EGR 283 Quiz #8


All results must be given to the precision used in the textbook.  Assume that the data are known to the same precision.  Thus, when a value of 2 kips is given, it is assumed that it is known to 3 digits; i.e., 2.00 kips.  You may receive partial credit if you show your work (on the reverse).  The units requested must be given with all answers. Print this page and write the answers in the blanks.  Sign the statement at the bottom.  Then submit the page before class on Monday.

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1. The equations x-3 = r cosA and y+2 = r sinA are parametric equations of what geometric shape?
2. Suppose the element in Figure P7.61 (page 445) is subjected to a shearing stress of 50 MPa in the direction shown.  Is tau plotted above or below the normal stress axis?
3. For the same figure (problem 2), the center of Mohr's circle is plotted at what point on the normal stress axis?
4. To determine the principal values for in-plane stress, with two non-zero values given for the normal stresses in the x and y directions and zero normal stress in the z direction, and a non-zero shearing stress (tau-sub-xy), about which axis is the element rotated?
5. True or False?  Tresca's hexagon applies to ductile materials. (circle one) TrueFalse
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