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". Refer to The K-Factor for further information.
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,