A metallic rod, characterised by a gauge length of 150 mm and a diameter of 20 mm, undergoes uniaxial tensile testing to

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A Metallic Rod Characterised By A Gauge Length Of 150 Mm And A Diameter Of 20 Mm Undergoes Uniaxial Tensile Testing To 1 (73.42 KiB) Viewed 6 times

A metallic rod, characterised by a gauge length of 150 mm and a diameter of 20 mm, undergoes uniaxial tensile testing to failure. The loading direction is parallel to the main axis of the rod, and the Poisson's ratio of the material is 0.33. Yielding is observed when an applied force of 55 kN is reached, for an engineering strain along the loading direction of 0.2%. Calculate: (a) The Young's modulus of the material. (b) The length and the diameter of the rod at yielding. (c) The elastic energy per unit volume and the total stored elastic energy in the specimen. (d) Explain why dislocations move on specific crystal slip systems and how this is defined? (e) Define Griffith's criteria for measuring a materials toughness. (f) What thermally activated process gives rise to the glass transition temperature in polymers? (4 marks) (4 marks) (4 marks) (3 marks) (3 marks) (2 marks)