tailieunhanh - Harris' Shock and Vibration Handbook Part 15

Tham khảo tài liệu 'harris' shock and vibration handbook part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | CHAPTER THIRTY-FIVE into laminate properties. For all the thermoelastic properties this translation is accomplished by the usual rules for transformation of stress and strain. However the strength properties tend to be modified by the mutual constraint imposed by adjacent layers and therefore is a function of the individual layer thickness. The result is a need to modify the basic unidirectional properties one of the most significant being the ultimate transverse strain to failure in tension of individual layers. Unidirectional layer compressive strength and the associated ultimate strain to failure is also influenced to a significant degree by the mutual support offered by adjacent transverse or angled layers. As a consequence correction factors are sometimes introduced to compensate for these effects but more routine tests are conducted on the actual laminate configuration in an effort to establish reliable allowables for its use in design. LAMINATED COMPOSITE DESIGN For the simultaneous design of material and structure that is the basic philosophy for composite structures development laminated plate theory LPT and the associated computer codes represent the fundamental tool for the composite designer. The anatomy of a composite laminate indicating the translation from the constituent fiber and matrix properties to those of a built-up laminate is illustrated in Fig. . ữ-ĩ aT iiiTF ge C IXn t in. cm Ey 10 msi 69 GPa ay iiiTF ne C Ex 10 msi 69 GPa ax Iii-TF iiiTC FIGURE The anatomy of a composite laminate. Et msi GPa FTu 7 ksi MPa En Et in. cm I ENGINEERING PROPERTIES OF COMPOSITES Values contained in this figure compare with those presented in Table . Figure also illustrates the use of an alternative form of material a fabric laminate that can provide similar but slightly inferior properties in a reduced thickness. The ability to produce a single layer comprised of .