Patent ID: 11907624
Assignee: TIANJIN UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 2:
3. The method for characterizing the propagation of the metallic short cracks and long cracks according to claim 2, further comprising:
in the process of acquiring crack tip opening displacement amount, acquiring the crack tip opening displacement amount according to a Zheng-Hirt crack tip blunting model, wherein an expression of acquiring the crack tip opening displacement amount is:, da
   /
   dN
  
  =
  
   x
   =
   
    
     K
     I
     2
    
    
     π
     ⁢
     
      σ
      
       yy
       2
      
     
    
   
  
 

in the expression, is a stress intensity factor of I-shaped cracks, and σyy represents an opening stress, which is equal to a material critical fracture stress, and x represents the crack tip opening displacement amount.