Assignment
Q1. Stress strain diagram of a material is given in Figure after tensile testing was performed. The specimen has an initial diameter of 10 mm and an initial gauge length of 50 mm.
By using the provided diagram, determine the following
(i) The modulus of elasticity of the material
(ii) The Yield Strength
(iii) The maximum stress in the elastic region
(iv) The allowable stress with a safety factor of 1.1
(v) The ultimate strength of the material
(vi) The ductility of the materials
(vii) The energy generated for the elastic deformation
Q2. Creep is a continued increase in the strain of material with time under action of constant stress and it can be performed under different environmental temperatures. Complete figure 1 and explain briefly the effect of the temperature and the stress on the strain behaviour of metal materials.
