In the tensile test figure shown which material is the most brittle Stress 1 B 2 B' 3 B" A Strain A none of these B 2 (C) 1 D 3

Find the tensile toughness for a metal alloy with modulus of elasticity of 103 ???. Assume the plastic deformation begins at a strain value of 0.007 and fracture occurs at a strain value of 0.60. Assume also that fracture occurs at the point where necking begins and that the Κ and ? values are 1520 ??? and 0.15 respectively.

O The following engineering stress-strain data were obtained for a 0.2% C plain-carbon steel. (i) Plot the engineering stress-strain curve. (ii) Determine the ultimate tensile strength of the alloy. (iii) Determine the percent elongation at fracture. Engineering Engineering Engineering Engineering Stress Strain Stress Strain (ksi) (in./in.) (ksi) (in./in.) 76 0.08 30 0.001 75 0.10 55 0.002 73 0.12 60 0.005 69 0.14 68 0.010 65 0.16 72 0.020 56 0.18 74 0.040 51 0.19 75 0.060 (Fracture)

3. Calculate the tensile modulus (G) of a 1-cm poly(methyl methacrylate) (CAS# 9011-14-7) rod with a tensile stress of 69.1 MPa and an elongation of 2.6%.

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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…

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FRACTURE TOUGHNESS

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Thank you for answering this question. Please you specify each step as soon as possible. Good Luck! Thank you. Find the maximum biaxial stress,ox= -20, oy=-30, o > 0, that one can apply to a 60° lamina of glass/epoxy. Use maximum stress theory. Strength values of glass/epoxy: (6,Jult = 1062 MPa, (6,)ult= 610 MPa, (02)ult = 30 MPa, (o2Jult = 118 MPa, (T12)ult= 72 MPa