون و الياف الكفلر على مادة الايبوكسي و حساب بعض الخواص الميكانيكية للمتراكب الناتج من عملية التقوية

Abstract EN

In this studying , the fracture surface energy of epoxy reinforced by boron and Kevlar fibers are studied , by changing the normal applied stress on the parallel fibers at range between (2.5 - 4 GPa) , when the fiber diameter , fiber contents and shear stress are constant , and changing the fiber contents at range between ( 50-250 ) fibers when other parameters are constant .

The Young's modulus, density, of composite and specific strength are calculated for two specimens .

as well as , the weight ratio (volume of fraction ) of fibers are calculated at range (30%-70%) weight ratio by addition( 20% ) weight ratio for tow specimens .

The results of the fracture surfaces energy are presented that it increases by increasing the fiber contents , and applied stress at range between ( 2.5 – 4 GPa ), and decrease with increasing the Young's modulus .

In addition, the reinforced lead to composite with low density and density of composite is increase by increasing volume fraction of fibers for two specimens.

As well as , the specific strength is decrease with increasing volume fraction of fibers at range (30% - 70%) weight ratio when the applied stress is constant , and it increase with increasing applied stress .

In addition, the Young's modulus is greatest when the applied stress is parallel on fibers .