![]() Ultimate tensile strengths vary from 50 MPa for an aluminum to as high as 3000 MPa for very high-strength steels. However, it is dependent on other factors, such as the preparation of the specimen, the presence or otherwise of surface defects, and the temperature of the test environment and material. It is an intensive property therefore its value does not depend on the size of the test specimen. Even though deformations can continue to increase, the stress usually decreases after the ultimate strength has been achieved. The stress-strain curve contains no higher stress than the ultimate strength. When a ductile material reaches its ultimate strength, it experiences necking where the cross-sectional area reduces locally. Often, this value is significantly more than the yield stress (as much as 50 to 60 percent more than the yield for some types of metals). Ultimate tensile strength is often shortened to “tensile strength” or even to “the ultimate.” If this stress is applied and maintained, fracture will result. ![]() This corresponds to the maximum stress that can be sustained by a structure in tension. The ultimate tensile strength is the maximum on the engineering stress-strain curve. Ultimate tensile strength of Mild Steel is between 400 – 550 MPa. Strength of a material is its ability to withstand this applied load without failure or plastic deformation. ![]() Strength of materials basically considers the relationship between the external loads applied to a material and the resulting deformation or change in material dimensions. ![]() In mechanics of materials, the strength of a material is its ability to withstand an applied load without failure or plastic deformation. For structural applications, material properties are crucial and engineers must take them into account. Materials are frequently chosen for various applications because they have desirable combinations of mechanical characteristics. ![]()
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