CFRP直交積層材の層内樹脂割れ損傷の進展挙動観察

抄録

CFRP has a laminated structure not found in general metal materials such as aluminum alloys, and anisotropy due to them. Furthermore, there are various kinds of damage generated, and they can be roughly divided into three types of transverse crack, delamination, fiber breaking, but damage occurs only inside the material in each damage. As a result, there are also injuries that cannot be detected from the outside visually, so it is difficult to evaluate them. In this study, a tensile test was carried out on CFRP cross-ply symmetrically laminated materials of laminated construction in which the thickness was constant and the ratio of the 0 ° layer and the 90 ° layer was changed, observe the occurrence of damage from the measurement of events at the time of damage introduction by AE, furthermore, focusing on transverse cracks which occur as initial damage among various types of damage, the occurrence / progressive behavior of transverse cracking damage due to tensile load was evaluated from the side observation of specimen by digital microscope, the strain energy release rate by the finite element method (FEM) was compared and examined in each laminated structure by using the transverse crack density guided from there. As a result, the tendency of damage occurrence was confirmed by tensile test and AE test, from the crack ingenerate test, the tendency of occurrence and progress of transverse cracking in the layer was found. In the FEM, the strain energy release rate was obtained, and the tendency and change in each laminated structure could be found out.