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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Numerical model for composite patch repair of notched aluminum plates under impact loading
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Numerical model for composite patch repair of notched aluminum plates under impact loading

机译：冲击载荷下缺口铝板复合贴片修复数值模型

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摘要

The damaged area for various structures can be effectively repaired using composite materials. With the effect of impact, damage can occur that cannot be clearly seen in the inner structure of a laminated composite. This can cause delamination and other damage modes in layered composite structures. In this study, three-dimensional dynamic progressive damage analysis was performed in adhesively bonded composite patch-repaired metal notched plates under impact loads to investigate the effect of external composite patch material and thickness. Three-dimensional Hashin damage models were used for the progressive damage model. A user-defined subroutine, VUMAT was written to transfer the damage models to finite element code. By writing a separate script in Python language that relates to the damage models, the weakness in the laminate of the composite patch was transferred to the finite element model with a different degradation model proposed. It was found that plastic deformations occurring after impact damage in the notched metal plates was prevented by the use of composite patches. While glass and carbon fiber exhibit similar behavior at lower impact velocities, the progress of damage is prevented by increasing patch thickness. These behaviors were confirmed by the numerical model and showed an advanced agreement with experimental results.
机译：可以使用复合材料有效地修复各种结构的受损区域。随着撞击的影响，可能发生损坏在层压复合材料的内部结构中不能清楚地看到。这可能导致分层复合结构中的分层和其他损坏模式。在该研究中，在冲击载荷下，在粘粘合的复合贴片修复的金属切口板中进行三维动态渐进式损伤分析，以研究外部复合贴剂材料和厚度的效果。三维Hashin损坏模型用于渐进式损伤模型。编写了一个用户定义的子程序，VUMAT将损坏模型传输到有限元代码。通过在与损坏模型相关的Python语言中撰写单独的脚本，将复合贴片的层压板中的弱点转移到有限元模型，提出不同的劣化模型。发现通过使用复合贴剂，防止了在缺口金属板中发生冲击损伤后发生的塑性变形。虽然玻璃和碳纤维在较低冲击速度下表现出类似的行为，但通过增加贴片厚度，防止了损坏的进展。这些行为通过数值模型确认，并与实验结果显示了先进的协议。

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