This paper describes experimental investigations on the in-plane tensile properties of unidirectional carbon-fibre/epoxy laminates reinforced with circumferentially notched z-pins with different notch designs. From the results it can be concluded that the application of circumferential notches at the z-pin surface with constant notch depth of 20 μm and distance of 100 μm has no significant effect on the in-plane tensile strength values, regardless of the notch designs investigated. For circular and rectangular notch designs, no dependence of the tensile strength from the notch depth could be observed. Only changing the notch distances at a constant notch depth and width leads to small increases in the tensile strength values with increasing notch distance. The determined tensile modulus values indicate that there are no substantial deviations between laminates reinforced with unnotched and circumferentially notched z-pins, no matter which notch design is considered. It can be observed that there are no dependencies of the tensile modulus from notch depth and distance. Therefore, it can be assumed that the microstructural changes influencing the in-plane tensile properties will not be changed, or only to a very small extent, by the presence of notches on the pin surface.
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