Abstract: With the development of three-dimensional braided technology, three-dimensional braided structures have developed from the initial three-dimensional four-directional structure to three-dimensional five-directional, six- directional and seven-directional structures. At present, the high-temperature off-axial loading performance of three-dimensional six-directional and seven-directional braided composites remains to be further studied. This article is based on the development of a certain three-dimensional six-directional braided composite component, braids three-dimensional six-directional braided preform by using T800HB-12K carbon fiber. The composite part was prepared by RTM process with TDE-85 resin system as matrix. The internal quality of the composite part was detected by industrial CT, and the study on sixoff-axis loading tests of three-dimensional six-directional braided composite components at room temperature and high temperature were carried out. The results show that the three-dimensional six-directional braided composite part still have excellent in-plane properties at a high temperature of 105 ℃, but the off-axis loading performance declined comparing to room temperature conditions. The ultimate load under AY working condition can reach at least 150% design load due to the high integrity of its own structure.

Key words: three-dimensional six-directional braid, CT, high temperature off-axis loading tests, composites