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.

提出的研究工作的目的是分析和评估在湿热压电衬底层上的智能湿热贴片的时谐波行为。分析包括考虑在各自负载情况下贴片可能从基板层剥离。为了进行预期的研究，将应用剪切滞后模型将二维弹性方程的控制系统简化为给定贴片/衬底结构的轴向应力和位移的一维动态方程组。温度、电位移和水分的微分方程也将简化为一维方程。此外，将确定从构型重叠区的左右两侧发出的分层的界面剥离长度。进一步的目标是通过在固定载荷、材料和几何特性下的电梯度的各自值，确定检测界面剥离长度的可能准则。在实际应用中，将通过遗传算法计算模型参数的安全区间和工作状态的安全区域。在疲劳失效具有脆性特性的基础上，提出了智能轻量化结构疲劳寿命研究的一些出发点。