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The main raw materials have Paulownia, poplar wood, Neem wood, pine, basswood, birch, MDF, plywood and other multi-storey.

主要的原材料有桐木、杨木、楝木、松木、椴木、桦木、密度板、多层合板等。

The in-plane equivalent elastic modulus and tensile strength of stitched composite laminates are studied, and its found that the in-plane equivalent elastic modulus decreases with the increase of stitch density, stitch thread diameter, maximal misalignment angle and the distortion width, and the range is about 5%. The tensile strength of stitched composite laminate increases with the increase of stitch step and decreases with the stitch space.

研究结果表明:随着缝纫密度、缝纫线直径、最大纤维偏转角和缝纫变形区宽度的增加,缝纫复合材料层合板面内等效模量逐渐降低,最大降幅一般在5%左右;缝纫复合材料层合板的拉伸强度随缝纫针距的增加而增大,随缝纫行距的增加而降低,因此缝纫密度对拉伸强度的影响程度要看具体的缝纫针距和行距。

The influence of initial imperfections on the stability ofcomposite laminated plates was studied by solving the nonlinear governing equations for laminated plates with elastical restraints subject to in-plane loading using the energy variational principle and nonlinear geometric equations incorporating the initial imperfection. The governing equations were solved using generalized Fourier series to obtain the effect of the non-uniform order term.

为深入研究初始缺陷对复合材料层板稳定性的影响,利用能量变分原理和考虑初始缺陷的非线性几何方程,建立了具有弹性约束的层合板在面内载荷作用下的非线性稳定性控制方程组,运用广义傅立叶级数法对其进行求解,并进一步获得了影响非线性稳定性控制方程组的性质的非齐次项。

Based on the 4 nodes element used for piezoelectric composite laminate plate and finite element method,and using sensitivities of structural displacements with respect to actuator voltages,the static deformation control considering smoothness requirement for platelike adaptive structure with piezoelectric material layers as actuators is studied in this paper.

基于四节点压电复合材料层合板单元和相应有限元分析方法,利用结构位移对电压的灵敏度,对以压电材料为作动器的板壳自适应结构,进行了考虑平整性要求的静力变形控制。

Trigonometric and Legendre series are applied to construct the displacement models of each composite ply and glue layer in above loading state.

主要工作包括以下几个方面的内容:一、提出了复合材料层合梁和层合板应力分析的一般理论。

Based upon the results of experiment and calculation of several representative unsymmetric composite laminates , the coupling characteristics of unsymmetric laminate was studied.

为了解决机翼的扭转发散、载荷重新分布及操纵反效和操纵效率等问题,基于非对称复合材料的各向异性及相对于普通复合材料更好的可设计性,以几种典型非对称复合材料层板的试验及计算为基础研究了非对称层合板的各种耦合特性,并进行了非对称复合材料机翼的设计,得到了满意的结果。

These include the table saw, jig saw, router, doweling jig, clamps, shaper, orbital sander and other tools you may find necessary to use.

这些包括桌锯、夹具锯、路由器、用合板钉钉合的夹具、钳位、成型机、轨道沙磨机和您可以发现必要使用的其他工具。

The conclusion can be provided as a good reference for the design of the laminates with holes.

本文结论对复合材料层合板优化设计和带孔层合结构的应力计算具有较好的参考价值。

A general theory on stress analysis of composite beam and composite plate under distributed loading is presented in the first part.

一、提出了复合材料层合梁和层合板应力分析的一般理论。

Contact damage analysis of composite beam and composite plate pressed by static loading are accomplished in the third part.

三、对复合材料层合梁和复合材料层合板受静载时的接触损伤问题进行了分析。

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