各向异性的晶体材料弹性怎么模拟？

xtayssy970512

我是初学者,遇到了一个问题:晶体是各向异性的,那定义材料特性时.要输入什么参数,才算完整了??
就是遇到各向异性的,需要注意那些地方?
谢谢了!!
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[ 本帖最后由 sysh320 于 2006-11-24 18:08 编辑 ]

xiven2008

这个见帮助里有，如下：

2.5.1.7. Anisotropic
This option (ANISO) allows for different stress-strain behavior in the material x, y, and z directions as well as different behavior in tension and compression (see Anisotropic Elastic Materials). A modified von Mises yield criterion is used to determine yielding. The theory is an extension of Hill's formulation as noted in the ANSYS, Inc. Theory Reference. This option is not recommended for cyclic or highly nonproportional load histories since work hardening is assumed. The principal axes of anisotropy coincide with the material (or element) coordinate system and are assumed not to change over the load history.

The material behavior is described by the uniaxial tensile and compressive stress-strain curves in three orthogonal directions and the shear stress-engineering shear strain curves in the corresponding directions. A bilinear response in each direction is assumed. The initial slope of the curve is taken as the elastic moduli of the material. At the specified yield stress, the curve continues along the second slope defined by the tangent modulus (having the same units as the elastic modulus). The tangent modulus cannot be less than zero or greater than the elastic modulus. Temperature dependent curves cannot be input. All values must be input as no defaults are defined. Input the magnitude of the yield stresses (without signs). No yield stress can have a zero value. The tensile x-direction is used as the reference curve for output quantities SEPL and EPEQ.

Initialize the stress-strain table with TB,ANISO. You can define up to 18 constants with TBDATA commands. The constants (C1-C18) entered on TBDATA commands (6 per command) are:

Constant Meaning (all units are Force/Area)
C1-C3 Tensile yield stresses in the material x, y, and z directions
C4-C6 Corresponding tangent moduli
C7-C9 Compressive yield stresses in the material x, y, and z directions
C10-C12 Corresponding tangent moduli
C13-C15 Shear yield stresses in the material xy, yz, and xz directions
C16-C18 Corresponding tangent moduli

See the TB command for a listing of the elements that can be used with this material option.

See Plastic Material Options in the ANSYS Structural Analysis Guide for more information on this material option.

xtayssy970512

谢谢了!!!
那你有晶体的这些参数吗?
急急急!!!!!!!!!!!
先谢了!!!