Fiber Properties and ldentification Stress-strain curves Work of rupture Area under load- displacement curve Specific work of Specific Work rupture of rupture Area under stress 8 strain curve
Fiber Properties and Identification • Stress-strain curves – Work of rupture • Area under loaddisplacement curve. – Specific work of rupture • Area under stressstrain curve 0 Specific Work of Rupture
Fiber Properties and ldentification Elastic recovery percent of strain being recovered when load is released Occurs at the initial part of the stress-strain curve where deformation is small and almost no relative movement of molecules Energy absorbed can be recovered completely Elastic recovery as cross-link V as h-bond and ionic bond V as strain or stress
Fiber Properties and Identification • Elastic recovery percent of strain being recovered when load is released. • Occurs at the initial part of the stress-strain curve where deformation is small and almost no relative movement of molecules. • Energy absorbed can be recovered completely. • Elastic recovery as cross-link • as H-bond and ionic bond • as strain or stress
Fiber Properties and ldentification Resilience(Work of recovery) The ratio of energy recovered to energy absorbed May be extensional, flexural, compressional or torsional Is a function of deformation as crimp and cross-link V as h-bond and ionic bond Vas strain Resilience→> wrinkle↓ e.g. PET VS Cotton and Rayon
Fiber Properties and Identification • Resilience (Work of recovery) The ratio of energy recovered to energy absorbed • May be extensional, flexural, compressional or torsional. • Is a function of deformation. as crimp and cross-link as H-bond and ionic bond as strain • Resilience → wrinkle – e.g. PET vs Cotton and Rayon