mass單元是不需要設置材料。

ansys手冊中有明確的描述

節(jié)點數(shù)：1

自由度：

UX, UY, UZ, VX, VY, VZ, AX, AY, AZ

Note:  For explicit dynamic analyses, V(X, Y, Z) refers to nodal velocity, and A(X, Y, Z) refers to nodal acceleration. Although V(X, Y, Z) and A(X, Y, Z) appear as DOFs, they are not actually physical DOFs. However, these quantities are computed as DOF solutions and stored for postprocessing.

Real Constants

If KEYOPT(1) = 0:

只需輸入質量

If KEYOPT(1) = 1:

輸入轉動慣量

IXX - Moment of inertia (must be > 0),

IXY - Moment of inertia,

IXZ - Moment of inertia,

IYY - Moment of inertia (must be > 0),

IYZ - Moment of inertia,

IZZ - Moment of inertia (must be > 0)

材料屬性

None, but you must define realistic dummy material properties to make this element behave correctly. The dummy properties will not be used in any solution.

Surface Loads

None

Body Loads

None

Special Features

All nonlinear features allowed for an explicit dynamic analysis.

KEYOPT(1)

Rotary inertia option:

0 -- 

3-D mass without rotary inertia (default)

1 -- 

3-D rotary inertia (no mass)