A round billet made of copper was extruded at a temperature of 500C0 the billet diameter was 100 mm, and the final extruded (hollow )shape and dimensions are shown in the figure. Extrusen constat k tor varon metas at derent temperatures "C estimate the extrusion forceicquired. 1000 1200 1400 800 600 400 80 Stainless steel Beryllium 400 70-30 Brass 200 Cold-rolled Соррer steel 40 20 1100 Aluminum 2500 2000 1500 1000 Temperature ("F) 60 Chromiu Molybdenum Extrusion constant, k(10 psi) 60 mm MPa

Ductility (%EL) 70 60 50 40 30 20 10 Brass 1040 Steel 10 Copper 20 30 40 50 Percent cold work 60 70 Percent cold work = 0 Ductility = 0

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Tag question Consider the graph below for 3 metals which have been cold-worked. From the graphs, which of the following statements are true? Stress Select one or more: a. C. Strain & A e. B C b. B and C have similar hardness; C has greater brittleness B is softer than C and has nearly similar ductility A is harder than C and is more ductile d. A and B have similar hardness; A has greater brittleness A is harder than C and is less ductile f. B is harder than C but has nearly similar ductility 5 up i A C

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Question 1 You are working on a design team at a small orthopaedic firm. You have been asked to select a cobalt- chrome-molybdenum (CoCr) material that will not experience plastic deformation under a specific mechanical test, as follows... A tensile stress is applied along the long axis of a solid cylindrical rod that has a diameter of 10 mm. An applied load of some magnitude F produces a 7x10-³ mm change in diameter (see figure below, original shape is blue, elongated shape is unshaded). Q1A-B: Calculate the transverse strain in the x-direction (Ex) associated with the reduction in diameter. Calculate the axial strain in the z-direction (₂) associated with the length increase.

3. A cylindrical specimen of cold-worked copper has a ductility, %EL. If its cold-worked radius is d, what was its radius before deformation? Use %EL=25%; d = 10mm Ductility (%EL) 70 60 50 40 30 20 Brass 1040 Steel 10 Copper 0 0 10 110 20 30 40 50 60 70 Percent cold work