Given a Monef 400 nickel alloy rectangular hollow tube, with dimensions: 10mm X 8mm (wall thickness is 2mm) and 1 m long at 27 °C, that is to be heat treated in a furnace at 100°C for 72 hours consider the questions below. Without noticing, the furnace is also only one meter deep (which impinges on the bar after closing the door of the furnace). Answer the following issues concerning this bar: (a) What would the “free expansion” of the bar have been had it not been constrained in the ‘too small’ furnace? (see www.MatWeb.com for properties); (b) What would the compressive stress be in the tube in the constrained furnace situation actually used?; (c) what is this level of true stress in the tube?

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