[試題] 100上 王安邦 材料力學 第一次期中考
課程名稱︰材料力學
課程性質︰必修
課程教師︰王安邦
開課學院：工學院
開課系所︰化工系
考試日期（年月日）︰2012/10/23
考試時限（分鐘）：70分鐘
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
problem 1(20%)
a teddy bear is standing on a chair in the figure P1.the force exerted by the
teddy bear on the frame at one side of the chair is equivalent to horizontal
and vertical forces of 48N and 168N,respectively, at E and a force of 56N
perpendicular to member BH at G
(a)show the free-body diagram(10%)
(b)determine the intermal forces on a sectin perpendicular to and midway
between pins D and F(10%)
圖 http://ppt.cc/230E
problem 2(30%)
at a point in a structural member subjected to plane stress there are normal
and shear stresses on horizontal and vertical planes through the point, as
shown in the figure P2 (Using Mohr's circle)
a.determine the principal stresses and the maximum shear stress at the point.
show these stresses on a triangular stress element(15%)
b.determine the normal and shear stresses on the inclined plane a-b shown in
the figure. show these stresses on a sketch of the plane on which they act.
(15%)
圖 http://ppt.cc/3c8E
problem 3(25%)
at rigid bar FEBC is supported by two steel deformable bars AB and DE, as
shown in figure3. there is no strain in vertical bars before the load P is
applied. after the load is applied,the strain in bar DE is 0.0006in/in
determine
a.the axial strain in bar AB(8%)
b.the axial strain in bar AB if there is a 0.001-in. clearance in the connection
at B before the load is applied(10%)
c.the axial strain in bar AB if the clearance becomes 0.06in(7%)
圖 http://ppt.cc/rAIL
problem 4(25%)
the strain rosette on the free surface of an impression cylinder of a
precision coating machine for OLED electronics devices(v=0.33,shown in the
figure below)was used to obtain the following normal strain data:εa=+800μin/in
εb=+950μin/in,εc=+600μin/in
a.determine the principal strains and the maximum shearing strain at the point
.prepare a sketch showing all of these strains.(15%)
b.determine the normal strain in the n-direction at the point.(10%)
圖 http://ppt.cc/EcD~
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10/30 18:01, , 1F
10/30 18:01, 1F