题目内容
(请给出正确答案)
[主观题]
图示单元体中应力单位为MPa,则其三个主应力为: A.120,40,-30 B.120,30,-30 C.130,30,-30 D.80
图示单元体中应力单位为MPa,则其三个主应力为:A.120,40,-30 B.120,30,-30 C.130,30,-30 D.80,50,-50
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图示单元体中应力单位为MPa,则其三个主应力为:A.120,40,-30 B.120,30,-30 C.130,30,-30 D.80,50,-50
【题目描述】
图示单元体中应力单位为MPa,则其三个主应力为:
A.120,40,-30
B.120,30,-30
C.130,30,-30
D.80,50,-50
请大师指点指点
A.-85
B.85
C.-75
D.75
A.-85
B.85
C.-75
D.75
A.σ1=80Mpa,σ2=60 Mpa,σ3=0,τσmax=40 MPa
B.σ1=60 MPa,σ2=0,σ3=-80 MPa,τmax=70 MPa
C.σ1=-80 MPa,σ2=0,σ3=60 MPa,τmax=-70 MPa
D.σ1=60 MPa,σ2=-80 MPa,σ3=0,τmax=60 MPa
A.主应力大小和方向均相同
B.主应力大小和方向均不同
C.主应力大小不同,但方向相同
D.主应力大小相同,但方向不同