Initiation and Propagation of Cracks in Notched Unidirectional Laminates of Carbon Fiber Reinforced Epoxy under Static Tensile Load

摘要

For tension loading, matrix splitting was tested on notched rectangular specimens of unidirectional carbon fiber-reinforced epoxy T300-914C. Crack propagation, notch opening displacements, and specimen elongation were measured in dependence on tensile force. Crack behavior was analyzed by acoustic emission measurements, X-ray, ultrasonic and REM-photographs. Analytical methods, based on linear fracture mechanics, were used to evaluate the stress intensity factors, the energy release rate, and its splitting for mode 1 and 2. The established interaction diagrams describe the crack initiation at the notch tip of unidirectional laminates.