课程名称︰材料力学
课程性质︰必修
课程教师︰朱锦洲
开课学院：工学院
开课系所︰化学工程学系
考试日期（年月日）︰103/10/21
考试时限（分钟）：90分钟
试题 :
2014 Fall 化工系材料力学第一次期中考试题 2014-10-21
1. 解释及说明:(25)
(a) Mechanics of material？ (6)
(b) Normal stress and shear stress (5)
(c) Plane stress (5)
(d) Two-force member (4)
(e) Statically indeterminate problem (5)
2. A three-bar member is shown in Fig.2 (30: 10, 12, 8)
(a) Determine the reaction in supports A and E.
(b) Find the acting forces in members ABC and ADE, respectively.
(c) Find the internal forces on section a-a in bar ABC and section b-b in
bar respectively.
http://ppt.cc/Q6Z4
3. At a point in a structural member subjected to normal and shear stresses on
horizontal and vertical planes as shown in Fig.3. (35: 15, 10, 10)
(a) Determine and show on a sketch, (i) the principal stresses, (ii) the
maximum shearing stress and (iii) the maximum in-plane shearing stress
at the point. (15)
(b) Determine and show on a sketch, the normal and shear stresses at this
point on the inclined plane a-b at the point. (10)
(c) Use Mohr's circle to verify your answers in (a) and (b). (10)
http://ppt.cc/oI6p
4. The inclined member AB of a timber truss is framed into a 4x6-in. bottom
chord as shown in Fig. 4. Determine (a) the compressive force in member
AB when the average shearing stress parallel to the grain at the end of the
bottom chord is 225 psi. (b) the applied load F at pt. B. (20: 10, 10)
http://ppt.cc/oLdQ