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Effect of vacuum assistance on the void formation during liquid composite molding process

Name
Eduard
Surname
Batyrshin
Scientific organization
Center for micro- and nanoscale dynamics of dispersed systems, Bashkir State University, Ufa
Academic degree
Ph.D.
Position
Researcher
Scientific discipline
New materials, Manufacturing technologies & Processes
Topic
Effect of vacuum assistance on the void formation during liquid composite molding process
Abstract
Effect of vacuum assistance during the impregnation stage of the liquid composite molding process on the void formation was experimentally studied. The dependence of the void content on the vacuum pressure was obtained. A model describing the results and the outlook were proposed.
Keywords
composites, liquid composite molding, voids
Summary

Effect of vacuum assistance on the void formation during liquid composite molding process

 

E.S. Batyrshin1, A.I. Mullayanov1,  I.S. Akhatov2 and I.V. Sergeichev2

1Center for micro- and nanoscale dynamics of dispersed systems, Bashkir State University, Ufa, Russia

d134cdbbatyrshine@mail.ru

2Skoltech Center for Design, Manufacturing and Materials, Skolkovo Institute of Science and Technology, Skolkovo, Moscow Region, Russia

(poster presentation)

Void formation during liquid composite molding (LCM) process is one of the challenges in manufacturing of composite parts. Voids significantly degrade shear and compression strength of composites. LCM involves the pressure gradient driven injection of liquid resin into the closed mold containing reinforcing fibers. Complex porous structure of the reinforcement can provide the gas entrapment and the formation of voids during the impregnation stage.

The effect of vacuum assistance to drive the resin flow on the void formation was experimentally studied. The transparent mold made of acrylic glass containing single layer of reinforcing fabric was used to simulate the LCM process. The designed mold allowed applying vacuum and compressed air pressure to inject the epoxy resin into the mold. The saturation curves were obtained at various applied vacuum pressure. The pressure gradient between the inlet and the outlet of the mold was keeping constant during all experimental tests. The volume fraction of voids in fabricated samples was estimated by facilities of optical microscopy and image processing techniques. The dependence of the void content on the vacuum pressure was obtained. A model for description of the obtained results and the outlook were proposed.

This work was supported by Grant of Ministry of Education and Science of the Russian Federation (11.G34.31.0040) and Skoltech Partnership Program.