The following figure illustrates the dependency of the bend length on the neutral phase or neutral fiber of the sheet. Note that the length of the bend area remains the same along the neutral fiber or neutral phase.
The following definitions apply:
• Ro = ri + T
• Rn = ri + k*T
• Rn = L/phi Ri = L/phi - k*T
where:
• L is the length of the bend area along the neutral phase,
