materials and environment

4) Mechanical properties of materials (10p) a) Draw schematically a tensile test curve for a metal. Explain how we can get data for modulus of elasticity, yieid strength and elongation at break from the tensile test curve. b) What is the difference between engineering stress/strain and the true Istress/strain in a material under load. Feel free to draw to support your explanation. c) Explain what the difference between a ductile and a brittle fracture in a material is. Show how one crime occurs (what hanoens in the material and which leads to the crime). It's fine to draw for 4) Mechanical properties of materials (10p) a) Draw schematically a tensile test curve for a metal. Explain how we can get data for modulus of elasticity, yieid strength and elongation at break from the tensile test curve. b) What is the difference between engineering stress/strain and the true Istress/strain in a material under load. Feel free to draw to support your explanation. c) Explain what the difference between a ductile and a brittle fracture in a material is. Show how one crime occurs (what hanoens in the material and which leads to the crime). It's fine to draw for