Dynamic time-harmonic behaviour of smart patches on hygrothermalpiezoelectric substrates

湿热压电基板上智能贴片的动态时谐行为

• 批准号: 317044714
• 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: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/317044714?language=en
• 关键词: Dynamic; time; harmonic; behaviour; smart

The aim of the proposed research work is the analysis and assessment of the time-harmonic behaviour of a smart hygropiezothermal patch on a hygrothermalpiezoelectric substrate layer. The analysis includes the consideration of possible delamination of the patch from the substrate layer under respective load cases. For the intended investigation the shear lag model will be applied to reduce the governing system of two-dimensional equations of elasticity to a one-dimensional dynamic system of equations for the axial stresses and displacements of the given patch/substrate configuration. The differential equations for temperature, electric displacement and moisture will be also reduced to one-dimensional equations. Further the interfacial debond length of delaminations emanating from the left and right sides of the overlap zone of the configuration will be determined. A further aim is the identification of a possible criterion for detecting the interface debond length via the respective value of the electric gradient at fixed loading, material and geometric characteristics. For the practical application safety intervals of the model parameters as well as the safety zones of the work regime will be calculated via a genetic algorithm (GA). Some starting point of the consideration on the fatigue life of the smart lightweight structure will be also proposed on the basis that fatigue failure is brittle in nature.

拟议的研究工作的目的是分析和评估智能杂志热贴片在湿透者Piezoelectric底物层上的时间谐波行为。该分析包括考虑在各个负载情况下从基板层中斑块的分层。对于预期的调查，将应用剪切滞后模型将弹性的二维方程的管理系统减少到给定斑块/底物配置的轴向应力和位移的一维动态系统。温度，电位移和水分的微分方程也将减小为一维方程。此外，还将确定从配置重叠区的左侧和右侧发出的分层的界面解脱长度。另一个目的是识别通过在固定载荷，材料和几何特性下电梯度的相应值检测界面脱节长度的可能标准。对于模型参数的实际应用安全间隔以及工作状态的安全区域，将通过遗传算法（GA）计算。考虑到智能轻量级结构的疲劳生活的一些起点，也将提出，以疲劳失败本质上是脆弱的。