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Fracture characteristics of the laser bonding joint between the aluminum alloy and the CFRTP with preset aluminum alloy sheet

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Abstract

This paper presents a method to improve the laser bonding joint strength between carbon fiber reinforced thermoplastic composite (CFRTP) and aluminum alloy (Al). In this method, the CFRTP with preset aluminum alloy sheet is attained by the compression molding method after the aluminum alloy sheet is preset between the polyetheretherketone (PEEK) and carbon cloth. The CFRTP with preset aluminum alloy sheet is connected to the aluminum alloy by laser heat source, and the maximum load of the joint can reach 4264 N. Microstructure and fracture surface morphology of joint are observed and analyzed. The results indicate that the interface of the preset aluminum alloy sheet and CFRTP reveals an extensive diffusion of elements compared with the interface of aluminum alloy and CFRTP due to the effect of hot pressing. The fracture failure mode of the lap structure between aluminum alloy and CFRTP is mixed fracture with adhesion fracture as the main component. The fracture position of preset aluminum alloy sheet and aluminum alloy lap structure is observed near the weld seam fusion line, and numerous dimples are found on the fracture surface of aluminum alloy. The increase in joint bonding force is mainly attributed to the collective effect of two lap structures; during the stretching process, the interface between aluminum alloy and CFRTP first undergoes fracture, and then, preset aluminum alloy sheet undergoes plastic fracture failure.

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Authors and Affiliations

  1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, China

    Jiebang Luo, Hengchang Bu, Feiyun Wang, Xiaohong Zhan & Min Yu

  2. Nanjing Institute of Advanced Laser Technology, Nanjing, 210038, China

    Dongtao Liu

Authors
  1. Jiebang Luo
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  2. Hengchang Bu
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  3. Feiyun Wang
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  4. Xiaohong Zhan
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  5. Min Yu
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Contributions

The material preparation was conducted by Jiebang Luo. The welding experiment was conducted by Feiyun Wang. Data processing and manuscript preparation were led by Jiebang Luo with contributions from all authors.

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Correspondence to Xiaohong Zhan.

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Luo, J., Bu, H., Wang, F. et al. Fracture characteristics of the laser bonding joint between the aluminum alloy and the CFRTP with preset aluminum alloy sheet. Int J Adv Manuf Technol 120, 251–263 (2022). https://doi.org/10.1007/s00170-021-08572-4

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  • DOI: https://doi.org/10.1007/s00170-021-08572-4

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