2、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=455x188]1803d6165870832.png[/img]
A: γ=1/3, σa=160MPa, σm=80Mpa
B: γ=1/3, σa=80MPa,σm=160Mpa
C: γ=3, σa=80MPa, σm=160Mpa
D: γ=3, σa=160MPa, σm=80MPa
A: γ=1/3, σa=160MPa, σm=80Mpa
B: γ=1/3, σa=80MPa,σm=160Mpa
C: γ=3, σa=80MPa, σm=160Mpa
D: γ=3, σa=160MPa, σm=80MPa
举一反三
- 图示某危险点的应力状态,其主应力[img=17x17]1802d1d0a26b7ea.png[/img]和最大切应力[img=33x17]1802d1d0aaf4fad.png[/img]为( )。[img=148x135]1802d1d0b624ea8.jpg[/img] A: 130 MPa, 80 MPa B: 120MPa,30 MPa C: 150MPa,60 MPa D: 140 MPa,, 80MPa
- 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
- 图示点的应力状态,应力的单位为MPa,其主应力、最大切应力是() [img=171x176]17e0ad40bd6e004.jpg[/img] A: σ1=80MPa,σ2=54.2MPa,σ3=-44.2MPa,τmax=62.1MPa B: σ1=54.2MPa,σ2=-44.2MPa,σ3=80MPa,τmax=62.1MPa C: σ1=80MPa,σ2=54.2MPa,σ3=-44.2MPa,τmax=49.2MPa D: σ1=54.2MPa,σ2=-44.2MPa,σ3=80MPa,τmax=49.2MPa
- 某单元体的三个主应力分别为-50MPa,60MPa,80MPa,最大切应力的数值为( )。 A: 70 MPa B: 45 MPa C: 65 MPa D: 20MPa
- 原油压缩系数单位是()。 A: kg/m<sup>3</sup> B: MPa C: MPa~1 D: MPa•s