Forming Limit Curve (FLC)

The stress-strain curve of a material illustrates its mechanical properties and gives the forming limit beyond which it fails. Inspire Form supports several methods for calculating the stress-strain curve.

Keeler – Beizer (Original)

Inputs : Sheet thickness (t), Strain hardening (n).

Keeler – Beizer (Modified I)

Inputs : Sheet thickness (t), Strain hardening (n).

Keeler – Beizer (Modified II)

Inputs : Sheet thickness (t), Strain hardening (n).

NADDRG

Inputs : Sheet thickness (t), Strain hardening (n).

Abspoel & Scholting

Inputs : Sheet thickness (t), Strain hardening (n), Total elongation in 0 degree (A₈₀), Min Total elongation among all directions and Average Anisotropy (r).

Method : Calculate four points to create the FLC.

Point 1: TE

No thickness dependency for the validity of the equation.

Point 2: PS

No thickness dependency for the validity of the equation.

Point 3: IM

• If thickness (t) is less than or equal to

  
  
  

• If thickness is greather than

  
  
  

Point 4: BI

• If thickness (t) is less than or equal to

  
  
  

• If thickness is greather than