Abstract

Surface roughness obtained from different preparation processes such as sanding, shot blasting, and sand blasting were considered in this study. The effects of surface roughness on shear strength of single-lap adhesive joint were examined. 2024-T3 aluminum sheets were cut into standard pieces and then sanded with seven sandpapers with different mesh, shot blasted for four different duration times and sandblasted under four different pressures. Pairs of prepared surfaces were attached using Araldite 2015 adhesive with high viscosity and HPL1012/HPH112 epoxy adhesive with low viscosity. Results show that the ultimate lap shear strength of the sanded samples initially increase and then decrease as surface roughness is increased. The lap joint strength continuously increases as the surface roughness of shot blasted and sand blasted samples are increased. In sanding, the optimum surface roughness is different for both high and low viscosity adhesives. However, for shot blasting and sand blasting, the optimum surface roughness is the same for both adhesive types. The maximum ultimate lap shear strength of joints for both types of adhesives obtained for sand blasting under 0.6 MPa pressure with 0.6 μm surface roughness.

摘要

本研究考虑了从不同的制备工艺（如砂光、喷丸和喷砂）获得的表面粗糙度。研究了表面粗糙度对单搭接胶接头剪切强度的影响。将2024-T3铝板切割成标准件，然后用七张不同目数的砂纸打磨，喷砂四种不同的持续时间，并在四种不同的压力下喷砂。使用具有高粘度的 Araldite 2015 粘合剂和具有低粘度的 HPL1012/HPH112 环氧树脂粘合剂连接成对的准备好的表面。结果表明，随着表面粗糙度的增加，砂磨样品的极限搭接剪切强度先增加后降低。随着喷丸和喷砂样品表面粗糙度的增加，搭接强度不断增加。在打磨过程中，高粘度和低粘度粘合剂的最佳表面粗糙度是不同的。然而，对于喷丸和喷砂，两种粘合剂类型的最佳表面粗糙度相同。在 0.6 MPa 压力和 0.6 μm 表面粗糙度下喷砂获得的两种粘合剂接头的最大极限搭接剪切强度。