Question

abaqus可以实现在不同的step中改变材料的密度吗

Answer 1

可以。比较麻烦。

请问，需要改变密度的那个Part instance是基于什么Field变量来改变密度呢？或者就是你就是想改？

不管哪一种情况，你都可以得到一个场变量。如果没有也就是说你纯粹就是想改变它，那你可以设置一个空的场变量，a dummy field variable，让这个常变量受Step的控制，在不同的Step里面就可以分级来控制最后的Density的大小和变化。这一切都需要使用Fortran subroutine子程序编程。使得密度在子程序之中被重新定义和操控。

场变量的数目可以任意。见如下的关键词手册。写得很清楚。

你需要有相当的子程序编写技能。

*DENSITY
Specify material mass density.

This
option is used to define a material's mass density. In an
Abaqus/Standard analysis spatially varying mass density can be defined
for solid continuum elements using a distribution (“Distribution definition,” Section 2.8.1 of the Abaqus Analysis User's Guide).
Products: Abaqus/Standard Abaqus/Explicit Abaqus/CFD Abaqus/CAE
Type: Model data
Level: Model
Abaqus/CAE: Property module
Reference:
“Density,” Section 21.2.1 of the Abaqus Analysis User's Guide

Optional parameters:
DEPENDENCIES
Set
this parameter equal to the number of field variables included in the
definition of the density, in addition to temperature. If this parameter
is omitted, it is assumed that the density is constant or depends only
on temperature. See “Specifying field variable dependence” in “Material data definition,” Section 21.1.2 of the Abaqus Analysis User's Guide, for more information.
This parameter is not relevant in an Abaqus/Standard analysis if spatially varying density is defined using a distribution. See “Distribution definition,” Section 2.8.1 of the Abaqus Analysis User's Guide.
It is assumed that the density is constant in Abaqus/CFD analyses.
PORE FLUID
This parameter applies only to Abaqus/Standard analyses.
Include this parameter if the density of the pore fluid in a porous medium is being defined.