Investigation of stress concentration factor for natural composite material

In this study, the natural composite materials consisting o2f polyester and palm leaves were used by weight fraction 25%, where the mechanical properties were tested (tensile test) for natural composite materials. Five groups of samples were tested, some of them containing a U-notch and a section containing circular hole with different dimensions and the other section without anything. After the test found that the work of U-notch or a hole in the samples reduced the value of the peak stress for the material and therefore leads to increased stress concentration factor (SCF), Where the results showed the max value of stress recorded for the specimen which has U-notch in one side G2 where the max stress equal 300Mpa, while the test specimen which has circular hole 2mm diameter G5 recorded less stress value about 160Mpa.