Effects of Some Injection Molding Process Parameters on Fiber Orientation Tensor of Short Glass Fiber Polystyrene Composites (SGF/PS)

Author:

SadAbadi Hamid1,Ghasemi Masood2

Affiliation:

1. Department of Mechanical Engineering, K.N. Toosi University of Technology No. 15, Pardis St., Molla Sadra Ave., Vanak Sq. Tehran, Iran - P.O. Box 19395-1999, ,

2. Department of Mechanical Engineering, K.N. Toosi University of Technology No. 15, Pardis St., Molla Sadra Ave., Vanak Sq. Tehran, Iran - P.O. Box 19395-1999

Abstract

Calculation of fiber orientation distribution is the reference standard for determining the numerous physical and mechanical properties of injection molded short fiber reinforced thermoplastics. On the other hand, most of the properties of these composites depend on their fiber orientation pattern, which can be represented by tensorial notation, aij. This work focuses on numerical calculation of a fiber orientation tensor of an injection molded short glass fiber polystyrene (SGF-PS) composite part, shaped as a rectangular plate. In this study, the effects of some parameters of the injection molding process including injection flow rate, mold wall temprature, packing pressure and also fiber content on the changes of fiber orientations of this specimen are investigated. Our studies are concentrated on determining the changes of the first orientation tensor component in the flow direction due to different injection parameters. In addition, the changes on tensile modulus of the injected part are simulated in every condition. The simulations show how these molding parameters can influence both fiber orientation and tensile modulus of injection molded parts. At the first step, in order to be confident about the software results, they are validated by experimental data in two cases.

Publisher

SAGE Publications

Subject

Materials Chemistry,Polymers and Plastics,Mechanical Engineering,Mechanics of Materials,Ceramics and Composites

Reference23 articles.

1. Karger-Kocsis, J. (1995). Polypropylene Structure, Blends, and Composites , 1st edn, Vol. 3, pp. 113—141, Chapman and Hall, London.

2. Mascia, L. (1974). The Role of Additives in Plastics, 1st edn, Chap. 3, pp. 44—104, Arnold.

3. The Use of Tensors to Describe and Predict Fiber Orientation in Short Fiber Composites

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