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Laminated Tube You Understand The Characteristics Of Lamination

Oct 17, 2017

Fiber reinforced laminated composites, due to its unique molding process, have many excellent mechanical properties at the same time, there are some weak points, such as the serious anisotropy, low interlayer shear strength, sensitivity to impact load and so on.Laminated Tube

In view of these characteristics, based on the study of the reaction performance and failure process of laminated composite materials under low velocity impact load, this paper mainly discusses the geometrical and material parameters, such as the orthogonal anisotropic parameters, i.e. the ratio of the modulus along the fiber direction to the vertical fiber direction modulus e1/e2, the cross height ratio b/ The influence of H and the stiffness ratio of the plane's external stiffness and the direction of the vertical fiber in the plane on the performance of the E3/e2.Laminated Tube In the calculation and analysis, two-dimensional Lagrange two-unit and three-dimensional 8-node non-coordination unit are used respectively. In the nonlinear finite element equations with the traditional lirch-hoff-love layer theory and the von Karman large deflection strain-displacement relation as control, The iterative scheme of Akay is introduced into each time step of Newmark constant acceleration integral, which makes the calculation process more effective. Through the study of parameters, the paper compares the difference between the results obtained by two-dimensional model and the three-dimensional analysis, and puts forward the suitable method of designing and calculating the laminated plates.Laminated Tube

For homogeneous isotropic plates, it is generally considered that the b/h>20 (b is the short edge of two direction scales in the face) is the thin plate. The thin plates can be analyzed by two-dimensional plate element model, ignoring the effect of shear deformation. But this boundary does not necessarily apply to laminated laminates, because the transverse shear stiffness of laminated plates is lower, even in the cross height ratio b/ When H is greater than homogeneous isotropic plate, it is often shown that the shearing deformation is obvious. So we need to study the effect of b/h on the impact response of laminated plates.Laminated Tube