RelDisp

Relative Displacement

In the governing equation,

$$\mathbf{K}\cdot \mathbf{\Delta }\mathbf{U}\mathbf{=}\mathbf{R},$$

this converger tests the following ratio,

$${\displaystyle \frac{{\left|\mathbf{\Delta }\mathbf{U}\right|}_{\mathrm{\infty }}}{{\left|\mathbf{U}\right|}_{\mathrm{\infty }}}}⩽tol.$$

where $\mathbf{\Delta }\mathbf{U}$ denotes the displacement increment of the current sub-step and $\mathbf{U}$ denotes the total displacement of the system.