Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (12): 178-184.doi: 10.13475/j.fzxb.20190806607

• Academic Salon Column for New Insight of Textile Science and Technology: Preparation Technology and • Previous Articles    

Control method and technology of resin injection for resin transfer molding in manufacturing of composite materials

ZHANG Guoli1,2,3(), ZHANG Ce1,2,3, SHI Xiaoping1,2,3, WANG Zhipeng1,2,3, JIANG Qian1,2,3   

  1. 1. School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
    2. Institute of Composite Materials, Tiangong University, Tianjin 300387, China
    3. Key Laboratory of Advanced Textile Composites, Ministry of Education, Tiangong University, Tianjin 300387, China
  • Received:2019-08-26 Revised:2019-10-12 Online:2019-12-15 Published:2019-12-18

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Abstract:

Aiming at the problem of bubbles or dry spots caused by incapability of completely removing local air or completely impregnating the effective area by resin in the resin injection for resin transfer molding (RTM), the mechanism of bubble wrapping and dry spot formation in RTM forming process was systematically analyzed. The influence of non-deterministic factors in RTM molding process on the flow quality of RTM resin injection was summarized and introduced, such as the regional distribution difference of preform permeability, the difference in interleaving law of preform yarn bundle, the difference in size of preform and cavity, the difference in number of inlet and outlet positions of RTM mould and the difference in requirements, and the new technologies and methods for regulating the flow shape of resin were put forward. Finally, the simulation of RTM resin flow process for T-type composite structural products was carried out, which provides a theoretical and method reference for the development of new RTM injection technology for composite materials with complicated structures.

Key words: resin transfer molding, composite, bubble, dry spot, defect formation mechanism, control method

CLC Number: 

  • TB332

Fig.1

Injection situation of B-pillar part of automobile bottom. (a) Thickness of different zones; (b) Picture after resin injection"

Fig.2

Resin flow types. (a) Unidirectional flow; (b) 2-D in-plane flow; (c) 3-D macroscopic flow"

Fig.3

Dry spot due to race-tracking effect"

Fig.4

Injection situation of front part of Car. (a) Position of inlet and outlet; (b) Position of dry spot"

Fig.5

Simulation cases. (a) Injection position of case 1; (b) Injection position of case 2; (c) Injection position of case 3; (d) Dry spot position of case 1; (e) Dry spot position of case 2; (f) Dry spot position of case 3"

Fig.6

Schematic diagram of local adjustable cavity height. (a) Increase height of injection cavity; (b) Cavity lock and curing"

Fig.7

Schematic diagram of resin injection of local wet molding coupling with RTM"

Fig.8

Comparison between single gate injection (a) and multiple gates progressive injection (b)"

Fig.9

T-shaped composite structural parts"

Fig.10

Simulation cases of T-type composite. (a) Injection time of case 1; (b) Injection time of case 2; (c) Injection time of case 3; (d) Injection pressure of case 1; (e) Injection pressure of case 2; (f) Injection pressure of case 3"

Fig.11

Schematic diagram of resin injection mold"

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