Effect of Cure Cycle Anomalies on Mode-I and Mode-II Fracture Properties in Thermoset-based Carbon-Fiber Advanced Composite

Abstract

This study examines how cure cycle anomalies affect the fracture qualities of thermoset-based carbon fiber-reinforced composites in Mode-I (opening) and Mode-II (shearing). Advanced carbon fiber composites are essential for aerospace and automotive applications that require high strength to-weight ratios. The mechanical qualities of these composites depend on optimal cure cycles, which control temperature, pressure, and time. However, production errors, including under-cure, over-cure, and non-uniform heating, might affect the composite's fracture toughness and durability. After purposely producing cure cycle changes, the study examines composite specimens' Mode-I and Mode-II fracture toughness. Double cantilever beam (DCB) and end-notched flexure (ENF) tests analyze fracture qualities under controlled anomalous situations. A comparison of specimens cured with regular and different cycles shows how cure cycle irregularities affect fracture propagation, interlaminar strength, and matrix-dominated failure modes.