Ansys常见疑问解答汇总

PRXY 和 NUXY 区别

ansys解释

主泊松比PRXY，次泊松比NUXY之间的关系。

   ansys帮助中原文写到

(GXY) defaults to EX/2(1+NUXY))

且描述了：所有的输入，无论是主泊松比(PRXY，PRYZ，PRZX)还是泊松比(NUXY，NUYZ，NUZX)，都会转化为次泊松比，然后进行计算。

弹性力学解释

二维

弹性力学中的二维情况：
G = E 1 + ν G=\frac{E}{1+\nu} G=1+νE​

• E E E—杨氏弹性模量
• ν \nu ν—泊松比
• G G G—剪切模量

三维

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section 和 real constant 都定义时的覆盖问题

• 百度知道描述了shell181的情况，结论是实常数会被覆盖。
• Ansys说明中对BEAM188的描述:

BEAM188 ignores any real constant data. See the SECCONTROL command for defining the transverse-shear stiffness and added mass. A summary of the element input is given in “BEAM188 Input Summary”.

• XANSYS论坛的讨论

Brock Wilt 这里表述了优先采用实常数，忽略截面定义Beam Sections and Real Constants.

However, once I use both section and real constants it uses the real constant thickness and does not take into account the thin-walled square.

Germano.Freitas提到了帮助文档

Please have a look at the manual: ANSYS 7.1 documentation > Structural Analysis guide > Beam Analysis > 15.1

其中表述的help文档位置，在ansys 15的位置为：ANSYS Documentation->Mechanical APDL->Structural Analysis Guide->Beam Analysis and Cross Sections这附近。

Ansys公司Sheldon回复到：

If you need to capture section stresses more accurately, BEAM188/189 have section integration points which capture the variations better than BEAM4 or BEAM44, which use simple F/A or Mc/I calculations. This information is documented in the ANSYS Theory Manual, Ch. 14, so please refer to that section for details on element formulation and assumptions - doing so may help to get a better understanding of how values are calculated and what assumptions are related to each element instead of assuming that all elements behave in a similar manner.

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