关于 material orientation 和 material direction

ma

在abaqus 中 USDFLD子程序中， 以下两个数组  DIRECT(3,3) An array containing the direction cosines of the material directions in terms of the global basis directions. DIRECT(1,1), DIRECT(2,1), DIRECT(3,1) give the (1, 2, 3) components of the first material direction; DIRECT(1,2), DIRECT(2,2), DIRECT(3,2) give the second material direction, etc. For shell and membrane elements, the first two directions are in the plane of the element and the third direction is the normal. This information is not available for beam elements.



T(3,3)   An array containing the direction cosines of the material orientation components relative to the element basis directions. This is the orientation that defines the material directions (DIRECT) in terms of the element basis directions. For continuum elements T and DIRECT are identical. For shell and membrane elements T(1,1) , T(1,2) , T(2,1) , T(2,2) , T(3,3) , and all other components are zero, where is the counterclockwise rotation around the normal vector that defines the orientation. If no orientation is used, T is an identity matrix. Orientation is not available for beam elements.

在abaqus帮助文档中，反复出现 material orientation  和 material direction

请问这两个词 含义有什么区别？  如果没有区别，为什么不用一个词来表达呢？

ma

global basis directions.  是不是指的总体直角坐标系，  可以指总体柱坐标系  和 球坐标系吗？

556688

material orientation  和 material direction，第一个是材料坐标系吧，第二个是材料方向（比如复合材料铺层方向），定义了材料坐标系后，就可以根据定义材料方向相对坐标系角度了。个人理解。