A finite element model for simulation of delaminations in laminated glass panels subjected to cyclic thermal loading

用于模拟循环热载荷下夹层玻璃板分层的有限元模型

• 批准号: 389600657
• 负责人: Professor Dr.-Ing. Friedrich Gruttmann
• 金额: --
• 依托单位: Fachgebiet Festkörpermechanik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/389600657?language=en
• 关键词: finite; element; model; simulation; delaminations

Laminated glass panels consist of at least two glass components glued with polymeric interlayer materials. Thin inter layers (0,38-2,28 mm) often consist of polyvinyl butyral (or PVB) whereas the glass layers are with 3-25 mm essentially thicker. The laminate ensures the residual carrying capacity if the glass plates are ultimately broken. Applications are given in structural and automotive engineering, naval architecture, aircraft industries and for photovoltaic plants. Especially in outdoor applications with temperature exposure increased, damage evolution due to delamination occurs. Decreasing bonding between glass and polymer interlayer may occur after years of usage and thus influences usability and residual carrying capacity.The project deals with the development of a model to describe initiation and propagation of delaminations in laminated glass panels due to cyclic thermal loading. This requires a series of basic research tasks. Due to the structure of the laminate with entire different behavior of the constituents and hence resulting complicated stress fields existing numerical models cannot be applied. A two-dimensional model, which requires only a fractional amount of computing time in comparison with fully three-dimensional discretizations or so-called FE2-models, is basis of the research. For it the coupled thermomechanical boundary value problem and the kinematics as well as constitutive behaviour to describe propagating delaminations have to be developed. To account for several thousand cycles a time-multiscale model is further part of the work. Parameter studies with a variation of several quantities (material choice and material parameters for the interlayers, influence of imperfections and initial curvatures) give rise to structural improvements. Laminated safety glass is increasingly used as design element in various technical fields. The research project is to provide fundamental contributions for the mechanical understanding of this important structural element.

夹层玻璃板由至少两个用聚合物夹层材料粘合的玻璃组件组成。薄层(0，38-2，28 mm)通常由聚乙烯醇缩丁醛(或PVB)组成，而玻璃层实质上厚3-25 mm。如果玻璃板最终被打破，层压板可确保剩余承载能力。应用领域包括结构和汽车工程、船舶建筑、飞机工业和光伏电站。特别是在户外应用中，随着温度暴露的增加，会出现分层损伤的演变。在使用多年后，玻璃与聚合物夹层之间的结合可能会下降，从而影响可用性和剩余承载能力。该项目致力于开发一个模型来描述由于循环热载荷而导致的夹层玻璃板中分层的起始和扩展。这需要一系列基础研究任务。由于层合板的结构具有完全不同的成分行为，从而产生了复杂的应力场，因此现有的数值模型无法应用。二维模型是研究的基础，与完全三维离散或所谓的Fe2模型相比，它只需要很少的计算时间。为此，必须建立耦合的热力边值问题和描述扩展脱层的运动学和本构行为。为了解释几千个周期，时间-多尺度模型是进一步工作的一部分。对几个变量(夹层的材料选择和材料参数、缺陷和初始曲率的影响)进行的参数研究会带来结构改进。夹层安全玻璃作为设计元素越来越多地应用于各个技术领域。该研究项目旨在为这一重要结构构件的力学理解提供基础性的贡献。