1、图示交变应力循环特征γ,应力幅σa和平均应力σm分别为 。[img=452x193]1803d6164dc59ec.png[/img]
A: γ=2, σa=20MPa, σm=-10Mpa
B: γ=2, σa=-40MPa,σm=10Mpa
C: γ=-2, σa=30MPa, σm=-10Mpa
D: γ=-2, σa=30MPa, σm=30MPa
A: γ=2, σa=20MPa, σm=-10Mpa
B: γ=2, σa=-40MPa,σm=10Mpa
C: γ=-2, σa=30MPa, σm=-10Mpa
D: γ=-2, σa=30MPa, σm=30MPa
举一反三
- 图示交变应力循环特征γ,应力振幅σa和平均应力σm分别为() A: γ=2,σ=20MPa,σ=-10Mpa B: γ=2,σ=-40MPa,σ=10Mpa C: γ=-2,σ=30MPa,σ=-10Mpa D: γ=-2,σ=30MPa,σ=30MPa
- 图示交变应力循环特征γ,应力振幅σa和平均应力σm分别为() A: γ=2,σ=20MPa,σ=-10Mpa B: γ=2,σ=-40MPa,σ=10Mpa C: γ=-2,σ=30MPa,σ=-10Mpa D: γ=-2,σ=30MPa,σ=30MPa
- The average stress σm and stress amplitude σa of the alternating stress in the figure are respectively ( ).[img=239x154]17de8405f43ce66.jpg[/img] A: σm = 40MPa,σa = -120 MPa B: σm = -40MPa,σa = -40 MPa C: σm = 0MPa,σa = 120 MPa D: σm = -40MPa,σa = 80 MPa
- 呼吸机工作压力() A: 10MPa B: 1 MPa C: 0.3-0.5 MPa D: 0.1 MPa
- 图中所示为一平面应力状态,[img=28x19]1802d891686c412.png[/img]截面上的正应力和切应力分别为( )[img=598x444]1802d89176bc4ee.jpg[/img] A: 52.7 MPa, -30.8 MPa B: 52.7 MPa, -31.8 MPa C: 49.7 MPa, -34.8 MPa D: 49.7 MPa, -33.8 MPa