• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Composite Structures >A new sandwich element for modeling of partially delaminated sandwich beam structures
【24h】

A new sandwich element for modeling of partially delaminated sandwich beam structures

机译：用于部分分层夹层梁结构建模的新型三明治元件

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this paper, a new sandwich beam element is introduced for analyzing sandwich beam structures with a flexible core and partially delaminated regions. In this element, interfaces between the core and face sheets are modeled by two independent layers. The model uses a high-order sandwich panel theory to consider flexibility of the core with nonlinearities associated with geometry and real contact characteristics of the delaminated regions. The proposed motion field takes advantage of both displacement and displacement gradients in the core boundaries. Therefore, the kinematics allow continuity conditions for displacements and rotations at the interfaces to be exactly satisfied in fully bounded and delamination regions. By using finite element (FE) formulation with Hermite shape functions, elemental vectors and matrices are derived in the framework of Hamilton's principle. FE governing equations are solved by Newton-Raphson iterative scheme. A 2D FE method is also developed to verify predictions of the sandwich model for various delamination cases. Comparison studies show that results from both sandwich and 2D FE models are in a good agreement. They can predict large deformation results for the sandwich behaviors much better than the simplified model available in the literature. A set of parametric study is devoted to provide an insight into the influence of boundary condition, number and position of delaminated regions on deformations, stresses and instability of fully clamped and cantilever sandwich beams. The developed formulation is not only more computationally efficient than 2D models usually used for such analysis, but also at the same time is accurate, simple and robust. It is also found that modeling of the delaminated zone core and stress distribution at each interface independently is crucial to accurately analyze instability behaviors of sandwich structures.
机译：在本文中，引入了一种新的夹层梁元件，用于分析柔性芯和部分分层区域的夹层梁结构。在该元素中，核心和面部纸张之间的接口由两个独立的层进行建模。该模型使用高阶三明治面板理论，以考虑核心的灵活性，具有与分层区域的几何形状和实际接触特性相关的非线性。所提出的运动场利用核心边界中的位移和位移梯度。因此，运动学允许在完全有界和分层区域中完全满足接口的位移和旋转的连续性条件。通过使用具有Hermite形状功能的有限元（Fe）配方，在汉密尔顿原则的框架中导出了元素矢量和矩阵。 FE管理方程由Newton-Raphson迭代计划解决。还开发了2D Fe方法以验证各种分层案例的三明治模型的预测。比较研究表明，三明治和2D FE模型的结果符合良好。它们可以预测三明治行为的大变形结果，比文献中的简化模型更好。致力于一组参数研究，以了解分层区域对完全夹紧和悬臂夹梁的变形，应力和不稳定性的边界条件，数量和位置的影响。开发的配方不仅比通常用于这种分析的2D型号更具计算效率，而且同时也准确，简单且坚固。还发现每个界面的分层区域核心和应力分布的建模独立地是至关重要的，可以准确地分析夹层结构的不稳定行为。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号