切削仿真常见问题及其解决 2014 年10 月17 日 14:03 【关于截面定义】 1.进行二维切削仿真时，定义的截面属性要勾选平面应变应力厚度，而且 一定要将默认值1 改为实际要仿的切削深度（对于车削，为径向车削深度） 尤其是以米为单位时。 1.网格过度变形（mesh distorted exessively）：可能原因有：切屑分离临界值定义过高；材料参数数量级错误；如果定义了 ALE 可以减小 remeshing frequency 的值从而提高网格重划分频率。 ERROR: There are a total of 7 excessively distorted elements The following checklist may be helpful in diagnosing the error: 1. Check contact definitions for problems such as excessive initial overclosure or unrealistic tied definition between contact pairs. A vector plot of velocities or accelerations will usually help to identify contact problems. 2. Check stiffness (elastic modulus) and mass (density) definitions for consistent units and verify that the combination is reasonable. 3. Check for poor mesh definition. 4. Check the boundary conditions for an excessive loading rate. The *DIAGNOSTICS, DEFORMATION SPEED CHECK=DETAIL option may be used to obtain detailed diagnostics information. 5. Check the current status of the structure to see if it has totally failed. 6. A dashpot or a very stiff spring may cause the analysis to go unstable. The *DYNAMIC, DIRECT option may be used to control the time increment directly. 2.发现有网格剧烈变形呈突刺状：碰到过的原因有两种：1）field output 中没有勾选state 里面的STATUS 变量，突刺状网格实际上是已经破坏掉的网格，勾选status 变量可以使已破坏的网格不显示。2）定义刀具与工件的face to face contact 时，刀具前后刀面作为主接触面方向定义反了。 3.刀具穿透网格：接触定义有问题，刀具与切削区的接触定义不正确或没有定义。一般来说,采用面点接触或面面接触较好. 4.切削区变形很大仍然无法分离：切屑分离临界值定义过高，或其它 材料参数设 置 有问题。 5.当 切削仿真时出 现左 图 无法分域 ...
