已知平面应力状态下某点处的两个方向面上的应力如图11-6a所示。试求该点处的三个主应力大小。[img=330x269]1803c0be5e65878.png[/img]
A: 114.72MPa, 25.28MPa,0
B: 25.28MPa,0,-114.72MPa
C: 114.72MPa, 0, -25.28MPa
D: 0, -25.28MPa, -114.72MPa
A: 114.72MPa, 25.28MPa,0
B: 25.28MPa,0,-114.72MPa
C: 114.72MPa, 0, -25.28MPa
D: 0, -25.28MPa, -114.72MPa
举一反三
- 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
- 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=1313x740]17de93bacdcd6dd.jpg[/img] A: (A)σ=0,τ=200 MPa; B: (B)σ=0,τ=150 MPa; C: (C)σ=50 MPa,τ=200 MPa; D: (D)σ=50 MPa,τ=150 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
- 单元体上三个主应力的大小分别为100MPa,0,-100MPa,则单元体最大切应力数值应为 A: 100 MPa B: 0 MPa C: 50 MPa D: 70MPa
- 一点处于平面应力状态, a-a平面上和b-b平面上的应力如图所示。则该点的最大主应力值为( )[img=655x473]1802d891a088e33.jpg[/img] A: 78.1 MPa B: 80.2 MPa C: 82.9 MPa D: 83.7 MPa