Abstarct: Pipes are used in many industries such as aerospace, oil and gas, food and pharmaceutical industries. In many cases, these pipes are subjected to uniaxial compressive load, which causes buckling and bending of pipes.Cutouts can be caused by the impact of foreign bodies or factors such as rust. In these cases, the presence of these cutouts changes the stress distribution in the pipe and may significantly reduce their stability; Therefore, it is necessary that the buckling and bending behavior of these types of pipes is carefully analyzed and investigated. In this research, the experimental analysis of buckling and bending behavior of tubes with circular cutouts, reinforced with unidirectional glass fibers of 300 grams, containing nanoparticles has been done. For this purpose, 4000 series aluminum tubes with circular cutouts were prepared. The cutout tubes were reinforced by epoxy/glass fiber composite. In order to increase the mechanical properties of the reinforced sample against bending and compressive loads, and to increase the adhesion of the composite patch to the defective sample, clay nanoparticles with different weight percentages of 1%, 3% and 5% have been used. In order to verify the results of the results, the finite element method has been used in Abaqus software. The test of tubes with circular cutouts reinforced with unidirectional glass fibers showed that the best percentage of nanoclay addition to the composite patch is 1% in the buckling test and 3% in the bending test, which is 26% and 23% of the compressive strength and maximum bending load, respectively, compared to The reinforced tube is enhanced with a nanoparticle-free composite patch. Cutouts with fixed area, geometry and positions in the pipe have been used and the effect of these parameters on buckling and bending load has been investigated. It has been observed that the experimental results confirm well the finite element analysis results.