Chapter 8 Fiber Properties and ldentification Yiping Qiu Donghua University
Chapter 8 Fiber Properties and Identification Yiping Qiu Donghua University
Fiber Properties and ldentification Mechanical properties Tensile properties Tensile deformation △
Fiber Properties and Identification • Mechanical properties – Tensile properties • Tensile deformation l 0 l f l
Fiber Properties and ldentification Tensile deformation: some concepts Elongation △Z Strain 1r-b0△l
Fiber Properties and Identification • Tensile deformation: some concepts – Elongation 0 l l l = f − – Strain 0 0 0 l l l l l f = − =
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/in
Fiber 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
Fiber Properties and ldentification Tensile deformation For textile yarns and fibers, hard to determine cross-section area use linear density gf/denier or N/tex
Fiber Properties and Identification • Tensile deformation – For textile yarns and fibers, hard to determine cross-section area use linear density: gf/denier or N/tex