Damage evolution in high density polyethylene under tensile, compressive, creep and fatigue loading conditions. (15th June 2019)

• Record Type: Journal Article
• Authors: Zhang, Yi; Ben Jar, P.-Y.; Xue, Shifeng; Li, Lin; Han, Limei
• Is Part Of: Engineering fracture mechanics. Volume 215(2019)
• Page Start: 112
• Page End: 116
• Publication Date: 2019-06-15
• Subjects: Damage evolution -- HDPE -- Creep -- Fatigue; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2019.05.008
• Languages: English
• ISSNs: 0013-7944

Abstract

Highlights: Influence of tensile, compressive, creep and fatigue loading histories on mechanical properties of PE is examined. Damage evolution laws under three loading conditions are experimentally determined. A unified, plastic strain-controlled damage law is established for PE. Abstract: Influence of various loading histories on mechanical properties and damage evolution of polyethylene (PE) is quantified through a two-stage test method. The first-stage tests are to introduce damage by subjecting the specimens to different prestrain levels under tensile, compressive, creep and fatigue loading condition. Two months later, the second-stage tests apply monotonic tensile loading at a crosshead speed of 0.01 mm/min to characterize the mechanical properties for specimens that have had damage generated in the first-stage tests. Experimental results suggest that yield stress and loading stiffness decrease and residual plastic strain increases with the increase of prestrain introduced in the first-stage tests. Damage evolution law, based on the degradation of loading stiffness has been established as a function of prestrain and residual plastic strain. Results show that damage variable expressed as a function of prestrain strongly depends on loading conditions applied in the first-stage tests. However, damage evolution described by the relationship between damage variable and plastic strain is found to be independent on the loading condition, suggesting that a unified, plastic strain controlled damage evolution law can be established for PE materials.