Abstract We determined the elastic yield strength, ultimate strength, Young Modulus (Elastic Modulus) and the behavior of a given material, as well as true stress and strain at rupture point for two specimens, one each of aluminum and mild steel. We accomplished this by first placing our specimens one at a time into a universal testing machine (UTM), under a controlled environment, slowly increased the tension force on each specimen, stretching each until failure. We then analyzed the data output and plotted a graph. Objective To determine the yield strength, ultimate strength, Young Modulus (Elastic Modulus) and the behavior of a given material when subjected to uniaxial loading and plotting the graph of stress versus strain. Introduction/ Theoretical Background Axial loading is produced by two or more collinear forces acting along the axis of a long slender member, such as mild mild steel bar shown in Figure A. this type of loading occurs in many engineering elements, including individual members that make up machine, bridge and building trusses. When a structure member or machine component is subjected to the external forces (applied loads and support reactions), internal resisting forces will develop within the member or component to balance the external forces. In the simplest qualitative terms, stress is the intensity of internal force on the cross-sectional area of a body. In this test, the distribution of internal force has a resultant force that is normal to exposed cross-sectional area of a simple bar. Thus, When the axial loading is applied to the body, individual points of the body generally move with the direction of the external force. This movement of points is generally known as displacement (vector quantity) that will involve a translation and/or rotation of the body as a whole and neither the size nor the shape of the body is changed. The change in any dimension associated with these displacements is known as deform