Fiber Properties and ldentification Tensile deformation Load Force applied to extend the fiber Unfair to compare force applied to fibers with different sizes Stress Unit: Pa =N/m2 Engineering stress F O or dyne/cm psi pound/inFiber Properties and Identification • Tensile deformation – Load: • Force applied to extend the fiber • Unfair to compare force applied to fibers with different sizes. – Stress –Engineering stress A F σ = Unit: Pa = N/m2 or dyne/cm2 psi = pound/in2