研究目的
To explore the feasibility of largely enhancing the strength of the metal-CFRP hybrid joints by modifying the metal surface structure via laser processing pretreatment.
研究成果
The study successfully achieved strong lap joints of CFRTP to Al alloy and steel by modifying the metal surface structure via laser processing pretreatment. The maximum tensile shear force of the joints was significantly improved, attributed to the increase in mechanical anchors and chemical bonding area at the interface. The findings suggest that laser processing pretreatment is an effective method for enhancing the strength of metal-CFRP joints.
研究不足
The study is limited by the need to control bubbles in the joints and optimize the morphology, depth, distance, and size of the laser processed pores. Additionally, the focus was primarily on Al alloys and plain carbon steel, with limited exploration of other metals and CFRPs.
1：Experimental Design and Method Selection:
The study involved pretreating 5052 Al alloy and plain carbon steel with a laser-processing method to create coarse porous surfaces, followed by friction lap joining to polyamide 6 based CFRP.
2：Sample Selection and Data Sources:
The materials used were 3-mm-thick CFRTP with PA6 matrix sheets, 2-mm-thick 5052 Al alloy, and plain carbon steel (SPCC) sheets.
3：List of Experimental Equipment and Materials:
A laser-processing method was used for pretreatment, and friction lap joining was performed using a SKD tool steel and WC-Co tool with a shoulder diameter of 15 mm without a pin.
4：Experimental Procedures and Operational Workflow:
The metal surfaces were laser-processed to create porous structures, then joined to CFRP using friction lap joining with specific parameters.
5：Data Analysis Methods:
The tensile shear force of the joints was measured, and microstructural observations were conducted using optical microscopy and scan electron microscopy.
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