This instruction manual is one in a sequence containing simple details and basic information valuable within the layout and improvement of military materiel and platforms. The handbooks are ready for the particular use of the layout engineers and medical body of workers within the executive and engaged within the layout, improvement, and upgrading of military gear, materiel, elements, and methods. This 1975 guide offers with a particular classification of fiber bolstered plastics/composites. The composites hide a large variety of actual houses. The composites disguise a large diversity of actual houses. They comprise the continual fiber strengthened fabrics that experience awfully excessive strengths and moduli of elasticity. the quick discontinuous fiber strengthened composites, which contain the subject material of this guide, are at a decrease power point. it's the goal of this ebook to acquaint military team 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.
Content:
• entrance topic
• record of Illustrations
• checklist of Tables
• Preface
• desk of Contents
1. advent
2. Thermoset Molding Compounds
three. fabric houses
four. power and Stiffness of brief Fiber Composites
five. Molding brief Fiber Thermosets
Appendix A: army and Federal standards
Index
Read or Download Engineering Design Handbook - Short Fiber Plastic Base Composites PDF
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Extra info for Engineering Design Handbook - Short Fiber Plastic Base Composites
Sample text
This table also provides some indication of the electrical properties with these materials. Fig. 3-6 summarizes the results of fatigue tests for polyester-mat laminates. 5 PROPERTIES OF WOVEN FABRICS WITH POLYESTER RESIN Table 3-4 and Figs. 3-7 through 3-13 summarize the mechanical properties of laminates made from a style 7781 woven glass fabric preimpregnated with a polyester resin, and cured by the vacuum bag-autoclave TABLE 34 PROPOSED REQUIREMENTS FOR A GENERAL PURPOSE SHEET MOLDING COMPOUND Class Glass Conwnt, wt, % Tensile Strength ksi, min Flexural Strength ksi, min lmpact Strength, lzod ft-lblin.
2-6 MISCELLANEOUS MATERIAL PROCESSES Two processes for preparing short-fiber moldings are briefly noted. One, open-mold spmy-up, is an older method that-is still used extensively, particularly in boat constryction. The other, cold press molding, is a more recent innovation that is gaining acceptance for low cost, short run applications. Both processes use fiberglass roving with polyester resin. In open-mold spray-up the fiberglass is chopped from roving and codeposited with resin into a mold. The mixture is compacted by hand rollers and cured at room temperature.
Material flow properties are controlled by the degree of B-staging. Optimum fiber contents are from 50 to 55 percent by volume for fiberglass and from 55 to 60 percent for graphite fibers. The shelf life for most finished compounds is in the order of six months. In some cases, refrigerated storage is required. The main advantages of chopped roving compounds are : (1) High strength to weight and modulus to weight ratios are possible. (2) Properties are more predictable due to closer controlled resin to reinforcement ratios.
