hypermesh单元质量参数说明

个内角变为负值

(

反转

)

或者大于

180

度。

（此段摘自网贴）

of Jacobian evaluation at the Gauss points, values

of 0.7 and above are generally acceptable. You

can select which method of evaluation to use

(Gauss point or corner node) from the Check

Element Settings window.

Minimum element lengths are calculated using

one of two methods:

?

?

non-tetrahedral 3-D elements.

The shortest edge of the element.

This method is

The shortest distance from a corner node to its opp

Length(min)

最小长

度

—

最小长度，计算使用以下两种方式：

（

1

）单元最短变长，对于非四面体

网 格；

（

2

） 从节点到对角边（或面）的最

短距离。

the case of tetra elements); referred to as

You can choose which method to use in the Check

Element Settings window.

Note that this setting

also affects the calculation of Aspect Ratio.

HyperMesh uses 2 methods to calculate the

Minimum

Length /

Size

最小单

元长度

—

使用两种方法计算最小单元长度：

（

1

）最短边长；

（

2

）节点到对边的

高度。

minimum element size: the

shortest edge

(in

which the length of the shortest edge of each

element is used) and the

height to closest

node

(which is more accurate, but more complex).

Height to Closest Node (HCN)

is calculated

differently for different element types.

For triangular elements:

For each corner node (i) HyperMesh calculates

the closest (perpendicular) distance to the ray

including the opposite leg of the triangle, h(i). HCN

=

min(hi) * 2/sqrt(3.0)

. The scaling factor

2/sqrt(3.0)

ensures that for equilateral

triangles, the HCN is the length of the minimum

side.

For quadrilateral elements:

For each corner node, HM calculates the closest

(perpendicular) distances to the rays containing

the legs of the quadrilateral that do not include this

node. The figure above depicts these lengths as

red lines. Height to Closest Node is taken to be the

minimum of all eight lines and the four edge

lengths (thus, the minimum of 12 possible

lengths).

Skew of triangular elements is calculated by

skew

面扭曲

三 角单元的扭曲度计算方式如下：

从

finding the minimum angle between the vector

每个节点到对边中点的矢量以及两

from each node to the opposing mid-side, and the

相邻边中点矢量的最小夹角

vector between the two adjacent mid- sides at each

node of the element.