Development of Numerical Models for Laminated Composite Structures

由于复合材料层合结构正寻求合适的数值模型来替代传统的各向同性均质材料模型，因此本文的主要研究目标是建立合适的、有效的复合材料层合结构数值模型。使用面向曲面的坐标在曲面上定义层压板。开发了适用于各向异性材料的网格生成器和常规有限元分析程序的接口，可用于复合材料层合板的设计。建立了复合材料层合板的原型数值模型。基于所提出的数值模型，采用面向对象的C++语言编制了CAD系统.结果表明，面向对象的程序设计方法是确定层合顺序的有效方法， ...更多信息 针对复合材料层合板，提出了分层高阶变形理论，并给出了理论公式。利用所提出的分层高阶变形理论，建立了灵活通用的复合材料层合板数值建模方法。所提出的方法本质上是归纳的，因此其有效性通过实际的数值应用得到了证实。建立了分层高阶模型的一个算例--选择性分层夹层单元。通过一系列的数值计算，验证了该单元的有效性及其相对于传统模型的优越性，并从振动控制的角度讨论了复合材料结构的设计。应用所建立的数值模型，对高模量CFRP高尔夫球杆的振动模态、频率和阻尼进行了研究，并与实验结果进行了比较。数值模型很好地估计了弹性模量、铺层厚度和阻尼因子对高尔夫球杆振动特性的影响。少

Since laminated composite structures is seeking for their proper numerical model, which alternates the conventional models for isotropic homogeneous materials, the major goal of the present research project wos placed on establishing proper and efficient numerical models for composite laminate structures.Some basic concepts are proposed for developing numerical models of laminated composite structures. A laminate is defined on a surface with the use of surface-oriented coordinates. Both mesh generator suitable for anisotropic materials and interface to conventional finite element analysis codes were developed, which can handle composite lamination design. A prototype numerical model for laminated composite pane was demonstrated. The CAD system was programed with object oriented language, C++, based on the proposed numerical model. The domonstrator indicated that object oriented programing is very effective to defining lamination sequence.As a candidate for the numerical model suitable … More for composite laminates, the layrwise-high-order deformation theory was proposed and then its theoretical formulation was presented. By using the proposed layrwise high-order deformation theory, flexible and versatile numerical modeling methodology for composite laminates was established. The proposed methodology is inherently inductive and hence its validity was confirmed through actual numerical applications. An example of the layrwise high-order model, selective layrwise sandwich element was developed. Through a couple of numerical calculation, the validity and the superiority over the conventional models of the developed-sandwich element were confirmed.Design of composite structures is discussed from the view point of vibration control. Vibration mode, frequency and damping of high-modulus CFRP golf club are investigated by applying the numerical model proposed, and the numerical results are compared with experiments. Effects of elastic moduli, ply thickness and damping factors of the laminates on the vibration characteristics of the golf club are excellently estimated by the numerical model. Less