外粘结复合材料加固铝梁

IF 1.9 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Rabahi Abderezak, T. H. Daouadji, Benferhat Rabia
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引用次数: 3

摘要

最近流行的加固结构梁的方法是将复合材料板粘合到其拉伸面。这种镀梁的一个重要的失效模式是复合板从梁的基材上剥离,这是由于复合板末端粘合剂的高水平应力集中造成的。本文更详细地展示并给出了受均布荷载作用下粘结复合材料(梅卡包覆)板加固铝悬臂梁界面应力的封闭严密解。结果表明:层合板末端存在较高的剪应力和正应力集中,这可能导致加固方案在这些位置过早失效;通过参数化研究,探讨了复合材料的界面行为对复合材料刚度、粘接刚度、复合材料厚度等参数的敏感性;对加固悬臂梁区域板长、粘结剂(模组、厚度)的影响以及对悬臂梁的加载和几何形状的影响;所有这些都被发现对复合构件的最大剪应力和正应力的大小有显著的影响。并将理论预测结果与其他已有解决方案进行了比较。最后,本文的研究有助于理解复合材料-铝混杂结构的界面力学行为和结构设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Aluminum beam reinforced by externally bonded composite materials
A recently popular method for retrofitting reinforced structure beams is to bond composite plates to their tensile faces. An important failure mode of such plated beams is the debonding of the composite plates from the base material of the beam due to high level of stress concentration in the adhesive at the ends of the composite plate. This paper, shows and presents in more detail a closed-form rigorous solution for interfacial stress in cantilever aluminum beams strengthened with bonded composite (sika wrap) plates and subjected to a uniformly distributed load. The results show that there exists a high concentration of both shear and normal stress at the ends of the laminate, which might result in premature failure of the strengthening scheme at these locations. A parametric study has been conducted to investigate the sensitivity of interface behavior to parameters such as laminate and adhesive stiffness, the thickness of the laminate; the effect on plate length of the strengthened cantilever beam region, the effect of adhesive (modules, thickness) and the effect of loading and geometry for the cantilever beam; where all were found to have a marked effect on the magnitude of maximum shear and normal stress in the composite member. The theoretical predictions are compared with other existing solutions. Finally, this research is helpful for the understanding on mechanical behaviour of the interface and design of the composite-aluminum hybrid structures.
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来源期刊
Advances in Materials Research-An International Journal
Advances in Materials Research-An International Journal MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
3.50
自引率
27.30%
发文量
0
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