Abstract
Mixed-mode (mode I and mode II) interlaminar fracture toughness of unidirectionally reinforced and woven CFRP (Carbon Fiber Reinforced Plastic) is evaluated using DCB (double cantilever beam) specimens. A new testing apparatus is made in order to change the ratio of mode I to mode II in wide range. The fracture toughness value is evaluated based on beam theory, and the deformation of specimens is analyzed by the finite element method. The relation between compliance and clack length obtained by experiment agrees with the results obtained by FEM. The constant fracture toughness value, GC, which is independent of crack length, is obtained. Due to the decrease of the GI/GII ratio, the fracture toughness value increases. It is shown that the role of mode II changes largely due to the change of the ratio of mode I to mode II, though the mode I component keeps a nearly constant value.
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