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Unformatted text preview: Name ____________________________ S ECOND H OUR E XAMINATION- TAM 324/CEE300 Wednesday March 7, 2007 • Work all problems in spaces provided • One page of hand-written notes permitted. 1. (15 points) Assume a single-crystal BCC material. (a) (5pts) Sketch the BCC crystal unit cell and identify an origin. (b) (5pts) Identify a slip system (provide both planar and direction indices to define the system) that is most likely to experience slip under general loading; (c) (5pts) Identify a direction such that uni-axial tension applied along it will not cause any slip along that identified slip system. A 2 (20 points) Consider the five stress-strain curves, shown below, obtained from uni-axial tension tests on five different materials. The left plot shows the full range of data, and the right plot a reduced range of the same test data. Using the letters that indicate each curve, (a) (2pts ) identify the strongest material and briefly justify your choice; (b) (2pts) identify the toughest material and briefly justify your choice; (c) (2pts) predict which material will be “notch sensitive” and briefly justify your choice; (d) (2pts) predict which material will exhibit highest hardness and briefly justify your choice; (e) (3pts) identify which material is most likely 1045 normalized steel and...
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This note was uploaded on 04/07/2008 for the course CEE 300 taught by Professor Popovics during the Fall '07 term at University of Illinois at Urbana–Champaign.
- Fall '07