An experimental investigation was performed to study the effect of surface roughness and oxidation on the shear strength of single-lap-joints of AA6061, AA7075 aluminum alloys and an AISI 1080 steel alloy bonded with two different epoxy adhesives. An optimum surface roughness that provided the maximum shear strength was obtained for all the alloys at room temperature. The variation of the shear stress due to the different heat treatment temperatures revealed that the oxides developed on the alloy surfaces adversely affected the adhesive shear strength. The bulk concentration of magnesium of the aluminum alloys were also observed to affect the adhesive shear strength of the joints.

中文翻译：

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拉伸载荷下氧化和表面粗糙度对单搭接粘结金属试样剪切强度的影响

进行了实验研究，以研究表面粗糙度和氧化对AA6061，AA7075铝合金和AISI 1080合金用两种不同的环氧胶粘剂粘合的单搭接接头的剪切强度的影响。在室温下，所有合金均获得了提供最大剪切强度的最佳表面粗糙度。由于不同的热处理温度引起的剪切应力的变化表明，合金表面上形成的氧化物会对粘合剪切强度产生不利影响。还观察到铝合金中镁的整体浓度会影响接头的粘合剪切强度。