CPYRA Element Checks and Default Bound Values

CPYRA 1st-order (5-noded) Element Checks

The following qualities of the CPYRA 1st-order element are checked:

•	Aspect Ratio

The aspect ratio of a CPYRA 1st-order element is defined as the maximum of the aspect ratios of its four triangular faces and the quadrilateral base face. Each triangular face is treated as a CTRIA3 element and the quadrilateral face as a CQUAD4 element.

•	Face Skew Angle

The face skew angle of a CPYRA 1st-order element is defined as the maximum of the skew angles of its four triangular faces and the quadrilateral base face. Each triangular face is treated as a CTRIA3 element and the quadrilateral face as a CQUAD4 element.

•	Vertex Angle

The same vertex angle check is performed for all of the faces, and each is treated as a triangular (CTRIA3) or quadrilateral (CQUAD4) element. The minimum and maximum values reported for the element.

•	Face Warpage

The face skew angle of a CPYRA 1st-order element is defined as the warpage of its quadrilateral base face, which is treated as a CQUAD4 element.

CPYRA 2nd-order (13-noded) Element Checks

The following qualities of the CPYRA 2nd-order element are checked:

•	Aspect Ratio

This quality is calculated using only the corner nodes. Its definition is the same as that used for the CPYRA 1st-order element.

•	Face Skew Angle

This quality is calculated using only the corner nodes. Its definition is the same as that used for the CPYRA 1st-order element.

•	Vertex Angle

This quality is calculated using only the corner nodes. Its definition is the same as that used for the CPYRA 1st-order element.

•	Face Warpage

This quality is calculated using only the corner nodes. Its definition is the same as that used for the CPYRA 1st-order element.

•	Hoe Normal Offset

The hoe normal offset is the maximum of its edges normal offset values. See the definition of hoe normal offset of 3-node edge.

•	Hoe Tangent Offset

The hoe tangent offset is the maximum of its edges tangent offset values. See the definition of hoe tangent offset of 3-node edge.

CPYRA Default Bounds

Information	Default values for warning message		Default values for error message		Default values for validity check
Information	Lower Limit	Upper Limit	Lower Limit	Upper Limit	Lower Limit	Upper Limit
Aspect Ratio	-	100.0	-	1000.0	-	1.0E5
Skew Angle	-	60.0	-	75.0	-	90.0
Face Warp Angle	-	30.0	-	60.0	-	180.0
Hoe Normal Offset	-	0.30	-	0.60	-	1.0E5
Hoe Tangent Offset	-	0.20	-	0.25	-	0.5

The values used for warning and error checks may be adjusted by the ELEMQUAL bulk data entry, but validity checks are hard-coded.