Limiting strain is the strain at the onset of fracture / necking in a sheet metal. This limiting strain varies with respect to the material / condition of the material, strain condition in geometrical features of a sheet metal. In conventional sheet forming, the solid sheets posses higher limiting strain compared to that of perforated sheets. Perforated sheets find increased applications due to their reduced weight, versatility and aesthetic appearances. In this work, triangular pattern - square holed, perforated commercial aluminium sheets of various thicknesses are considered for the study. The limiting strain for the above sheet metals is predicted using Finite Element Analysis. It is found that the limiting strain is influenced by percentage of open area, ligament ratio, hole size and thickness.