Dynamic effect in the fatigue fracture of viscoelastic solids. (July 2022)

• Record Type: Journal Article
• Authors: Guo, Qiang; Caillard, Julien; Colombo, Davide; Long, Rong
• Is Part Of: Extreme mechanics letters. Volume 54(2022)
• Publication Date: 2022-07
• Subjects: Fatigue -- Viscoelasticity -- Fracture criterion -- Dissipation -- Crack growth velocity -- Spatial hysteresis; Mechanics -- Periodicals; Mechanics, Applied -- Periodicals; Mechanics; Electronic journals; Periodicals; 531.05
• DOI: 10.1016/j.eml.2022.101726
• Languages: English
• ISSNs: 2352-4316

Abstract

Abstract: Crack growth in viscoelastic solids under cyclic loading tends to be faster than that under static loading with the same amplitude. This phenomenon, known as "dynamic effect", is a key mechanism underlying the fatigue fracture of soft viscoelastic polymers, but its physical nature remains a mystery. We develop a scaling theory to delineate how viscoelastic dissipation associated with crack growth is governed by the coupling between three time-dependent processes: cyclic loading, crack growth and viscoelastic creep. In the limit of slow crack growth and slow cyclic loading, a simple integral equation is derived to predict the crack growth velocity under different cyclic loading frequencies.