Abstract Selective laser melting (SLM) is a state-of-the-art additive manufacturing (AM) process for producing complex metal components. For metal components produced by the SLM process, a poor surface quality can be a concern, as the rough surface could initiate surface cracks early under static or fatigue loading and negatively affect the dimensional tolerance. However, the inherently rough surface has potential to eliminate the necessity for additional surface treatment for adhesive bonding. In this work, the influence of the printing angle (45o – 90o) on the surface morphology of SLM manufactured parts and thus its impact on the interfacial fracture toughness of aluminium/carbon composite joints bonded with epoxy adhesive was investigated experimentally. The surface roughness analysis showed that as the printing angle increased, the roughness of the upper surface of the SLM printed part increased in general, while the lower surface showed the opposite trend. The single-leg bending tests results showed that the inherent surface roughness of the printed part significantly improves the interfacial fracture toughness (from 289 J/m2 to 747 J/m2) and is much more effective in the prevention of interfacial crack propagation in comparison to the surface mechanically abraded after printing.

中文翻译：

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SLM印刷铝表面形貌对金属-复合材料混合接头界面断裂韧性的影响

摘要 选择性激光熔化 (SLM) 是一种用于生产复杂金属部件的最先进的增材制造 (AM) 工艺。对于由 SLM 工艺生产的金属部件，较差的表面质量可能是一个问题，因为粗糙的表面可能会在静态或疲劳载荷下早期引发表面裂纹，并对尺寸公差产生负面影响。然而，固有的粗糙表面有可能消除对粘合剂进行额外表面处理的必要性。在这项工作中，通过实验研究了印刷角度（45o - 90o）对 SLM 制造零件的表面形貌的影响，从而对用环氧粘合剂粘合的铝/碳复合材料接头的界面断裂韧性的影响进行了实验研究。表面粗糙度分析表明，随着印刷角度的增加，SLM 打印部件上表面的粗糙度总体增加，而下表面则呈现相反的趋势。单腿弯曲试验结果表明，打印部件的固有表面粗糙度显着提高了界面断裂韧性（从 289 J/m2 到 747 J/m2），并且与相比于更有效地防止界面裂纹扩展。印刷后机械磨损的表面。