Abstract: In order to achieve the densification of the structure of the flexible guided three-dimensional weaving composite prefabricated component during the weaving process, a digital compaction system is used to study the compaction characteristics of the three-dimensional woven composite component, and the compaction displacement and compaction during the compaction process are measured and recorded. The relationship between the load and the spring-back of the component and the forming process parameters reveals the relationship between fiber volume fraction and compressive stress. It shows that the densification and compaction process of digital flexible oriented three-dimensional weaving composites can be divided into three stages:low-stress linear pre-compaction, non-linear transitional compaction and high-stress compaction, and the densification of the composite preform structure are established. The theoretical formula of the characteristic, in the process of compaction and densification, the components are subjected to pressure maintaining treatment, and the relationship between compaction load and holding time is analyzed. It shows that the compressibility of the flexible guided three-dimensional weaving components gradually decreases with the increase of the number of layers, the rebound amount and weaving. The number of layers is positively correlated, and the average fiber rebound per layer gradually decreases and tends to be stable.

Key words: composites parts, digital three-dimensional weaving, spring-back of preforms, Z-direction compaction