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Lamina stiffness

For a single specially orthotropic layer of thickness, t, and lamina stiffnesses, Qjj, given in Equation (2.61), the laminate stiffnesses are... [Pg.204]

In preceding sections, laminate stiffnesses were predicted on the basis of combination of lamina stiffnesses in accordance with classical lamination theory. However, the actual, practical realization of those laminate stiffnesses remains to be demonstrated. The purpose of this section is to compare predicted laminate stiffnesses with measured laminate stiffnesses to determine the validity of classical lamination theory. Results for two types of laminates, cross-ply and angle-ply laminates, are presented. [Pg.222]

For both odd- and even-layered special cross-ply laminates, the extensional stiffnesses, Aj., are independent of N, the number of layers (although the N individual lamina thickneWs can be summed to get the total laminate thickness t, so N is implicit im quations (4.78) and (4.82)). However, A., and A22 depend on M, the cross-ply ratio, and on F, the lamina stiffness ratio, as shown in Figures 4-22 and 4-23. For a typical glass-fiber-reinforced lamina, F =. 3, so A, varies from. 65Q.nt to... [Pg.226]

The laminate behavior of these special angle-ply laminates can be described with the number of layers, N, the laminae orientation, a, and the laminae stiffnesses, Q , in addition to the total laminate thickness, t. The laminate stiffnesses,... [Pg.232]

The micromechanical behavior of a lamina was treated in Chapter 3. Both a mechanics of materials and an elasticity approach were used to predict the fundamental lamina stiffnesses that were compared to measured stiffnesses. Mechanics of materials approaches were used to predict some of the fundamental strengths of a lamina. [Pg.332]

The topic of invariant transformed reduced stiffnesses of orthotropic and anisotropic laminae was introduced in Section 2.7. There, the rearrangement of stiffness transformation equations by Tsai and Pagano [7-16 and 7-17] was shown to be quite advantageous. In particular, certain invariant components of the lamina stiffnesses become apparent and are heipful in determining how the iamina stiffnesses change with transformation to non-principal material directions that are essential for a laminate. [Pg.440]

Extensive experimental testing was performed on IM6/3100 to obtain longitudinal and transverse stiffnesses and major Poisson s ratio as a function of degree of cure. A detailed explanation of the test procedure can be found in [5], The model predictions and experimental results for this material system are shown in Figures 8.11-8.13. From these relations the lamina stiffnesses Qy can be obtained from... [Pg.254]

In the absence of experimental testing and manufacturers data, lamina stiffness may be calculated using constituent properties and the Halpin-Tsai method. [Pg.82]

Alternative methods of calculating lamina stiffness, namely the Simple Rule of Mixtures the Self-Consistent Doubly Embedded meihoA are... [Pg.83]


See other pages where Lamina stiffness is mentioned: [Pg.13]    [Pg.187]    [Pg.198]    [Pg.27]    [Pg.86]    [Pg.228]    [Pg.239]    [Pg.251]    [Pg.244]    [Pg.82]    [Pg.358]    [Pg.301]    [Pg.327]    [Pg.187]    [Pg.198]    [Pg.2482]    [Pg.2482]    [Pg.2485]    [Pg.2485]    [Pg.2485]    [Pg.2485]   


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