Abstract
•Review of fracture toughness modeling of Carbon fiber reinforced polymers.•Linear and exponential Cohesive laws.•Analytical modeling for longitudinal fracture toughness of carbon fiber reinforced polymers.•Comparative study of the present analytical model with anther published one.
Carbon fibre reinforced polymer laminates (CFRPs) are widely used in the aerospace industry. However, the longitudinal fracture toughness of this composite material is a major factor that causes its failure. Here, physical linear and exponential softening laws are used to predict the fracture toughness of CFRPs. The model estimates the predicted strength of an open hole specimen of the material by using the cohesive law and the limiting value of the critical crack opening and unnotched strength obtained using a simple tension test. The critical crack opening is calculated based on a thickness formula. The model results are in good agreement with the experimental results, with errors of 6.39% and 11.29% for the linear and exponential cohesive laws, respectively.