ABSTRACT

Surface roughness of the adherends represents an important factor for manufacturing a reliable bonded joint in structural applications. In case of bonding of parts in carbon fibre reinforced polymer (CFRP), an increase of roughness parameters can be obtained with various techniques. In this paper, the morphology obtained from a CO₂ laser texturing on CFRP laminates were investigated. CFRP laminates were manufactured and subjected to laser texturing with various densities. In particular, the densities of treatment have been defined as a function of the grid dimensions of the texture. Subsequently, non-contact measurements were carried out to evaluate the evolution of the surface roughness parameters as a function of the density of the laser treatment. Results showed a strong correlation between surface roughness and density of treatment. In conclusion, these results were compared with experimental tests, which showed that the mechanical performance for ENF bonded joints was limited only by the flexural mechanical resistance of the CFRP adherends. As a result of this work, the developed laser texturing approach is potentially able to increase the mechanical resistance in the function of the real local load acting on the complex bonded joint, optimizing time and cost process.

摘要

被粘物的表面粗糙度是在结构应用中制造可靠粘合接头的重要因素。在用碳纤维增强聚合物 (CFRP) 粘合零件的情况下，可以通过各种技术增加粗糙度参数。在本文中，从 CO ₂研究了 CFRP 层压板的激光纹理。CFRP 层压板被制造出来并进行不同密度的激光纹理化处理。特别是，处理密度被定义为纹理网格尺寸的函数。随后，进行了非接触式测量以评估表面粗糙度参数作为激光处理密度的函数的演变。结果表明表面粗糙度和处理密度之间存在很强的相关性。总之，将这些结果与实验测试进行比较，结果表明易恩孚粘接接头的机械性能仅受 CFRP 被粘物的弯曲机械阻力的限制。由于这项工作，