Effect of the surface morphology of 3D printed titanium substrates on the mode I fracture toughness of metal-metal and metal-composite bonded joints

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL Theoretical and Applied Fracture Mechanics Pub Date : 2025-02-01 Epub Date: 2024-11-26 DOI:10.1016/j.tafmec.2024.104778

Michele Gulino , Rosemere de Araujo Alves Lima , Fabrizio Moroni , Alessandro Pirondi , Sofia Teixeira de Freitas

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Abstract

Parts manufactured with Laser Powder Bed Fusion (LPBF) are drawing interest in the adhesive joints research because of their high surface roughness, which is usually associated with good adhesion. This work aims to assess the adhesion strength of the inherent surface morphology of LPBF manufactured titanium.

Double Cantilever Beam (DCB) tests were carried out to determine the mode I fracture toughness of joints comprising as-printed titanium (Ti6Al4V) adherends, namely titanium-titanium secondary bonded and titanium-Carbon Fibre Reinforced Polymer (CFRP) co-bonded joints. The effect of high-temperature oxidation on the fracture toughness was also evaluated by testing a batch of joints in which the titanium underwent a post-printing thermal treatment. The as-printed specimens were compared to the same type of joints but with sandblasted titanium adherends to evaluate the effect of this surface pre-treatment on the value of fracture toughness.

The results indicate that non-oxidised titanium joints with untreated adherends had an average of 11% higher fracture toughness than their sandblasted counterparts. On the other hand, sandblasting proved beneficial for oxidised joints, increasing the fracture toughness by 64% on average over the untreated samples.

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3D打印钛基板表面形貌对金属-金属和金属-复合键合接头I型断裂韧性的影响

激光粉末床熔合（LPBF）制造的零件由于其表面粗糙度高，通常与良好的附着力有关，因此引起了粘接接头研究的兴趣。本工作旨在评估LPBF制造的钛的固有表面形态的粘附强度。通过双悬臂梁（DCB）试验，确定了打印钛（Ti6Al4V）粘附体，即钛-钛二次键合和钛-碳纤维增强聚合物（CFRP）共键合接头的I型断裂韧性。通过对一批打印后热处理的钛合金接头进行测试，评价了高温氧化对断裂韧性的影响。将打印后的试样与喷砂钛粘接的相同类型的接头进行比较，以评估这种表面预处理对断裂韧性值的影响。结果表明，未氧化钛接头与未经处理的附着物相比，其断裂韧性平均提高11%。另一方面，喷砂被证明有利于氧化接头，比未处理的样品平均增加64%的断裂韧性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.