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

Claim 4:
5. The method for characterizing the propagation of the metallic short cracks and long cracks according to claim 4, further comprising:
in the process of acquiring crack tip opening displacement caused by monotonic tensile, acquiring the crack tip opening displacement caused by the monotonic tensile based on a fracture mechanics theory and according to the material critical fracture stress and the crack tip opening displacement amount, wherein an expression of the crack tip opening displacement caused by monotonic tensile is:, φ
   mt
  
  =
  
   
    K
    max
    2
   
   
    π
    ⁢
    E
    ⁢
    
     σ
     f
    
    ⁢
    
     ε
     f
    
   
  
 

wherein σmt represents the crack tip opening displacement caused by the monotonic tensile, and Kmax represents the maximum far-field stress.