Effect of Tightening Torque on Bearing Performance of Kevlar Fiber Composite Bolted Joints Produced by Additive Manufacturing

The chapter investigates the effect of tightening torque on the bearing performance of Kevlar fiber composite bolted joints produced by Additive Manufacturing. It begins by discussing the critical importance of the pin bearing test in evaluating material performance under concentrated loading conditions. The study focuses on the bolt bearing test, which is crucial in structural and mechanical engineering for assessing the bearing capacity of materials. The research involves producing samples using a Markforged Mark 2 3D printer, with two types of samples: full Onyx and Onyx reinforced with Kevlar fiber. The mechanical properties of these samples are evaluated under two torque values, 5 Nm and 15 Nm, using a testing machine. The results show that the presence of Kevlar significantly increases the maximum force value but also makes the specimen more brittle. Statistical analysis reveals the influence of material, torque, and trend on the measured output values. The chapter provides a comprehensive analysis of the failure mechanisms and performance of these composite materials under different torque conditions, offering valuable insights for optimizing material usage and design in various engineering applications.