Question

There are 2 questions here. The first picture is the diagram used for both questions.

Questions 2 and 3 pertain to either 2024-T4 aluminum alloy used for lightweight automobile components or a 1308 titanium alloy used in nuclear attack submarines. The S-N endurance data (50% survival) for the alloys is shown below. Their tensile strengths are 70,000 psi and 155,000 for aluminum and titanium respectively 120 T 3100 O 80 60 D 40 Aluminu g 20 103 104 105 106 107 108 Cycles to Failure

Answer 1