stress-strain curve, including calculations to show how the Young’s Modulus

Explain with the aid of a diagram the main features of a stress-strain curve, including calculations to show how the Young’s Modulus is found. Use your diagram to describe the differences between ductile and brittle failure, giving your own examples to demonstrate subject understanding and including suitable calculations. Using diagrams also describe the following mechanical tests (impact tests, tensile tests and hardness tests) and explain the material properties they measure. You are expected to engage with the body of knowledge and to provide suitable references where appropriate.