Axiomatic Design and Fabrication of Composite Structures: by Dai Gil Lee

By Dai Gil Lee

The concept fabrics should be designed to meet particular functionality necessities is comparatively new. With high-performance composites, besides the fact that, the whole strategy of designing and fabricating a component should be labored out ahead of production. the aim of this booklet is to provide an built-in method of the layout and production of goods from complex composites. It exhibits how the fundamental habit of composites and their constitutive relationships can be utilized in the course of the layout level, which minimizes the complexity of producing composite elements and decreases the repetitive "design-build-test" cycle. Designing it correct the 1st time goes to figure out the competitiveness of an organization, the reliability of the half, the robustness of fabrication strategies, and eventually, the fee and improvement time of composite elements. such a lot of all, it's going to extend using complicated composite elements in fields that use composites in simple terms to a constrained quantity at present. to accomplish those ambitions, this publication provides the layout and fabrication of novel composite elements made for laptop instruments and different functions like robots and automobiles.This publication is appropriate as a textbook for graduate classes within the layout and fabrication of composites. it is going to even be of curiosity to working towards engineers studying approximately composites and axiomatic design.A CD-ROM is incorporated in each replica of the booklet, containing Axiomatic CLPT software program. This application, built by way of the authors, will support readers in calculating fabric homes from the microstructure of the composite.This e-book is a part of the Oxford sequence on complex production.

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Additional resources for Axiomatic Design and Fabrication of Composite Structures: Applications in Robots, Machine Tools, and Automobiles (Oxford Series on Advanced Manufacturing)

Sample text

1 gives compositions of some commonly used glass fibers (Chawla, 1998). 0 — is a good electrical insulator in addition to having good strength and a moderate Young’s modulus. Most of the continuous glass fiber produced is E-glass type but, notwithstanding the designation E, electrical uses of E-glass fiber are only a small fraction of the total market. This glass is based on the eutectic ternary system CaO–Al2O3–SiO2, with some B2O3 substituting for SiO2 and some MgO for CaO. The B2O3 lowers the liquidus temperature substantially, giving a wider working temperature range and consequently making fiber manufacture by drawing easier.

There is another particular necessity that the diameter of the fiber should be small. During processing and fabrication or stacking, fibers should have enough flexibility, that is, the inverse of stiffness EI (E: elastic modulus, I: moment inertia of its crosssection). The elastic modulus of a material is normally independent of its form or size for a given composition and density. Therefore, the flexibility of a material is determined by the shape and size of the cross-section. 1) indicates that flexibility becomes very large as the fiber diameter becomes small.

Some kind of surface treatment such as cold gas (argon or ammonia) plasma must be given to the polyethylene fiber to bond with polymeric resins. Plasma consists of gas molecules in an excited state of dissociation. When polymers are treated with plasma, surface modification occurs by removal of any surface contaminants and highly oriented surface layers, or addition of polar and functional groups on the surface, and the introduction of surface roughness, which contribute to an enhanced fiber/matrix interfacial strength.

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