已知一点处的应力状态如图所示,单位为MPa,其主应力为()
A: =50MPa,=0,=-40MPa
B: =50MPa,=40MPa,=0
C: =40MPa,=0,=-40MPa
D: =50MPa,=40MPa,=-40MPa
A: =50MPa,=0,=-40MPa
B: =50MPa,=40MPa,=0
C: =40MPa,=0,=-40MPa
D: =50MPa,=40MPa,=-40MPa
举一反三
- 已知一点处的应力状态如图所示,单位为MPa,其主应力为() [img=160x130]17e0b213a8be3d0.jpg[/img] A: σ1=50MPa,σ2=0,σ3=-40MPa B: σ1=50MPa,σ2=40MPa,σ3=0 C: σ1=40MPa,σ2=0,σ3=-40MPa D: σ1=50MPa,σ2=40MPa,σ3=-40MPa
- 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
- 已知一点处的应力状态如图所示,单位为MPa,其主应力为()[img=144x116]17e0ad407a26f79.jpg[/img] 未知类型:{'options': ['17e0a6f8e9614ed.png=50MPa,[img=19x21]17e0ad408d2e2ef.png[/img]=0,[img=19x21]17e0a6f8f26d37e.png[/img]=-40MPa', ' [img=17x21]17e0a6f8e9614ed.png[/img]=50MPa,[img=19x21]17e0ad408d2e2ef.png[/img]= 40MPa,[img=19x21]17e0a6f8f26d37e.png[/img]=0', ' [img=17x21]17e0a6f8e9614ed.png[/img]=40MPa,[img=19x21]17e0ad408d2e2ef.png[/img]= 0,[img=19x21]17e0a6f8f26d37e.png[/img]=-40MPa', ' [img=17x21]17e0a6f8e9614ed.png[/img]=50MPa,[img=19x21]17e0ad408d2e2ef.png[/img]= 40MPa,[img=19x21]17e0a6f8f26d37e.png[/img]=-40MPa'], 'type': 102}
- 某点应力状态所对应的应力圆如下图所示。C点为圆心,应力圆上点A所对应的正应力σ和剪应力τ分别为 ( ) 。[img=630x509]1803be4a7cdc17c.png[/img] A: σ=0,τ=200 MPa B: σ=0,τ=150 MPa C: σ=50 MPa,τ=200 MPa D: σ=50 MPa,τ=150 MPa
- 中国大学MOOC: 材料相同的两个单元体a和b ,单元体a截面上的主应力分别为40MPa,80 MPa, 0;单元体b的主应力分别为150MPa, 50 MPa,-80 MPa,这两个单元体的体积应变θa和θb的关系是 。