The main real parameters of the problem are specified in the name.i1 file on the RP line:
RP CRIT SCALE THDEF XL XU YL YU ZL ZU ALPHA $A$ $I_k$ $W_k$ $I_\eta$ $W_\eta$ $I_\zeta$ $W_\zeta$ $p_x$ $p_y$ $p_z$
| $\mathtt{CRIT}$ | The criterion for checking the Jacobians, i.e., the degree of element distortion. A suitable value is $1\le\mathtt{CRIT}\le2.5$, and for strongly (but still acceptably) distorted elements it may be up to $4$. | |
|---|---|---|
| $\mathtt{SCALE}$ | The scale factor for node coordinates and element thicknesses. | |
| $\mathtt{THDEF}$ | The default thickness value for planar elements and shell elements. It applies when the nodal thicknesses are not specified in the element description. The default value is $\mathtt{THDEF}=1$. | |
| $\mathtt{XL},\mathtt{XU}$ $\mathtt{YL},\mathtt{YU}$ $\mathtt{ZL},\mathtt{ZU}$ | The coordinates of the bounding box $(\mathtt{XL},\mathtt{XU})\times(\mathtt{YL},\mathtt{YU})\times(\mathtt{ZL},\mathtt{ZU})$ circumscribing the body without touching it. Used to check the input data. The default values are $\mathtt{XL}=\mathtt{YL}=\mathtt{ZL}=10^{-10}$, $\mathtt{XU}=\mathtt{YU}=\mathtt{ZU}=10^{10}$. | |
| $\mathtt{ALPHA}$ | The angle between the periodicity surfaces $[^\circ]$ (for $\mathtt{KPER}=1$). | |
The parameters from position 11 onward are optional and represent the default values of the cross-sectional properties of line elements. They apply when the cross-sectional properties are not specified in the description of a line element.
The Jacobian value is acceptable if $$\frac{1}{\mathtt{CRIT}}\le\frac{J_\mathtt{IG}}{J_\varnothing}\le\mathtt{CRIT},$$ where $J_\varnothing=\frac{\sum_{\mathtt{IG}=1}^\mathtt{NIG}J_\mathtt{IG}}{\mathtt{NIG}}$ is the average Jacobian value for the checked element, $J_\mathtt{IG}$ is the Jacobian value at the $\mathtt{IG}$-th integration point, and $\mathtt{NIG}$ is the number of integration points on the element. If the element is rectangular, $\frac{J_\mathtt{IG}}{J_\varnothing}=1$.
Note
The RP line must be the second non-empty line in the input file (the first is the IP line). Lines containing only a comment are also considered empty lines.
Note
The RP line can have any number of continuation lines. Data are written from column 3 to column 72 (the first two columns are generally reserved for two-letter batch names), see the Reference Manual.