The principal stresses σ1, σ2 and σ3 at a point respectively are 80 MPa, 30 MPa and -40 MPa. The maximum shear stess is:

The principal stresses σ1, σ2 and σ3 at a point respectively a

1.	The principal stresses σ1, σ2 and σ3 at a point respectively are 80 MPa, 30 MPa and -40 MPa. The maximum shear stess is:
A.	60
B.	55
C.	35
D.	25
Answer» B. 55