A metal specimen was subjected to a Vickers hardness test. The indentation on the surface of the specimen had a measured diagonal, d, of 0.24mm and the Vickers hardness number was calculated at a value of 482.91kgf/mm². Determine the applied force, F, that was used to test the specimen. Also, determine the Tensile Strength of the metal, assuming it is hard.

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296 8-10 A 0.505-in.-diameter metal bar with a 2-in. gage length o is subjected to a tensile test. The following measurements are made in the plastic region: 8-13 Chapter 8 Strain Hardening and Annealing Figure 8-23 shows a plot of the natural log- arithm of the true stress versus the natural logarithm of the true strain for a Cu-30% Zn sample tested in tension. Only the plastic portion of the stress strain curve is shown. Determine the strength coefficient K and the work-hardening exponent n. Change in Force Gage length Diameter (lb) (in.) (Al) (in.) 21 27,500 0.2103 0.4800 27,000 0.4428 0.4566 20 25,700 0.6997 0.4343 8-11 Determine the strain-hardening exponent for the metal. Is the metal most likely to be FCC, BCC, or HCP? Explain. A 1.33-cm-diameter metal bar with a 3-cm gage length (10) is subjected to a ten- sile test. The following measurements are made in the plastic region: In [True stress (Pa)] 18 16 -2.5 -2.0 -1.5 -1.0 -0.5 -0.0 In (True strain) Figure 8-23 The natural…

Draw a typical stress vs strain tensile test curve for the following material and label the axis. A typical brittle material subjected to a tensile stress that has been applied to the material till the sample breaks. 1- label the axis and draw the curve for a brittle material. 2- indicate the maximum strength of the material. 3- show on the portion of the curve where young's modulus can be calculated.

How did temperature affect the toughness of the specimens?

A tensile test for a copper specimen has been performed and the following data are obtained.  - Percentage of Elongation = 60 % - Percentage of Reduction in Area = 36 % - Final length after fracture = 35.2 mm - Final Diameter after fracture = 3.54 mm &  - Ultimate stress = 439 MPa    i) Initial Length (in mm) =  ii) Final Area (in mm2) =  iii) Initial Area (in mm2) =

. From the tensile stress-strain behaviour for a casted iron as shown in the following curve. Please answer the following questions (1) Estimate the modulus of elasticity, (2) Calculate the change in length of a specimen with original length of 100mm that is subjected to a tensile stress of 300MPa. (Hint: Using the Hooke's law to get the strain.) 600 500 400 - 300 - 200 - 100 - 2 4 6. 8 10 12 14 16 Strain Strength (MPa)

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A specimen is originally 300 mm long, has a diameter of 14 mm, and is subjected to a force of 2 kN. When the force is increased from 2 kN to 8 kN, the specimen elongates 0.225 mm. Part A Determine the modulus of elasticity for the material if it remains linear elastic. Express your answer to three significant figures and include the appropriate units.