Tensile test is one of the most important mechanical property test. In this test to use a specimen of standard form or you can use other form of specimen. The material has known dimensions , like length and cross-sectional area for example a specimen of rectangular cross section. The tensile test is measure of the mechanical behavior of a material threrefor Yield strength is point to divide between elastic deformation behavior and plastic deformation behavior. Next part Ultimate strength (tensile strength) is plastic deformation or the maximum stress a material can withstand. The next properties is resistance to fracture is ability of a material to absorb energy without breaking