(a)  Make an S–N plot (stress amplitude versus logarithm cycles to failure) using these data.                (b)  What is the fatigue limit for this alloy?                (c)  Determine fatigue lifetimes at stress amplitudes of 415 MPa (60,000 psi) and 275 MPa (40,000 psi).                (d)  Estimate fatigue strengths at 2 × 104 and 6 × 105 cycles.

Determine the material property of the materials from the following website. Material Property Data (www.matweb.com) e Material: Carbon Steel C1045 (AISI 1045) Cold Drawn 1 in. round Property: Ultimate Tensile Strength (psi) 49,900

Ductility (%EL) 70 60 50 40 30 20 10 Brass 1040 Steel 10 Copper 20 30 40 50 Percent cold work 60 70 Percent cold work = 0 Ductility = 0

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Identify the main properties trend (grain size, ductility, strength, hardness) of metal alloys as a percent of cold work on the diagram below.

1. For the stress-strain curve shown below, please estimate the properties indicated. (a) Fracture Strain Please do your work on a separate sheet of paper, and put your answers in the boxes on the right. Be sure to include the proper symbol and units. Stress Strain 70 60 50 Stress (ksi) 240 30 20 10 70 0 0.000 60 50 Stress (ksi) 40 20 10 KULL 0 0.000 0.010 0.050 0.100 Strain (in/in) Stress Strain 0.020 0.030 Strain (in/in) 0.040 0.150 0.050 (b) Ultimate Tensile Stress (c) Fracture Stress (d) Proportional Limit (e) Elastic Modulus (1) Yield Stress (g) Tensile Toughness (Modulus of Toughness) (h) Modulus of Resilience

How did temperature affect the toughness of the specimens?

Question 2 Figure 2 shows the dependence of fatigue strength on testing cycles (S-N curve) of an acetal polymer. 60 50 40 30 20 10 104 105 106 107 108 Number of cycles to failure Figure 2 The S-N fatigue curve for an acetal polymer a. What is the fatigue strength, or maximum stress amplitude, at one million cycles of loading? b. An acetal polymer 30-cm-long bar with a diameter of 20 mm is designed to survive one million cycles of loading, what is the maximum allowable axial load that can be applied on one end of the bar? Magnitude of stress Reversal, MPa

Q1. (i) Initial strain Please enter your supplied question data Q1. (ii) Eo B (hr¹Pa-¹) n IVICUITO Fracture 0.003 Please enter your answers here Your Q1. (i) Answers: 4.60E-34 Q1. (ii) 3.2 Q2. o (Pa) σo (Pa) 780,000,000 Q3. t (hr) Q2. A component is made from a metal that is known to be viscoelastic and behaves according to a secondary creep rate equation with constants of B and n provided as your input values. If the component is subjected to a constant force that results in the initial strain of E provided to you, determine the design stress for a secondary creep life of 1,000 hrs before attaining a limiting strain, &, of 0.01. Q3. If the same component is subjected to a constant displacement that results in the value of initial stress, o, provided to you, calculate the time for the stress to reduce to 200MPa. Young's modulus of the bolt is E = 200GPa.

The yield strength for an alloy that has an average grain diameter of 5.9 x 10-2 mm is 148 MPa. At a grain diameter of 7.8 × 10-³ mm, the yield strength increases to 233 MPa. At what grain diameter, in mm, will the yield strength be 247 MPa? d = i mm