Evaluation of Silica Content on Fracture Toughness of PI/SiO2 Hybrid Films
The effect of silica content on plane-stress fracture toughness of Polyimide/silica (PI/SiO2) composite films was studied using the specific essential work of fracture (EWF) method. The specific essential and non-essential work of fracture for PI/SiO2 hybrid thin films with different silica doping levels was tested by experiment. The shape factor of the plastic region and specific non-essential work of fracture per unit volume were received by finite element (FE) calculation. It demonstrated that the plastic zone for specimens studied here was much different from the traditional result given through optical microscopic observation.
Yu Zhou, Shan-Tung Tu and Xishan Xie
Z. D. Wang and J.J. Lu, "Evaluation of Silica Content on Fracture Toughness of PI/SiO2 Hybrid Films ", Key Engineering Materials, Vols. 353-358, pp. 1814-1817, 2007