Resin tranfer moulding in composite materials

About resin transfer moulding used in composite materials.

1. END SEMESTER SEMINAR PRESENTATION ON RESIN TRANSFER MOULDING PRESENTED BY: INDRA MOHAN (ROLL NO. :-1935010) M.Tech. PRODUCTION ENGG. SESSION 2019-21 (DATE-24JULY,2020) MECHANICAL ENGINEERING DEPARTMENT NATIONAL INSTITUTE OF TECHNOLOGY PATNA-800005

2. CONTENTS Introduction Raw materials Procedure Process Components Application Advantage Disadvantage Conclusion Refrences

3. INTRODUCTION Resin transfer moulding process was developed by US navy in 1946 and made a personal boat. Resin transfer molding is a process in which fiber preform or dry fiber reinforcement is packed into a mold cavity that has the shape of the desired part and then supply the matrix material to form the product. Resin transfer molding is a closed molding process. It is also known as liquid transfer molding process. Molding unit has two halves namely upper half mold (core) and lower half mold(cavity). In this technique, resin is transferred over the already placed reinforcement.

4. R AW MATERIALS Reinforcing materials :- Glass fiber, carbon fiber, aramid fiber, natural plant fibers,(sisal, banana etc.) Matrix :- T hermosets :- Epoxy resin, polyester, polyvinyl ester, phenolic resin, polyurethane resin, silicone, thermoset polyamides. Thermoplastics :- Nylon, Styrene resin, Thermoplastic polyester,Liquid crystal polymers.

5. R ESIN TRANSFER MOULDING PROCESS(RTM) Reinforcement in terms of either woven mat or strand mat form is placed on the surface of lower half mold. A gel is applied on the mold surface for easy removal of the composite. The mold is properly closed and the mold halves clamped together. The resin is pumped until a predetermined volume has been delivered into the mold. Air i s disp l aced th r ough vent s . The unifor m i t y of r es i n flow can be enhanc e d by using a ca t aly s t as an acce l era t or and vacuum applicat i on. A f ter curing, the m old i s opened and co m posite product is taken out.

6. CONT…. There are two separ a te cont a iners for re s in and ca t aly s t . Resin cont a iner is la r ger than the ca t al y st conta i ne r . Pu m ping unit t r ansfers the res i n and ca t aly s t to the m ix i ng cha m be r . Resin and cata l yst is m ixed properly in the m ixing cha m be r . Resin injector is used to inject the mixture to the mold cavity. Heating arrangement is integrated with molding unit. Vents are provided to release the gases in the mold cavity during clamping. End of process, the molding unit is opened and the product ejected.

7. C OMPONENTS Resin and ca t aly s t cont a iner Pu m ping unit Mixing cha m ber Resin in j ec t or Upper mould Lower mould fig: resin transfer moulding

8. A DVANTAGES Good s urface finish on both surface of t he product . Desigh flexibility Fast cyc l e t i m e can be ach i eved th r ough te m peratu r e cont r ol devi c e. Higher product i on ra t e is associated with process auto m at i on. The process does not requi r e high in j ec t i o n pressu r e. Process can be manual control, semi-automatic or highly automated Low capital investment

9. D ISADVANTAGES Complex moulds. T ol l ing cost is expans i ve. There is li m itation on reinforcing m ate r ia l s due to the f low and res i n sa t uration of fibe r s. Mold m ain t enance cost is high . It p roduce s higher volu m e waste .

10. A PPLICATION C o m plex st r uctu r e can be produce d . Auto m ot i ve body parts, big cont a ine r s, bath t ubs, hel m et etc. V ehic l e panels Boat hul l s. W ind tu r bine blad e s. Truck panels Aerospace parts.

11. CONCLUSION Resin transfer moulding(RTM) has good design flexibility. RTM is faster process. RTM having good dimensional tolerence. RTM having short production cycle. Very efficient process.

12. REFRENCES Front. Mater.Sci,China 2010,4(2):217-224 DOI 10.1007/s11706-010-0028-x Department of plasticity technology,shanghai jiao tong university,shanghai 200030,China. Analysis and performance of fiber composites written by Bhagwan D Agarwal, Lawrence J Broutman ,K.Chandrashekhra. Mechanics of composite materials written bt Kaw Autar K Google Sources

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