Patent ID: 11951692
Assignee: MITSUBISHI CHEMICAL CORPORATION
Field: Measurement (Instruments)
Classification: CPC B  C  G  Y | IPC B  C  G

Claim 0:
1. A sheet-shaped fiber-reinforced resin material comprising dispersed carbon fiber bundles impregnated with a thermosetting resin and having a longitudinal direction and a width direction, wherein a diffracted X-ray at a diffraction angle 2θ of 25.4° is detected by an X-ray diffraction method, and a roughness β obtained by the following Formulas (1) to (3) is in a range of 0.5 to 4.5,, β
     =
     
      
       
        ∫
        0
        360
       
       
        
         
          ❘
          "\[LeftBracketingBar]"
         
         
          f
          (
          ϕ
          )
         
         
          ❘
          "\[RightBracketingBar]"
         
        
        ⁢
        d
        ⁢
         
        ϕ
        ×
        
         1
         360
        
       
      
      =
      
       
        (
        
         
          ∑
          
           i
           =
           2
          
          N
         
          
         
          
           (
           
            
             
              ❘
              "\[LeftBracketingBar]"
             
             
              f
              (
              
               ϕ
               i
              
              )
             
             
              ❘
              "\[RightBracketingBar]"
             
            
            +
            
             
              ❘
              "\[LeftBracketingBar]"
             
             
              f
              (
              
               ϕ
               
                i
                -
                1
               
              
              )
             
             
              ❘
              "\[RightBracketingBar]"
             
            
           
           )
          
          ×
          d
          ⁢
          ϕ
          ×
          
           1
           2
          
         
        
        )
       
       ×
       
        1
        360
       
      
     
    
   
   
    
     (
     1
     )
    
   
  
 

wherein:
f(ϕi) is a luminance obtained by subtracting an average luminance from a luminance (I(ϕi)) at an i-th rotation angle (ϕi) in X-ray diffraction measurement represented by the following Formula (2),
dϕ is a step width of the X-ray diffraction measurement, I(ϕi) is normalized so that an integration strength represented by the following Formula (3) becomes 10000:, f
      ⁡
      (
      
       ϕ
       i
      
      )
     
     =
     
      
       I
       ⁡
       (
       
        ϕ
        i
       
       )
      
      -
      
       
        
         
          ∑
           
         
         
          i
          =
          1
         
         N
        
        ⁢
        
         I
         ⁡
         (
         
          ϕ
          i
         
         )
        
       
       N
      
     
    
   
   
    
     (
     2
     )
    
   
  
 

 
  
   
    
     
      
       
        ∫
        0
        360
       
       
        
         I
         ⁡
         (
         ϕ
         )
        
        ⁢
        d
        ⁢
        ϕ
       
      
      =
      
       
        
         ∑
         
          i
          =
          2
         
         N
        
         
        
         
          (
          
           
            I
            ⁡
            (
            
             ϕ
             i
            
            )
           
           +
           
            I
            ⁡
            (
            
             ϕ
             
              i
              -
              1
             
            
            )
           
          
          )
         
         ×
         d
         ⁢
         ϕ
         ×
         
          1
          2
         
        
       
       =
       10000.
      
     
    
   
   
    
     
      (
      3
      )