مرکز منطقه ای اطلاع رساني علوم و فناوري -

چكيده لاتين :

The effect of mechanical and physical properties of polymer matrices on stress amplification factors is studied in a composite monolayer. The lamina is subjected to an elliptical damaged zone of radii "a" and "b" while loaded at infinity by a force "P". The matrix takes both axial and shear loads. The ratio of alb is allowed to vary in a range of alb, to simulate almost a crack and a circular hole, for the two values of a 0 and a=b, respectively. Any reduction in stress amplification factor Kr, and peak shear stress in the matrix (Sxy)maxי appears to well depend on the value of matrix to fibre volume fraction VmlVf, and their mechanical properties, as well as shape and size of the hole, For polypropylene and epoxy matrices, at a/b« 0.5 and r= 5, increasing VmlVf from 0.5 to 2,0 decreases (Sxy)max by 62% and 73%, respectively, while Kr is decreased by 17%,