A New Comparative Method to Evaluate the Fracture Properties of Laminated Composite

In this paper a new method to determine the fracture properties and strain energy release rate for carbon-polyester composite has been introduced. Fracture characteristics such as: critical stressintensity factor and critical strain energy release rate for mode I, mode II and mixed mode loading weredetermined using Arcan type specimen. 130 layers of carbon fiber polyester woven composite with each of 0.2mm thickness were put on each other. Theoretical studies to determine strain energy release rate were done using three methods: Corrected Beam Theory (CBT), Compliance Calibration Method(CCM), Virtual Crack Closure Technique (VCCT), and results were recorded and compared with the results from experimental and numerical attempts. Critical loads were recorded through experimental attempts then applied to the finite element software. Results were recorded and compared with eachother to determine the best method. Results show that CCM and VCCT determine strain energy releaserate value closer to J-integral in comparison with corrected beam theory. Finally, the fracture surfaces were examined by scanning electron microscope to gain insight intothe failure responses that shows the fracture surface for mode II is rougher than the fracture surface for mode I and mixed mode

کلیدواژه ها:

Arcan ، Fracture ، Lamination ، InterlaminarCrack ، Carbon- polyester Composite