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The Rockwell scale is a hardness scale based on indentation hardness of a material. The Rockwell test measures the depth of penetration of an indenter under a large load (major load) compared to the penetration made by a preload (minor load). [1] There are different scales, denoted by a single letter, that use different loads or indenters.
The ultimate tensile strength of a material is an intensive property; therefore its value does not depend on the size of the test specimen.However, depending on the material, it may be 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.
Annealed 6061 (6061-O temper) has maximum ultimate tensile strength no more than 150 MPa (22 ksi), [7] [8] and maximum yield strength no more than 83 MPa (12 ksi) [7] or 110 MPa (16 ksi). [8] The material has elongation (stretch before ultimate failure) of 10–18%.
Tensile strength (annealed) 586 MPa Tensile strength (stress relieved) 1030 MPa Tensile strength (hard) 1170 MPa Coefficient of thermal expansion: 12×10 −6 K −1 at 20 °C Specific heat: 0.523 J g −1 K −1 [4] Thermal conductivity: 29.7 W m −1 K −1 [5]
T6 temper 7075 has an ultimate tensile strength of 510–540 MPa (74,000–78,000 psi) and yield strength of at least 430–480 MPa (63,000–69,000 psi). It has a failure elongation of 5–11%. [9] The T6 temper is usually achieved by homogenizing the cast 7075 at 450 °C for several hours, quenching, and then ageing at 120 °C for 24 hours.
Typical material properties for 6005A aluminum alloy include: [2] Density: 2.71 g/cm 3, or 169 lb/ft 3. Electrical Conductivity: 47 to 50% IACS. Young's modulus: 70 GPa, or 10 Msi. Ultimate tensile strength: 190 to 300 MPa, or 28 to 44 ksi. Yield strength: 100 to 260 MPa, or 15 to 38 ksi. Thermal Conductivity: 180 to 190 W/m-K.
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The Brinell hardness number can be correlated with the ultimate tensile strength (UTS), although the relationship is dependent on the material, and therefore determined empirically. The relationship is based on Meyer's index (n) from Meyer's law. If Meyer's index is less than 2.2 then the ratio of UTS to BHN is 0.36.