Dynamic behaviour of precracked bimaterial structures applicable to wind propellers

适用于风力螺旋桨的预裂双材料结构的动态行为

• 批准号: 189713862
• 负责人: Professor Dr.-Ing. Wilfried Becker
• 金额: --
• 依托单位: Fachgebiet Strukturmechanik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/189713862?language=en
• 关键词: Dynamic; behaviour; precracked; bimaterial; structures

The proposal is motivated by the dynamic fracture process evaluation in layered composite materials (LCM) and structures, especially for bi-material structures. The intended analysis has application in engineering design and monitoring of knowledge based systems made of LCM (for instance thin coating on turbines and wind propellers), satisfying the increasing demand for high strength, high toughness, and questions connected with critical length of interface delamination, energetic conditions for change of a direction of a crack, critical mechanical loading for a full degradation of a structure, corrosion-resistance and wear-resistance properties and finally for lower failure rates during manufacturing and service processes. The main aim of the project is to develop and validate an analytical model proposed by the applicants Ivanova, Becker et al, (2010) for solving the dynamic interface cohesive behaviour and the delamination in a bi-material structure. The elastic-brittle interface behaviour has been already considered. In order to complete the problem, these investigations have to be continued and directed to cohesive interface behaviour and respective delamination. The application of the results obtained to turbines and wind propellers is one of the goals of the proposal. The analytical solution method is based on the modified dynamic Shear Lag method chosen to find the debond length along the interface and to predict the load-carrying capacity of a bi-material structure as a part of wind propellers. The Shear Lag method is very effective because of its simplicity (1D model). Its successful application in the static case has been proven by Ivanova et al (2009). Simulation studies will be proceeded in order to evaluate such important effects as: geometry of the bi-material structures, elastic and cohesive behaviour of the interface, frequency and amplitude influence of the external loading on debond length, as well as safety zones for the structure.

这一建议是基于对层状复合材料和结构，特别是双材料结构的动态断裂过程的评估。该分析可应用于基于知识的LCM系统的工程设计和监测中(例如涡轮机和风力螺旋桨上的薄涂层)，满足对高强度、高韧性的日益增长的需求，以及与界面分层临界长度、裂纹方向改变的能量条件、结构完全退化的临界机械载荷、耐腐蚀性和耐磨性以及制造和使用过程中较低的故障率相关的问题。该项目的主要目的是开发和验证申请人Ivanova，Becker等人(2010)提出的分析模型，以解决双材料结构中的动态界面内聚行为和分层问题。弹性-脆性界面行为已被考虑。为了完成这个问题，必须继续进行这些研究，并针对粘结界面行为和各自的分层进行研究。将所获得的结果应用于涡轮机和风力螺旋桨是该提案的目标之一。该解析解方法是基于修正的动态剪力滞法，用于确定界面上的脱粘长度并预测双材料结构作为风桨的一部分的承载能力。剪力滞法是一种非常有效的方法，因为它简单(一维模型)。它在静态情况下的成功应用已被Ivanova等人证明(2009年)。将进行模拟研究，以评估两种材料结构的几何形状、界面的弹性和内聚性、外部载荷对脱粘长度的频率和幅值影响以及结构的安全区等重要影响。