[PDF][PDF] Low cost manufacturing of textile composites using Vacuum Assisted Resin Transfer Molding

AD Kelkar, JS Tate - Journal of Manufacturing Technology & …, 2004 - researchgate.net
Journal of Manufacturing Technology & Research, 2004researchgate.net
Woven composites have good properties in mutually orthogonal directions; more balanced
properties than unidirectional laminates and have better impact resistance. The use of these
composites for primary structural applications in place of conventional laminated composites
has increased considerably in the recent years. They are being manufactured using new
process called as Vacuum Assisted Resin Transfer Molding (VARTM). This new process is
low cost, affordable and suitable for high volume manufacturing environment. VARTM is a …
Abstract
Woven composites have good properties in mutually orthogonal directions; more balanced properties than unidirectional laminates and have better impact resistance. The use of these composites for primary structural applications in place of conventional laminated composites has increased considerably in the recent years. They are being manufactured using new process called as Vacuum Assisted Resin Transfer Molding (VARTM). This new process is low cost, affordable and suitable for high volume manufacturing environment. VARTM is a single sided tooling process where the dry preform is placed into the tool and vacuum bagged in conjunction with resin injection and resin ejection lines. A low viscosity resin is drawn into the preform through the aid of vacuum. As is illustrated in the current work, thin, moderately thick and thick woven and braided preforms are processed using this method with rapid fill times. This technique holds promise to minimize processing costs and is adaptable for very large, complex shaped parts as well. It has less environmental concerns, as it is closed system. It also gives higher fiber volume fraction than hand layup. In VARTM process, the flow of resin occurs in plane as well as in the transverse directions to the preform. The permeability of the preform, fiber architecture and fabric crimp has an influence on the wetting of the fabric. There are number of weaves and different braiding forms that are being considered for the structural applications. The different weaves include plain weave, twill weave, satin weave and eightharness weave. The braids are available in two different forms tubes or sleevings and flat braids, and two different architectures biaxial and triaxial. The popular weaves are plain and twill weaves due to the low cost and balanced inplane and flexural properties. The popular braids are 2 x 2 biaxial braid sleevings because of it natural conformability to take exact shape of the nonlinear and irregular cross section components. This paper presents overview of the low cost VARTM manufactured composites.
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