A.σ1=-10MPa,σ2=-10MPa,σ3=-20MPa
B.σ1=25MPa,σ2=25MPa,σ3=-50MPa
C.σ1=50MPa,σ2=25MPa,σ3=25MPa
D.σ1=25MPa,σ2=-25MPa,σ3=-50MPa
A.σ1=-10MPa,σ2=-10MPa,σ3=-20MPa
B.σ1=25MPa,σ2=25MPa,σ3=-50MPa
C.σ1=50MPa,σ2=25MPa,σ3=25MPa
D.σ1=25MPa,σ2=-25MPa,σ3=-50MPa
A brass bar (E = 110Mpa) of length L= 2.5 m has diameter= 18 mm over one-half of its length and diameter= 12 mm over the other half. Compare this nonprismatic bar to a prismatic bar of the same volume of material with constant diameter d and length L. The elongation of the prismatic bar under the same load P = 25 kN is approximately:
A、3 mm
B、4 mm
C、5 mm
D、6 mm
上下共4条焊缝)。
直径为d的圆截面钢杆处于水平面内,AB垂直于CD,铅垂作用力F1=2kN,F2=6kN,如图所示。已知d=7cm,材料[σ]=110MPa,用第三强度理论校核该杆的强度。
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