基于表面粗糙度的复合材料/金属层合板粘接界面强化机理试验与数值研究

Study on Strengthening Mechanism for Composite/Metal Laminates Based on Surface Roughness by Experimental and Numerical methods

复合材料/金属层合板具有强度高、耐疲劳和抗冲击等特点,在航空航天等领域得到了广泛应用。然而由于复合材料面板与金属基底性能差异很大,造成界面性能较弱,导致其在制造与使用的过程中经常出现层间分层损伤,引发结构破坏与失效。针对具有不同表面粗糙度的复合材料/金属层合板进行了试验和数值研究,测定了不同表面粗糙度下的复合材料/金属层合板的力学性能。通过试验与数值分析发现,改变金属表面形貌可以有效提高层合板的力学性能;但当表面粗糙度达到一定值时,提高表面粗糙度并不能继续提高层合板的力学性能。通过试验观察分析,证实了提出粘接模型的有效性。试验及数值结果表明,在复合材料/金属层合板结构界面中,适当改变表面粗糙度将是一种提高其界面力学性能的有效措施。

Composite/metal laminates possesses advantages such as high strength, fatigue resistant, impact resistant etc. , which is widely used in aerospace and other fields. However, composite panel and metal substrates have great differ ences in mechanical properties, which creats a weak interface. All those reasons lead to delaminations in laminates in the course of manufacture and using process, which could impair the structural integrity and mechanical performance of FRP/ metal laminates. This article conducts a study on composite/metal laminates of different surface roughness, and mechanical properties of different surface roughness are measured. Through experimental and numerical analysis, it is found that chan ging surface roughness can significantly improve the mechanical property of composite/metal laminates. However, when the surface roughness gets to a certain value, increasing roughness cannot improve the mechanical properties of composite/metal laminates. Through experimental analysis, the validity of the proposed bonding model is verified. Experiments and humeri cal results show that by changing the surface roughness of the interface of composite/metal laminates is one of the effective ways to improve the interface mechanical property.