INVESTIGATION OF INTERLAMINAR STRENGTH OF FIBER METAL LAMINATES INCLUDING 6061-T4 ALUMINUM SHEET SURFACES PROCESSED WITH FIBER LASER TECHNIQUE


Aksüt R., Bora M. Ö. , Akman E.

7th International Congress on Engineering, Architecture and Design, Ankara, Turkey, 21 - 22 May 2021, vol.15, pp.789-797

  • Publication Type: Conference Paper / Full Text
  • Volume: 15
  • City: Ankara
  • Country: Turkey
  • Page Numbers: pp.789-797

Abstract

Fiber metal laminates (FML) as a type of composite materials are obtained from the production of low-thickness metal sheet and resin-impregnated fabrics in sandwich form. Before production, mechanical or chemical surface pretreatments are traditionally applied to the metallic material surface to improve the interlaminar strength between metal and prepreg in FML materials. As an alternative to these surface pretreatment techniques, there are also some studies in which metal material surfaces are pretreated with laser technique in recent years. Determining the appropriate laser parameters depending on the material is very important to achieve high quality in the final product. In this study, it is aimed to improve the interlaminar strength between metal and prepreg by performing surface pretreatments under different laser parameters (such as laser scanning speed, power and frequency) on the surface of metal materials before the production of FML materials. For this purpose, AA6061-T4 aluminum sheets were treated with a pulsed fiber laser before the 2/1 configurated FML materials were produced with the hot press technique. In order to determine the effect of laser parameters on the metal/prepreg interlaminar strength of FML materials, three point bending tests were performed according to the ASTM D790-15 standard. The flexural strength and flexural modulus of FML samples were determined. The obtained results showed that maximum load values obtained at laser frequency as 80 kHz, laser power as 30 and 50 W, and laser scanning speed as 800 and 1600 mm/s for L8 and L9 laser treatment parameters. Flexural strength values increased to 375,99±8 MPa (L8) and 376,62±9 MPa (L9) according to untreated (328,11±6 MPa) and sanded (334,84±3 MPa) FML samples. In addition, flexural modulus values also increased from 57,8 GPa to 69,8 GPa by applying L9 laser process parameters.