Fluorescence spectroscopy applied to study cyclic creep behaviour and internal stresses of semi-crystalline high-density polyethylene

Abstract

Cyclic creep or ratcheting behaviour has been characterized on semi-crystalline high-density polyethylene (HDPE) at 293 K using in situ extrinsic fluorescence spectroscopy. Fluorescent probe inserted in polymer offers the opportunity to establish a relationship between fluorescence phenomena and mechanical behaviour and more specifically to internal stresses. The influence of mean stress (σm), and stress amplitude (σa), on ratcheting strain (εr) and strain amplitude (εa) was studied in term of internal stresses development. The physical base of internal stress state has been discussed.