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Meshless analysis of substrate stiffness and its effect on metallic double-L joint strength and stress distributions

机译：基材刚度的无丝毫分析及其对金属双L关节强度和应力分布的影响

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摘要

Aircraft, automotive, and wind turbine blade construction often require bonding of non-parallel substrates. T-joints are used for such purpose. However, reduced information about their mechanical behaviour is available in the literature, mostly reported with similar substrate thickness. When bonding a thin substrate on a thicker one, the thinner substrate could largely deform before the adhesive layer fails. Therefore, numerical techniques as the meshless methods (MM) are suitable to analyse this joint configuration. In this work, a MM was used to analyse T-joints with metallic substrates. The analyses were elastic-plastic and considered the Exponent Drucker-Prager (EDP), which is appropriate for ductile adhesives. Four substrate thicknesses (1-4 mm), and three different adhesive systems were considered, aiming to investigate the EDP suitability for the analysis of adhesive joints with non-parallel substrates and how substrate thickness and adhesive ductility influence joint strength (P_(max)). Thus, P_(max), stress and strains along the bond-line, and plastic hinges in the substrates were evaluated. Regardless of the adhesive system, the increase of substrate thickness (t_(P2)) also increased P_(max). For adhesives with failure strain (ε_f) below 10%, experimental and numerical results have a good agreement, showing that the proposed methodology is suitable to analyse this joint type.
机译：飞机，汽车和风力涡轮机叶片结构通常需要粘接非平行衬底。 T关节用于此目的。然而，文献中可获得有关其机械行为的减少信息，主要报道具有类似的基板厚度。当将薄基板粘合在较厚的基板上时，在粘合剂层发生故障之前，较薄的基板可能在很大变形。因此，作为无网格方法（mm）的数值技术适合于分析该联合配置。在这项工作中，使用MM与金属基材分析T关节。分析是弹性塑料，并考虑指数Drucker-PRAGER（EDP），其适用于延性粘合剂。考虑四个基板厚度（1-4mm）和三种不同的粘合剂系统，旨在研究EDP适用性，用于分析具有非平行衬底的粘合接头以及衬底厚度和粘合剂延展性如何影响关节强度（P_（最大） ）。因此，评价沿键合线的P_（最大值），应力和菌株和衬底中的塑料铰链。无论粘合剂系统如何，衬底厚度的增加（T_（P2））也增加了P_（最多）。对于低于10％的失效菌株（ε_F）的粘合剂，实验性和数值结果具有良好的一致性，表明所提出的方法适合分析这种关节型。

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