Question 4 15 pts An aluminium container is to be produced by back extrusion of an...
Question 4 15 pts An aluminium container is to be produced by back extrusion of an annealed billet using a suitable lubricant. The final true strain (€) is calculated to be exactly 2.5. Assume that the material strain hardens according to k = 136 Mpa, and n = 0.16. Estimate the extrusion pressure (p) using the following equation. Give your answer to 1 decimal place in MPa. p=0fm. (0.8 +1.4.Ej) Question 5 15 pts A hollow scaffolding tube of 53 mm outer diameter and 3.1 mm wall thickness is to be produced by extrusion of an annealed slug 75 mm in diameter using a suitable lubricant. Calculate the true strain to 2 decimal places.