Investigation of fatigue behavior of woven composite materials in various parameters

In recent years, the importance of nanoparticles, which are high-tech products, has been increasing. Nanoparticles are used in many fields as well as in the field of composite materials. One of the new application areas for composites in recent years is the construction sector. The special requirements in this industry offer many opportunities. The most important feature of composites consisting of a combination of glass and carbon fiber resin is the capacity to produce endless new materials according to the quality of the selected material. In this study, woven type composite materials produced with 5 different layer structures without nanoparticle reinforcement and with different ratios by mass (0.5%, 1% and 3%) with Al2O3, CuO and MgO nanoparticle reinforcement were subjected to fatigue tests. Before starting the fatigue tests, pieces of 40x25mm were attached to the ends of the composite materials so that the samples were only subjected to loads in the tensile and compression direction and not affected by bending moment. Fatigue tests were carried out with a Shimadzu Servo-Hydraulic Fatigue Tester with 100 kN load cell in the Laboratory of the Mechanical Engineering Department of Batman University. In order to determine the fatigue limits of the samples, fatigue tests were carried out by applying R=-0.1 load ratio, 6 Hz frequency and sine wave load. After fatigue tests, Load level (%) – Cycle number (N) diagrams, damping ratios and hysteresis loops of woven type composite materials produced with and without nanoparticle reinforcement were examined and the results were interpreted. In addition, SEM (Scanning Electron Microscope) analyzes of damage mechanisms in woven composite materials were investigated. The highest fatigue cycles and damping ratios were determined in woven composites with KM-3 stacking sequence. Woven composites recommended for production were samples with KM-3 stacking sequence. Since generally symmetrical hysteresis curves occured in woven composite materials produced with and without nanoparticle reinforcement, the deformation behavior was thought to be linear elastic.