Development of Numerical Models for Laminated Composite Structures

由于层合复合材料结构正在寻求合适的数值模型来替代传统的各向同性均质材料的数值模型，因此，本研究的主要目标是建立合适和有效的复合材料层合结构的数值模型。层压板使用面向曲面的坐标在曲面上定义。开发了适用于各向异性材料的网格生成器和与常规有限元分析程序的接口，可以处理复合材料层合板的设计。给出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，用面向对象语言C++编制了CAD系统程序。算例表明，面向对象的程序设计方法对于定义层序是非常有效的。作为适合…的数值模型的候选者针对复合材料层合板，提出了层状高阶变形理论，并给出了理论公式。利用提出的层状高阶变形理论，建立了一种灵活、通用的复合材料层合板数值模拟方法。所提出的方法具有内在的归纳性，并通过实际的数值应用验证了其有效性。给出了一个层状高阶模型、选择性层状夹层单元的算例。通过数值计算，验证了改进的夹层单元模型的有效性和优越性。从振动控制的角度对复合材料结构的设计进行了探讨。应用所建立的数值模型对高模CFRP高尔夫球杆的振型、频率和阻尼性进行了研究，并与实验结果进行了比较。数值模型较好地估计了层合板的弹性模数、铺层厚度和阻尼系数对高尔夫球杆振动特性的影响。较少

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