Optimized fixture design for precision machining of tensile specimens in hybrid composites

Abstract

Although CNC machines offer numerous advantages, machining hybrid composites presents unique challenges, particularly in the proper positioning and securing of tensile specimens during the process. These materials, often comprising layers of different types, can behave unpredictably under cutting forces, complicating the task of achieving precise, standard-compliant shapes. This study introduces a specialized machining fixture developed to securely hold and manipulate tensile specimens for composite testing, meeting the stringent requirements of academic research where dimensional precision is paramount. The fixture's design features robust clamping mechanisms that stabilize various specimen geometries, ensuring minimal distortion and precise alignment during CNC machining. The fabrication process included careful material selection and the application of advanced machining techniques to achieve exceptional dimensional accuracy. Performance evaluation through machining trials assessed factors such as clamping force, stability, and usability. Results demonstrate that the proposed fixture significantly enhances machining efficiency and accuracy, thereby improving the reliability of composite material testing.