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

Kösedağ E. , Ekici R.


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


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.

Keywords: Metal matrix composite, Finite element method, Low velocity impact, Impact

resistance, Numerical analysis.