Check

Description

Aspect Ratio

ratio1 = V1/H1

ratio2 = V2/H2

Skew value is larger of ratio1 or ratio2.

Skew

First, HyperMesh constructs lines connecting the midpoints of each edge of the quad (dotted in the picture below).  Next, HyperMesh constructs a third line (green in the picture below) perpendicular to one of the initial lines, then finds the angle between this third line and the remaining initial line--with which is it most likely not perpendicular, unless the quad is a perfect rectangle.

α is the skew (angle) value.

Taper

First, the quad’s nodes are projected to plane defined by the orthonormal vectors U-V found as follows:

Z = X × Y

V = Z × X

U = X

In HyperMesh Taper angle is defined as: .

The optimal value is 0°, and a generally acceptable limit is. <= 30°. The The ultimate limit, which the Taper angle cannot exceed is 45°.

Warpage

This check applies only to quads or rectangular faces of solids.

Warpage = 100 * h / max { Li },

where h is the minimum distance between the diagonals.