基于超声透射法的三维编织预制体面外渗透特性实验研究

Experimental research on transverse permeability characteristics of 3D woven preform based on ultrasonic transmission method

针对三维编织预制体的渗透特性,设计了基于超声透射原理的面外渗透率测试装置。通过对5种碳纤维预制体进行面外渗透率的测试,获得了液体在预制体的面外渗透规律。在流体注入初期,以面内渗透为主,渗透率计算值随液体注入时间增加而不断增大。注入一段时间之后,渗透率计算值趋于预成型体面外渗透率值。材料相同且织物结构相同的预成型体面外渗透率具有良好的一致性;6步结构的面外渗透率略大于8步结构的面外渗透率。织物结构相同,但材料不同的预成型体面外渗透率具有一定差异;材料为东丽T700的面外渗透率约是材料CCF800H的两倍。

Aiming at the permeability characteristics of the three-dimensional woven preform,we have designed a trans⁃verse-permeability testing device based on the principle of ultrasonic transmission.Five kinds of carbon fiber preform have been tested for the transverse permeability,and the liquid-transverse-permeability characteristics of the preforms have been obtained.In the initial stage of fluid injection,the transverse permeability is the main factor,and the calculat⁃ed permeability value increases with the increase of the fluid injection time.After a period of injection,the calculated permeability tends towards the transverse permeability value of the preform.The transverse permeability of the preforms with the same material and the same fabric structure has the good consistency;the transverse permeability of the 6-step structure is slightly greater than that of the 8-step structure.The fabric structure is the same,but the transverse permea⁃bility of preforms with different materials has a certain difference;the transverse permeability of the Toray T700 material is about twice than that of the material CCF800H.