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The Behavior of Structures Composed of Composite Materials Part 5

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Tham khảo tài liệu 'the behavior of structures composed of composite materials part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 109 3.9 Quasi-Isotropic Composite Panels Subjected to a Uniform Lateral Load When a composite laminate has a stacking sequence in which 11 - iXn it is referred to as quasi-isotropic. In that case it behaves as an isotropic plate in the determination of lateral deformations w x y and stress couples Mỵ Mand A l . For isotropic plate monocoque plates several textbooks such as Timoshenko and Woinowsky-Krieger 4 and Vinson 7 have provided expressions for the maximum deflection and the maximum stress couple M a plate attains when subjected to a constant laterally distributed load . such as _C0p0a4 wmax 3-71 EhJ max 3.72 where a is the smaller plate dimension b is the longer plate dimension li ơ E is the modulus of elasticity of the plate h is the plate thickness and - 0.3 . The dimensionless constants C l and C are given in tabular form for various boundary conditions and these are repeated herein for completeness in Tables 3.1 through 3.4. Table 3.5 also provides information for the case wherein the plate is subjected to a hydraulic head. These tables and procedures are well known and well used. TABLE 3.1. Coefficients for determining Maximum Deflections and Maximum Stresses for a Rectangular Plate with b a. Simply Supported at the Edges under Uniform Pressure Loading Pg with Sufficient Corner Forces to Hold it Down on the Foundation v 0.3 . bl a 1 1.2 1.4 1.6 1.8 2 3 4 5 00 c0 0.044 0.062 0.077 0.091 0.102 0.111 0.134 0.140 0.142 0.142 Cl 0.048 0.063 0.075 0.086 0.095 0.102 0.119 0.124 0.125 0.125 TABLE 3.2. Coefficients for determining Maximum Deflections and Maximum Sưesses for a Rectangular Plate under Uniform Load pg with the a Edges Clamped and b Edges Simply Supported v 0.3 . bl a 00 3 2 1.6 1.3 1 0.75 0.50 0.25 Co 0.142 0.128 0.099 0.066 0.042 0.021 0.0081 0.00177 0.00011 0.125 0.125 0.119 0.109 0.094 0.070 0.045 0.021 0.0052 110 TABLE 3.3. Coefficients for Determining Maximum Deflections and Maximum Stresses for a Rectangular Plate under Uniform Loading Pg .