Reviewed by Lexie CornerJan 28 2025
Researchers from Seoul National University of Science and Technology have identified a technique to enhance the strength and durability of joints in lightweight vehicle designs. The findings, published in Optics & Laser Technology, focus on the application of laser surface texturing (LST) on galvanized advanced high-strength steel (AHSS).
Professor Changkyoo Park’s research demonstrated that specific LST patterns significantly improve the performance of metal-polymer joints, which are critical for reducing vehicle weight and improving fuel efficiency. The study simulated real-world stress conditions to evaluate the functionality of these joints.
This method provides a breakthrough for joining metal and plastic, two materials traditionally challenging to bond due to differences in their physical properties. By grooving different LST patterns on the surface of AHSS and joining it with glass fiber-reinforced polyamide 6 (PA 6) using injection molding, we significantly improved the mechanical interlock and overall strength of the joints.
Changkyoo Park, Professor, Seoul National University of Science and Technology
The study focused on specific LST patterns, including orthogonal and diagonal designs, which significantly enhanced tensile shear strength and wear resistance. These patterns achieved strengths of up to 78.9 MPa—substantially higher than the 25 MPa typically observed with conventional automotive structural adhesives. The LST patterns improved mechanical bonding between PA 6 and AHSS, a critical material pairing in the automotive industry's shift toward lightweight designs.
Optimizing AHSS surface structures using LST could address a key challenge in the automotive sector: reducing vehicle weight to meet emissions and fuel efficiency standards. The enhanced bonding would facilitate the integration of plastic materials into vehicle components, contributing to overall weight reduction.
This approach has the potential to boost fuel efficiency and reduce greenhouse gas emissions, aligning with global sustainability goals in transportation. It also offers practical benefits such as increased durability, improved safety, and enhanced performance for vehicles under real-world conditions.
Laser surface texturing is fast and programmable, allowing optimal strength and longevity at any desired joints in the car body and chassis.
Changkyoo Park, Professor, Seoul National University of Science and Technology
“The potential of this research extends beyond automotive applications. By developing more efficient methods for joining different materials, this study opens new avenues for innovation in various industries such as aerospace and shipbuilding, contributing to the global push for greener, more efficient technologies,” concluded Park.
Journal Reference:
Jeong, J., et al. (2025) Effect of laser surface texturing pattern on mechanical properties in metal-polymer direct joining. Optics & Laser Technology. doi.org/10.1016/j.optlastec.2024.112049