積層板の固有値解析について

- July 7, 2025 at 6:15 am
  
  hidechika.karasawa.74
  Subscriber
  
  積層板の固有値解析を実施したところ，添付画像1のようにある層のみ振動しているような結果となりました．
  本来であれば添付画像2のように板自体が振動します．（添付画像2は金属の単層板です）
  積層板の固有値解析を添付画像2のように実行したい場合，注意すべき事項などはありますでしょうか．
  恐らく層間の接触定義に問題があるのではないかと考えておりますが，原因を特定できておりません．
  ちなみに，積層板の層間接触定義には*CONTACT_AUTOMATIC_ONE_WAY_SURFACE_TO_SURFACE_TIEBREAK (OPTION=7)を用いております．
  ご教示頂けますと幸いです．何卒よろしくお願いいたします．
- July 7, 2025 at 4:33 pm
  
  igandiko
  Ansys Employee
  
  Hello, In modal analysis, all contacts are treated as tied contact, as long as surface A nodes and surface B segments are as close to each other as possible. In your model, maybe the tied contact is not behaving correctly and nodes are not being tied correctly. Please check for warnings in mes00* files for the nodes that are not being tied.
  *contact_single_surface_tied has a paramter ("CLOSE") to control tying distance directly.
  - July 10, 2025 at 6:15 am
    
    hidechika.karasawa.74
    Subscriber
    
    Thank you for your reply.
    After sharing the nodes, the situation improved from the previous analysis.
    However, depending on the mode, hourglass (?) occurred on the elements as shown in the attached image.
    What settings would be necessary to improve the situation?