Patent ID: 11958137
Assignee: THE REGENTS OF THE UNIVERSITY OF MICHIGAN
Field: Computer technology (Electrical engineering)
Classification: CPC B  G | IPC B  G

Claim 7:
8. The method of claim 1 wherein a fatigue damage parameter is defined in term of structural strain range as, Δ
   ⁢
   
    E
    s
   
  
  =
  
   
    Δε
    NP
   
   
    
     t
     
      
       2
       -
       m
      
      
       2
       ⁢
       m
      
     
    
    ⁢
    
     
      I
      ⁡
      (
      
       r
       ′
      
      )
     
     
      1
      m
     
    
   
  
 

where ΔεNP is the structural strain range incorporating load-path non-proportionality factor, t is material thickness, m is an exponent derived crack growth data, r′ is a bending ratio, and l(r′) is a dimensionless polynomial function of the bending ratio.