Name:_______________
4-3-2015
ME2570. Mechanics of Materials – TEST No. 3
1. A cantilevered I–beam is subjected to a 2500 N transverse force as
shown. Determine the maximum tensile stress in the beam and its
location. (35 pts.)
ME2570 Mechanics of Materials. 3rd Test
4–3–2015
2. A channel–shaped cross–section is fabricated with three boards
that are nailed together as shown. If the beam is subjected to a
shear force V = 200 lb and the space between nails is 5 in., what is
the shear force carried by each nail? (35 pts)
ME2570 Mechanics of Materials. 3rd Test
2
4–3–2015
3. Determine the maximum shear stress in the cross-section shown when it is
subjected to a shear force of 30 kN. (30 pts.)
ME2570 Mechanics of Materials. 3rd Test
3
4–3–2015
Equation-sheet Third Test
=−
=−
= + =
= !
=
!
=
+
= − + =
+ "# $ −2 '(2* =
− =
Σ = 0Σ = 0
Additional relations:
Theorem of parallel axis:
+
+
2
+
2
+,!,+.
+
−
ME2570 Mechanics of Materials. 3rd Test
−
2
!
=
−
2
=
+
2
!
+ "%̅ ̅
± 01
cos 2 −
cos 2 +
− $
2 +
2
$
2
2
4