When does stress concentrations become important?

What is the effect of strain hardening on the material?

2) a) Draw a stress-strain curve for a low carbon steel and an aluminum after tensile test. Show important points and regions on this curve and explain these points and regions.

8. Design Problem: A material is needed to support a hanging sculpture with an overall tensile load of 800 N. It is important that the material not undergo any permanent deformation under this load and must have minimum volume/diameter. Using a circular rod, design structural components using your data for each of the three materials. Which material would you choose for the application and why? If the requirement was minimum weight, rather than minimum volume, which material would you use? Show sample calculations.

Unless indicated otherwise, each 1. Describe the three phases of the life history curve. Draw the curve and label it in detail (the axes, phases, type of product failure, etc.).

With what is Stress associated and how?

For each of the heat treatments and processes below, explain what the process is, how it affects the structure, properties and behaviour of the parent material. A) solution heat treatment of Aluminium/ Copper alloys  B) chemical vapour deposition on semiconductor materials  C) Hot forging of steels

Metal working: What is happening to the microstructure during the temper process?

Why are pairs of materials more likely to experience thermal stress problems when they represent two different material classes?

I. List the importance of the impact test and limitations. II. Which material (i.e., C1045-CF, Cast Iron, AL7075-T6) was more ductile? Explain the effect of carbon content and finishing process on ductility. II. How did temperature affect the toughness of the specimens? IV. Based on these results, which material would be better to use for constructing an earthquake resistant structure? Explain. V. The following picture shows Charpy fracture surfaces of a material with different initial temperatures, after testing. Which of these figures, i.e., (a) to (e), is related to the lowest temperature? Explain. (d)