The aim of this paper is to analzye stress and strain characteristics of lower control arm in a personal vehicle for different materials, different geometries, and with topological optimization to better the properties of lower control arm in regards to practical use. The paper is divided into six chapters where we consolidate the theme of this paper from both practical and theoretical aspects. First chapter is introductory, and it describes the basic intent and motivation behind this paper. The second chapter explains basics of car suspension so that it is easier to put everything into perspective. Third chapter deals with theoretical fundamentals of finite element method. That way we get theoretical background of the calculation and analysis used in this paper. Fourth chapter describes four failure theories and a bit more emphasis was given to the fourth one because it is a method that is used as a pointer of successful improvement of lower control arm. With these theories we try to predict yield point, or in other words, occurence of plastic deformations. Fifth chapter describes the process of preparing for numerical analysis and analysis itself. Here we can find models used, settings for the mesh, loads, supports and material that was assigned to the model. After the first analysis, improvements to design of the control arm were made and results showed that that improved control arm was indeed better than the previous one. For comparison a numerical analysis of racing lower control arm was made. After that, properties with different materials were checked and then topological optimization of control arm was made. Topological optimization showed where the surpluss of material was located and so it was removed from those places and numerical analysis was restarted to show that optimization of control arm was successful and correct. Sixth chapter concludes the theme of this paper.