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ENT 153 TUTORIAL 1
Problem 1: The bar in Fig. 1 (a) has a constant width of 35 mm and a thickness of 10 mm.
Determine the maximum average normal stress in the bar when it is subjected to the loading
shown.
Note: Fig. 1 (b) shows the internal loadings of the members which are sectioned.
Fig. 1 (c) shows the normal force diagram representing the above results graphically.
These figures are not given in test or examination.
Problem 2: The 80-kg lamp is supported by two rods AB and BC as shown in Figure 2 (a). If AB has
a diameter of 10 mm and BC has a diameter of 8 mm, determine the
average normal stress in each rod.
Fig. 2
Problem 3: The casting shown in Figure 3 (a) is made of steel having a
specific weight of γst = 80 kN/m3. Determine the average
compressive stress acting at points A and B.
Fig. 3
Problem 4: Member AC shown in Fig. 4 (a) is subjected to a vertical force of 3 kN. Determine the
position x of this force so that the average compressive stress at the smooth support C is equal
to the average tensile stress in the tie rod AB. The rod has a cross-sectional area of 400 mm2
and the contact area at C is 650 mm2.
Fig. 4
Problem 5: The bar shown in Fig. 5 (a) has a square cross section for which the depth and
thickness are 40 mm. If an axial force of 800 N is applied along the centroidal axis of the bar’s
cross-sectional area, determine the average normal stress and average shear stress acting on
the material along (a) section plane a-a and (b) section plane b-b.
Fig. 5
• Problem 6.
• Problem 7:
• The small block (Fig. 1) has a thickness of 5
mm. If the stress distribution at the support
developed by the load varies as shown,
determine
– the force F applied to the block, and
– the distance d to where it is applied.
•
•
Fig. 1