This instruction manual is one in a chain containing uncomplicated info and basic facts worthy within the layout and improvement of military materiel and platforms. The handbooks are ready for the targeted use of the layout engineers and medical body of workers within the executive and engaged within the layout, improvement, and upgrading of military apparatus, materiel, elements, and methods. This 1975 guide bargains with a selected category of fiber strengthened plastics/composites. The composites hide a wide diversity of actual houses. The composites disguise a large variety of actual houses. They comprise the continual fiber bolstered fabrics that experience incredibly excessive strengths and moduli of elasticity. the fast discontinuous fiber strengthened composites, which contain the subject material of this instruction manual, are at a decrease power point. it's the goal of this publication to acquaint military body of workers with the features of those fabrics. Emphasis is put on the shut dating among fabric homes and the linked strategies for fabricating those fabrics.
record of Illustrations
checklist of Tables
desk of Contents
2. Thermoset Molding Compounds
three. fabric homes
four. energy and Stiffness of brief Fiber Composites
five. Molding brief Fiber Thermosets
Appendix A: army and Federal standards
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Extra resources for Engineering Design Handbook - Short Fiber Plastic Base Composites
Fibers can be placed in selected areas for increased reinforcement or for variations in section thicknesses. Fiber lengths are variable and normally are from 1 to 2 in. 2 PLENUM CHAMBER PREFORMING The glass chopping and spraying is conducted in an enclosed housing. The glass is deposited by a blower system onto the preform screen. A roving chopper is mounted at the top of the chamber while binder spray heads are located around the periphery to cover the screen. Several versions are employed such as a single station plenum chamber, shuttle, self-curing shuttle, and automatic rotary types.
In general, formulation optimizations represent a compromise for moderate strength at lowest cost. Specific material characteristics may require optimization at some other ratios of fiber, filler, and resin. It is, therefore, useful to ascertain the effects of these variables on various properties. Such data are provided wherever available. Significant influences on property values, reproducibility, and reliability result from variations in material manufacturing processes, maturation rates of chemically thickened resin systems, storage life prior to molding, and in the molding operation.
In situations where design allowables are required, it is necessary to conduct tests for determining property values and the associated standard deviations. Procedures for obtaining such information are furnished in MIL-HDBK-17A, Plastics for Aerospace Vehicles, Part I , Reinforced Plastics. Nearly all physical properties will vary depending on the types of proportions of reinforcing fibers, fillers, and resins. Mechanical properties also are influenced by the length of fiber reinforcement. In general, formulation optimizations represent a compromise for moderate strength at lowest cost.