arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2108.08153physics.app-phcond-mat.mtrl-sci
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金属-复合材料混杂结构界面失效的建模与仿真

Modeling and simulation of interface failure in metal-composite hybrids

Franz Hirsch, Erik Natkowski, Markus Kästner

摘要:

混杂复合材料在轻量化工程中的应用使纤维增强聚合物和传统金属的材料特定优势得以结合。连接材料之间的界面是特别感兴趣的,因为故障往往发生在结合区。在这方面的贡献,铝部件和玻璃纤维增强环氧树脂的连接被认为是在微观尺度上。本构模型考虑了局部界面的粘结破坏和块体材料的内聚破坏。界面破坏由内聚区模型表示,而聚合物的行为由弹塑性损伤模型描述。一个梯度增强配方,以避免众所周知的局部连续损伤模型的网格依赖性。数值均匀化方案的应用允许有效的牵引分离关系的预测。因此,局部界面强度和几何形状的随机粗糙界面的宏观性质的影响进行了研究的数值研究。粗糙度的增加对有效接头性能有积极影响。

英文摘要:

The application of hybrid composites in lightweight engineering enables the combination of material-specific advantages of fiber-reinforced polymers and classical metals. The interface between the connected materials is of particular interest since failure often initializes in the bonding zone. In this contribution the connection of an aluminum component and a glass fiber-reinforced epoxy is considered on the microscale. The constitutive modeling accounts for adhesive failure of the local interfaces and cohesive failure of the bulk material. Interface failure is represented by cohesive zone models, while the behavior of the polymer is described by an elastic-plastic damage model. A gradient-enhanced formulation is applied to avoid the well-known mesh dependency of local continuum damage models. The application of numerical homogenization schemes allows for the prediction of effective traction-separation relations. Therefore, the influence of the local interface strength and geometry of random rough interfaces on the macroscopical properties is investigated in a numerical study. There is a positive effect of an increased roughness on the effective joint behavior.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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