Chapter 12, Problem 26P

6.(单选题) The DOF of the following mechanism is E A F=3x4-2x5-0=2 B F=3x3-2x4-0=1 F=3x3-2x3-2=1 D F=3x4-2x5-1=1

3. (计算题) Calculate the DOF of the following mechanism (a)唧筒机构

5. (计算题) Calculate the DOF of the following mechanism D A B E

4.(计算题) Calculate the DOF of the following mechanism wwwww التحفة www

VIMA

1. Calculation Calculate the DOF of the following mechanis m 2 3 1 Please enter the answer

a) Determine state of stress at all points (a, b and c). These points are located on the exteriorsurface of the beam. Point a is located along the centreline of the beam, point b is 15mmfrom the centreline and point c is located on the edge of the beam. Present yourresults in a table and ensure that your sign convention is clearly shownb) Construct Mohrs circle at this point andcalculate the principal stresses and maximum in‐plane shear stress (τmax) at pointc. sketch the resulting state of stress at this point clearly indicating themagnitude of the stresses and any angles associated with the state of stress (principal ormaximum in‐plane shear).

parts e,f,g

Figure 9-6 9-49 An aluminum alloy plate with dimensions 20 cm x 10 cm × 2 cm needs to be cast with a secondary dendrite arm spacing of 10-2 cm (refer to Figure 9-6). What mold constant B is required (assume n = 2 )? Secondary dendrite arm spacing (cm) - 10-1 10-2 10-3 10 41 0.1 1 Copper Zinc alloys Aluminum alloys 10 100 1,000 10,000 100,000 Solidification time (s)