ABSTRACT
Compression after impact tests of conventional CF/Epoxy were conducted in order to clarify the mechanism appearing during the tests and to compare the results based on two standard test methods (SACMA and NASA). Focuses in the mechanism are placed on in-plane strain distribution before and after local buckling, and relation between local buckling and the final failure. Test results through the two methods were compared in detail and it is revealed that the effective diameter of accumulated delamination is the most appropriate parameter to identify a global trend over wide range of impact energy when a complicated three-dimensional delamination shape was observed. It is also revealed that difference in CAI behavior originated from the two methods in lower impact energy is minimized if a diameter of a major cylindrical portion of delamination is adopted for data reduction instead of the effective diameter. In higher impact energy cases, no difference can be found due to the two methods.
