Multiscale thermo-mechanical fracture analysis of polycrystalline silicon shells in photovoltaic modules by a combined phasefield – continuum damage approach.

采用相场连续损伤相结合的方法对光伏组件中的多晶硅壳进行多尺度热机械断裂分析。

• 批准号: 400853899
• 负责人: Professorin Dr. Laura De Lorenzis
• 金额: --
• 依托单位: Institut für Statik und Dynamik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/400853899?language=en
• 关键词: Multiscale; thermo; mechanical; fracture; analysis

The increasing global energy demand, ecological advantages and the economical benefits are three major points for the application of photovoltaic(PV)-modules. The dominating PV-module technology is based on polycrystalline silicon. Brittle fracture of polycrystalline Siliconwafers (PSWs), making up the PV-module, significantly degrades the electrical efficiency. Design of robust PV-Modules, therefore, inevitably requires a thorough investigation of damage events in PSWs.The objective of the present project is the development of an efficient and accurate model of damage induced by thermal or mechanical loads on the PV-module, both at the local scale of the PSW and the global scale of the PV. For this purpose a combined approach consisting of phasefield models on the local scale and a continuum damage approach on the global scale are persued. Essential aspects of the project are: (i) development of a novel phase-field model for brittle fracture accounting for the anisotropy in PSWs, (ii) developing a computational procedure to investigate the residual stresses in PSWs initiated from the production processes (cofiring, flattening, and soldering), (iii) developing a continuum-shell-element for the anisotropic phase-field model based on the geometrically nonlinear theory, (iv) development of a structural element for a PSW comprising of the PSW and the encapsulant (v) validation of the purely mechanical model by experimental analysis (vi) implementation of the thermo-mechanical coupling in the phasefield and continuum damage models (vii) verification by benchmark problems from the literature.These steps will be conducted within a close collaboration between ISD and IAM based on the expertise and experience of each side for the problem at hand.

全球能源需求，生态优势和经济利益的增加是光伏（PV）模块化的三个主要点。主导的PV模型技术基于多晶硅。构成PV模块的多晶硅晶体瓦利瓦夫（PSWS）的脆性断裂，大大降低了电效率。因此，鲁棒的光伏模型的设计不可避免地需要对PSW中的损伤事件进行彻底研究。本项目的目的是开发PV模块上的热或机械载荷引起的有效，准确的损害模型，既在PV模块上的局部规模又是PSW的局部规模和PV的全球规模。为此，通过了由本地尺度上的相磁模型组成的组合方法，并且在全球范围内采用了连续损害方法。该项目的基本方面是：（i）开发用于脆性断裂的新型相位模型，以考虑PSW中的各向异性，（ii）开发一种计算程序，以调查从生产过程（Cofiring，Flatting和soldering）（III）基于持续图的生产过程（Cofiring，Flattering和soldering）的PSWS中的残留应力，以基于持续的型号，以基于持续的型号，以实现持续型的循环效果，以实现阶段式元素。理论，（iv）开发由PSW组成的PSW的结构元素以及通过实验分析（VI）实施纯机械模型（VI）在阶段场和连续性损伤模型（VII）中的纯机械耦合（VI）验证的纯粹机械模型（VI）将基于文献进行详细介绍的经验，并将其与文献进行详细介绍，这将是在范围内进行的。手头的问题。