I am confused by the definition of the variation of the velocity gradient in the Abaqus Theory Manual (4.6.1).

Normally var(L) = var(grad(v)) = grad(var(v)); where var denotes the variational operator. But in the manual it is given as var(L) = grad(var(u)); where u is the displacement field.

Could someone explain how the definition in the Abaqus theory Manual came about? I have attached a screen capture of the specific part of the manual.

Thank You

Feby

Normally var(L) = var(grad(v)) = grad(var(v)); where var denotes the variational operator. But in the manual it is given as var(L) = grad(var(u)); where u is the displacement field.

Could someone explain how the definition in the Abaqus theory Manual came about? I have attached a screen capture of the specific part of the manual.

Thank You

Feby

## Comment