Mechanical Properties of Experimentally Calculated Carbon Fiber

Abstract

Due to the expansion in the use of composite materials in various industries, also they are widely used in biomechanics, especially in the manufacture of prosthetics. Therefore, in this paper, four-layer carbon fiber material with lamination resin will be used to manufacture carbon fiber mold by experimental vacuum method, then the mold is cut with CNC machine to obtain the required samples for tensile test and fatigue test. Whereas, the tensile examination of the samples is to know the mechanical properties of the composite material such as Young’s modulus, ultimate stress and yield stress, while the fatigue examination of the samples is to extract the relationship between the number of life cycles and stress, which is called the S-N curve. These properties and specifications are compared with previous research that used the same composite materials in the manufacture of samples. It was found that the results of this work have good specifications due to the accuracy in the casting process using completely vacuum, the care in paving carbon fibers and the use of materials of internationally approved origins that improved the mechanical properties of the samples. The mechanical properties were calculated and the Young’s modulus = 20 GPa and the ultimate stress = 212 MPa. Also, an increase in the number of life cycles of applied stress was observed, as will be noted in the S-N curve, so composite materials (carbon fiber + lamination resin) can be used in the manufacture of prosthesis limbs, especially prosthesis feet because of their good properties and specifications.