Abstract:Generating surface-functional microstructures is an effective way to enhance the bonding strength of metal and carbon fiber-reinforced polymer (CFRP). In this study, different microstructural morphologies consisting of two different patterns were generated on the aluminum alloy (A7075) surface via laser processing. The experimental results indicated that different microstructural morphologies contribute to the enhancement of the shear strength of lap joints. The maximum shear strength of these joints was almos… Show more
“…The wettability and mechanical compatibility of the welding interface were improved by forming a micro-texture on the surface of the light alloy. Liu et al [ 126 ] can efficiently and accurately treat the microstructure of the material surface and improve the bonding strength of al-CFRP by using a laser. Figure 18 A shows the micro-nano morphology of CFRP treated by laser.…”
Section: New Laser Processing Process Methodsmentioning
confidence: 99%
“… Figure 18 Cross-sectional and surface pictures produced by laser processing: ( A ) ( a – f ) six different scan arrays; ( g , h ) cross-sectional images of Al-PCCFRP adhesion lap-joint samples with interfacial microstructures: the square wave structure and array 3 [ 126 ]; ( B ) typical surface and cross-sectional morphology of CFRP/AA2060 joints: ( a , b ) rectangular and ( c , d ) circular spots [ 131 ]. …”
Section: New Laser Processing Process Methodsmentioning
confidence: 99%
“… Figure 19 Two different principles of laser cleaning of CFRP: ( A ) A7075 sheet laser surface treatment; ( a ) schematic diagram of laser surface treatment of A7075 plate; ( b ) schematic diagram of two different microscopic structures; ( c ) force analysis diagram [ 126 ]; ( B ) schematic diagrams illustrating the mechanisms involved in the LAMP joining between the CFRP and AZ31 Mg alloy; ( a ) CFRP and as-received AZ31 Mg alloy; ( b ) CFRP and thermally oxidized AZ31 Mg alloy [ 130 ]. …”
Section: New Laser Processing Process Methodsmentioning
Due to its exceptional advantages, such as high specific strength, high specific modulus, and good fatigue resistance, carbon-fiber-reinforced plastic (CFRP) is frequently utilized in aerospace, aviation, automotive, rail transportation, and other areas. Composite components typically need to be joined and integrated. In the equipment manufacturing industry, the most used methods for processing composite components are cutting, drilling, and surface treatment. The quality of CFRP is significantly impacted by traditional mechanical processing, causing flaws like delamination, burrs, and tears. Laser processing technology has emerged as a crucial method for processing CFRP for its high quality, non-contact, simple control, and automation features. The most recent research on the laser processing of CFRP is presented in this paper, supporting scientists and engineers who work in the field in using this unconventional manufacturing technique. This paper gives a general overview of the key features of laser processing technology and the numerous machining techniques available. The concepts and benefits of laser processing technology are discussed in terms of the material properties, mode of operation, and laser characteristics, as well as the methods to achieve high efficiency, low damage, and high precision. This paper reviews the research development of laser processing of carbon-fiber-reinforced plastics, and a summary of the factors affecting the quality of CFRP laser processing. Therefore, the research content of this article can be used as a theoretical basis for reducing thermal damage and improving the processing quality of laser-processed composite materials, while, on this basis, we analyze the development trend of CFRP laser processing technology.
“…The wettability and mechanical compatibility of the welding interface were improved by forming a micro-texture on the surface of the light alloy. Liu et al [ 126 ] can efficiently and accurately treat the microstructure of the material surface and improve the bonding strength of al-CFRP by using a laser. Figure 18 A shows the micro-nano morphology of CFRP treated by laser.…”
Section: New Laser Processing Process Methodsmentioning
confidence: 99%
“… Figure 18 Cross-sectional and surface pictures produced by laser processing: ( A ) ( a – f ) six different scan arrays; ( g , h ) cross-sectional images of Al-PCCFRP adhesion lap-joint samples with interfacial microstructures: the square wave structure and array 3 [ 126 ]; ( B ) typical surface and cross-sectional morphology of CFRP/AA2060 joints: ( a , b ) rectangular and ( c , d ) circular spots [ 131 ]. …”
Section: New Laser Processing Process Methodsmentioning
confidence: 99%
“… Figure 19 Two different principles of laser cleaning of CFRP: ( A ) A7075 sheet laser surface treatment; ( a ) schematic diagram of laser surface treatment of A7075 plate; ( b ) schematic diagram of two different microscopic structures; ( c ) force analysis diagram [ 126 ]; ( B ) schematic diagrams illustrating the mechanisms involved in the LAMP joining between the CFRP and AZ31 Mg alloy; ( a ) CFRP and as-received AZ31 Mg alloy; ( b ) CFRP and thermally oxidized AZ31 Mg alloy [ 130 ]. …”
Section: New Laser Processing Process Methodsmentioning
Due to its exceptional advantages, such as high specific strength, high specific modulus, and good fatigue resistance, carbon-fiber-reinforced plastic (CFRP) is frequently utilized in aerospace, aviation, automotive, rail transportation, and other areas. Composite components typically need to be joined and integrated. In the equipment manufacturing industry, the most used methods for processing composite components are cutting, drilling, and surface treatment. The quality of CFRP is significantly impacted by traditional mechanical processing, causing flaws like delamination, burrs, and tears. Laser processing technology has emerged as a crucial method for processing CFRP for its high quality, non-contact, simple control, and automation features. The most recent research on the laser processing of CFRP is presented in this paper, supporting scientists and engineers who work in the field in using this unconventional manufacturing technique. This paper gives a general overview of the key features of laser processing technology and the numerous machining techniques available. The concepts and benefits of laser processing technology are discussed in terms of the material properties, mode of operation, and laser characteristics, as well as the methods to achieve high efficiency, low damage, and high precision. This paper reviews the research development of laser processing of carbon-fiber-reinforced plastics, and a summary of the factors affecting the quality of CFRP laser processing. Therefore, the research content of this article can be used as a theoretical basis for reducing thermal damage and improving the processing quality of laser-processed composite materials, while, on this basis, we analyze the development trend of CFRP laser processing technology.
“…Therefore, due to the complexity of surface textures, it is insufficient to analyse the effect of surface texture on the bond strength from a physical adsorption perspective. 17 In this case, the great improvement of joint strength for bio-inspired textures can be mainly attributed to the increased contact area and mechanical interlocking effect.…”
Section: Shear Strengthmentioning
confidence: 97%
“…They proved that combining mechanical, chemical and physical adhesion mechanisms on a multi-scale surface texture could significantly enhance joint strength. In the same way, Liu et al 17 investigated the influence of hierarchical and microstructural textures on the shear strength of Al-CFRP adhesively bonded joints using laser processing. They noticed that the joint strength was governed not only by the contact area and surface roughness but also by the different microstructural arrangements.…”
Surface preparation before adhesive bonding is crucial to improve the resistance and durability of the joint by altering the surface properties of the adherend. The purpose of surface treatment is to clean the surface from contaminants, activate the adherend surface and create an optimal surface structure to promote adhesion mechanisms. In that context, this work aims to investigate the influence of substrate surface texturing on the resistance of adhesive joints. Two bio-inspired surface textures were investigated, Fish scale (FS) and Tree frog (TF). Polycarbonate (PC) specimens with different surface patterns were manufactured using the fused deposition modelling process. Surface morphology, such as pattern dimension (shape and depth), surface roughness (Ra), and wettability, were used to characterise the substrates. The influence of these texture patterns on the shear strength of adhesively bonded joints was evaluated through the standardised block shear test method ASTM D4501-01. Moreover, the shear strength of the structured joints was compared to the results from bonding with polished surfaces (surfaces abraded with 80, 600 and 1000 grit paper), and with as-printed surfaces. The results revealed that the FS and TF surface textures enhanced the shear strength by 242% and 283% compared to the adhesive joints with polished surfaces. It was also shown that the variation in depth of the bio-inspired surface texture has no significant impact on the joint strength. Failure analysis demonstrated that the fracture mode of bonded joints with polished surfaces was the adhesive failure while mixed failure (cohesive and adhesive) characterises the as-printed, TF and FS surfaces. Worthy results are obtained rising the effectiveness of surface texture for the PC's bonded joints. Graphical Abstract [Formula: see text] This is a graphical representation of the abstract.
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