Hourglass entities define hourglass and bulk viscosity properties which are referenced
    via HGID in the *PART command.
    LS-DYNA Cards
      
      
        
              
                | Card | 
                Description  | 
              
            
              
                | *HOURGLS | 
                Defines hourglass and bulk viscosity properties which are referenced via HGID
                  in the *PART command | 
              
            
 
       
    
    OptiStruct Cards
      
      Defines hourglass control parameters to reduce spurious zero-energy modes in elements with
        reduced integration.
              
                | Card | 
                Description  | 
              
            
              
                | HOURGLS | 
                Defines hourglass control parameters to reduce spurious zero-energy modes in
                  elements with reduced integration |