12、 A bar made of A-36 steel has the dimensions shown in Figure 12. An axial force P= 80kN is
applied to the bar, the young’s modulus for A-36 steel is E=200 GPa and the bar material
behaves elastically, which of the following is correct?
(A) the axial elongation is 100 μm,
(B) the axial elongation is 120 μm,
(C) change of the wide dimension is 3.67 μm,
(D) change of the height dimension is 2.56 μm.
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