Numerical Analysis of Impact Behavior of SiC / Al6061 Metal Matrix Composites


Kösedağ E., Ekici R.

Anatolian Congresses-6th International Applied Sciences Congress, Van, Turkey, 21 - 23 May 2021, pp.35-36

  • Publication Type: Conference Paper / Summary Text
  • City: Van
  • Country: Turkey
  • Page Numbers: pp.35-36

Abstract

In this study, metal matrix composite (MMC) materials were modeled with non-linear finite element method and impact tests were carried out to analyze the impact behavior of MMC. It is assumed that the composite material is produced by powder metallurgy. Al6061 and SiC were selected for matrix and reinforcement material, respectively. 5, 10, 15% SiC reinforced samples were modeled as well as the control sample unreinforced sample. Tests with the weight reduction method were carried out using the ABAQUS / Explicit finite element package program. For modeling, the composite samples are meshed close to the actual powder size and each volume element is considered to be a powder grain. Powder grains are randomly selected by means of an algorithm written with Python software, and SiC material properties are defined according to their volume ratios. The remaining powders have been assigned matrix material property. Impact tests were carried out with 50 Joules energy. For this, a hemispherical tip with 10 mm radius was used and the impact velocity was set to 4.45 m / s. Composite specimens are fixed between two clamps. The samples were modeled using an 8-node brick solid element (C3D8R), while the striker tip was modeled using the R3D4 rigid shell element. Each composite material consists of approximately 13750000 elements. As the damage model, Johnson Cook and Johnson Holmsquit damage parameters were defined. Each analysis was completed in 72 hours on Workstation with 64GB of RAM and 40 CPUs. The impact behavior of composite materials are interpreted by using the contact force time curves obtained from the analysis. Accordingly, an increase in the maximum contact force and a decrease in the contact time was observed as the reinforcing element increased. This proves that as the reinforcement ratio increases, the composite sample takes on a stiffness structure. The maximum contact forces determined for 5, 10, 15% reinforced composites are 12.1, 15.8, 19.3 kN, respectively, while the contact times are 2.6, 2.41, 2.25 ms.