abq在作静力分析时，可以用单元生死么？

jacobi

abq在作静力分析时，可以用单元生死么？
具体是哪条keyword？
谢谢了。^_^

jinlin

呵呵，可以，参看document

jacobi

谢谢先，
描述一下要求：比如，计算时，某个单元的应力/应变...或其它量值超过一定的标准，就退出模型。
在help里面只看到model change，
但是，它只能在下一个step前Remove or reactivate elements，
没法在step计算中Remove or reactivate elements。

shock111

*SECTION CONTROLS, ELEMENT DELETION

jeckaer

可以用*shear failure , node erotion=yes和*plastic联合起来

jacobi

jeckaer wrote:
可以用*shear failure , node erotion=yes和*plastic联合起来

很奇怪啊，
我的doc里面没有node erotion=yes这个选项！:O)
Optional parameters只有以下方面的介绍。
如下：

Optional parameters:
DEPENDENCIES
This parameter is relevant only for TYPE=TABULAR.

Set this parameter equal to the number of field variable dependencies included in the definition of the equivalent plastic strain at failure, in addition to temperature. If this parameter is omitted, it is assumed that the strain at failure depends on the plastic strain, the plastic strain rate, the dimensionless pressure-deviatoric stress ratio and, possibly, on temperature. See “Using the DEPENDENCIES parameter to define field variable dependence” in “Material data definition,” Section 9.1.2 of the ABAQUS Analysis User's Manual, for more information.

ELEMENT DELETION
Set ELEMENT DELETION=YES (default) to allow element deletion when the failure criterion is met.

Set ELEMENT DELETION=NO to allow the element to take hydrostatic compressive stress only when the failure criterion is met.

TYPE
Set TYPE=JOHNSON COOK to define the Johnson-Cook shear failure criterion. It requires the use of the *PLASTIC, HARDENING=JOHNSON COOK option.

Set TYPE=TABULAR (default) to define the failure strain in tabular data form. It requires the use of the *PLASTIC, HARDENING=ISOTROPIC option.

ps：我用的是6.5的。谢谢，
而且，里面的*SHEAR FAILURE只能用于explicit分析。

如下：
*SHEAR FAILURE
Specify a shear failure model and criterion.

This option is used with the Mises or the Johnson-Cook plasticity models to specify shear failure of the material. It must be used in conjunction with the option *PLASTIC, HARDENING=ISOTROPIC or JOHNSON COOK.

Product: ABAQUS/Explicit  

Type: Model data

Level: Model

shock111

*shear failure一般只适用延性金属材料

jacobi

shock111 wrote:
*shear failure一般只适用延性金属材料

谢谢shock111老兄，
俺现在想分析将一个铜块用车刀慢慢切断，
求出作用于车刀上力的大小，
由于没学过断裂力学，所以不太懂:I，
另外，我粗略看了一下*SECTION CONTROLS, ELEMENT DELETION
感觉，里面的参数更多，
并且，它只有于explicit分析和standard中的cohesive element，
ELEMENT DELETION
This parameter applies to ABAQUS/Explicit analyses and only to cohesive elements in ABAQUS/Standard analyses.

再次感谢指点。

jacobi

等待能者出来指点，^_^
谢谢