Critical Fiber Length for Pullout Resistance Calculator Leave a Comment / By GULSHAN SHAFI / February 28, 2024 Critical Fiber Length is a Prevents fiber pullout from matrix interface. The formula is given by: Where: Lcritical​ is the critical fiber length. τinterfacial​ is the interfacial shear strength between the fiber and matrix. τfiber​ is the shear strength of the fiber. Related