课程名称︰材料力学
课程性质︰必修
课程教师︰刘建豪
开课学院：工学院
开课系所︰机械工程学系
考试日期（年月日）︰2016年6月22日
考试时限（分钟）：120分钟
试题 :
1.(20%) For the given state of stress, determie (a) the principle planes,
(b) the principal stresses.
http://i.imgur.com/VE1A2cH.jpg
2.(20%) The strains determined by the use of a rosette attached as shown
to the surface of a machine element are ε1 = -93.1×10^-6 mm/mm,
ε2 = +385×10^-6 mm/mm, ε3 = +210×10^-6 mm/mm. Determine (a)
the orientation and magnitude of the principle strains in the
plane of the rosette, (b) the maximum in-plane shearing strains.
(Hint: find εx, εy, γxy)
http://i.imgur.com/TrQ21JN.jpg
3.(20%) Explain why gas cylinders explore in radial direction instead of
in longitudinal direction.
http://i.imgur.com/gELgzB3.jpg
4.(20%) The solid shaft AB rotates at 600rpm and transimits 80kW from the
motor M to a machine tool connected gear F. Knowing that τall =
60MPa, determine the smallest permissible diameter of shaft AB.
http://i.imgur.com/vfiFGzP.jpg
5.(20%) For the cantilever beam and loading shown, determine (a) the
equation of the elastic curve for portion AB of the beam, (b) the
deflection at B, (c) the slope at B.
http://i.imgur.com/LYL8xMv.jpg
6.(20%) (a) Buckle occurs when tension or compression? (b) How to aviod
buckle (we talk three methods in class, answer one of them)?
http://i.imgur.com/dWXzdsi.jpg
考卷最末附上公式表：http://i.imgur.com/P7FRFMg.jpg