TAILIEUCHUNG - Plastics Engineered Product Design 1 Episode 9

Tham khảo tài liệu 'plastics engineered product design 1 episode 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 300 Plastics Engineered Product Design Figure Schematic of strip hybrids UNIDIRECTIONAL COMPOSITE STRIP RANDOM 1 1 1 1-4 Ft -rt II II h-i-T-l 4. --H I I II II II l-J 1_I RANDOM RANDOM ONE WAY STRIPS TWO WAY STRIPS they may be used jointly to satisfy two or more design requirements simultaneously for example frequency and impact resistance. Comparable plots can be generated for other structural components such as plates or shells. Also plots can be developed for other behavior variables local deformation stress concentration and stress intensity factors and or other design variables different composite systems . This procedure can be formalized and embedded within a structural synthesis capability to permit optimum designs of intraply hybrid composites based on constituent fibers and matrices. Low-cost stiff lightweight structural panels can be made by embedding strips of advanced unidirectional composite UDC in selected locations in inexpensive random composites. For example advanced composite strips from high modulus graphite resin intermediate graphite modulus resin and Keviar-49 resin can be embedded in planar random E-glass resin composite. Schematics showing two possible locations of advanced UDC strips in a random composite are shown in Fig. to illustrate the concept. It is important to note that the embedded strips do not increase either the thickness or the weight of the composite. However the strips increase the cost. It is important that the amount type and location of the strip reinforcement be used judiciously. The determination of all of these is part of the design and analysis procedures. These procedures would require composite mechanics and advanced analyses methods such as finite element. The reason is that these components are designed to meet several adverse design requirements simultaneously. Henceforth planar random composites reinforced with advanced composite strips will be called strip hybrids. Chamis and Sinclair give a detailed .

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