tailieunhanh - Mechanics Analysis Composite Materials Episode 7

Tham khảo tài liệu 'mechanics analysis composite materials episode 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 196 Mechanics and analysis of composite materials Fig. . Calculated circles and experimental solid lines stress -strain diagrams for 15 30 60 and 75 angle-ply layers. or laying-up see . Cherevatsky 1999 . An example of such a part is presented in Fig. . The curved composite pipe shown in this figure was fabricated from a straight cylinder that was partially cured loaded with pre-assigned internal pressure and end forces and moments and cured completely in this state. Desired deformation of the part under loading is provided by the proper change of the fibers orientation angles governed by Eqs. and . Angle-ply layers can also demonstrate nonlinear behavior caused by the matrix cracking described in Section . To illustrate this type of nonlinearity consider carbon-epoxy 15 30 45 60 and 75 angle-ply specimens studied experimentally by Lagace 1985 . Unidirectional ply has the following mechanical properties E 131 GPa 2 11 GPa G12 6 GPa V21 1770 MPa ỡt 54 MPa 230 MPa f 2 70 MPa. Dependencies T and 72 i are linear while for the in-plane shear the stress strain diagram is not linear and is shown in Fig. . To take into account material nonlinearity associated with shear we use constitutive equation derived in Section . Fig. . A curved angle-ply pipe made by deformation of a filament wound cylinder. Chapter 4. Mechanics of a composite layer 197 Fig. . Experimental stress-strain diagrams for transverse tension 1 and in-plane shear 2 of a carbon-epoxy unidirectional ply. 12 - CITI2 C2T12 where Cl 1 G 2 and C 2 10 s MPa -3. The specimens were tested under uniaxial tension in the x-direction. To calculate the applied stress ơv that causes the failure of the matrix we use the simplest maximum stress strength criterion see Chapter 6 that ignores the interaction of stresses . Ỡ-Ị Ơ2 2 K12I 12 Nonlinear behavior associated with the ply degradation is predicted applying the procedure described in Section . .

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