# Hydrostatic stress on cube placed in deep sea

Ques: If one metal cube placed in deep sea where will be maximum shear stress in cube?

What I know: In hydrostatic condition there would be no shear stress, that means on any face of cube there would be not shear stress at all.
In case of two dimensional stress; if we have same normal stress on the sides and zero shear stress we cannot draw Mohr circle; that means we cannot have shear stress in any orientation.

My doubt: Whether it would same for three dimensional cube as in 2D case.

berkeman
Mentor
Ques: If one metal cube placed in deep sea where will be maximum shear stress in cube?

What I know: In hydrostatic condition there would be no shear stress, that means on any face of cube there would be not shear stress at all.
In case of two dimensional stress; if we have same normal stress on the sides and zero shear stress we cannot draw Mohr circle; that means we cannot have shear stress in any orientation.

My doubt: Whether it would same for three dimensional cube as in 2D case.
Hi Ravi, Is this question for schoolwork?

Chestermiller
Mentor
Ques: If one metal cube placed in deep sea where will be maximum shear stress in cube?

What I know: In hydrostatic condition there would be no shear stress, that means on any face of cube there would be not shear stress at all.
In case of two dimensional stress; if we have same normal stress on the sides and zero shear stress we cannot draw Mohr circle; that means we cannot have shear stress in any orientation.

My doubt: Whether it would same for three dimensional cube as in 2D case.
It's the same for 3D. The stress tensor will be isotropic, and the stress vector on an arbitrary plane of any orientation through the cube will be normal to the plane. There will be no shear stress.

Ravi Singh choudhary
Hi Ravi, Is this question for schoolwork?
No this was once asked in BARC interview for mechanical engineers

It's the same for 3D. The stress tensor will be isotropic, and the stress vector on an arbitrary plane of any orientation through the cube will be normal to the plane. There will be no shear stress.
Thanks sir.