Crack propagation in a PVA dual-crosslink hydrogel: Crack tip fields measured using digital image correlation

被引：17

作者：

Liu, Mincong ^{[1
]}

Guo, Jingyi ^{[1
]}

Li, Zhilong ^{[1
]}

Hui, Chung-Yuen ^{[1
]}

Zehnder, Alan T. ^{[1
]}

机构：

[1] Cornell Univ, Sibley Sch Mech & Aerosp Engn, Field Theoret & Appl Mech, Ithaca, NY 14853 USA

来源：

MECHANICS OF MATERIALS | 2019年 / 138卷

基金：

美国国家科学基金会;

关键词：

Digital image correlation; Hydrogel; Crack tip field; Fracture; Crack growth; Viscoelastic; STRESS INTENSITY FACTOR; FATIGUE FRACTURE; STRAIN-MEASUREMENTS; TOUGH; 2D; REPLACEMENT; BEHAVIOR; GELS;

D O I：

10.1016/j.mechmat.2019.103158

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

As a non-contact, full field deformation measurement technique, 2D digital image correlation (DIC) is a good candidate for the measurement of the crack tip fields of gels. We apply 2D DIC to study the crack propagation of a Poly(vinyl) alcohol (PVA) hydrogel specimen immersed in mineral oil. Practical issues such as the quality of the speckle pattern and the possible optical distortion are discussed. The accuracy of the setup in measuring the high-gradient crack tip strain field is carefully validated. A hydrogel specimen with an existing crack is loaded to fracture and the strain field near the tip of the propagating crack is measured using DIC. We find that the crack propagates under steady state conditions. The moving crack induces high strain rates at material points ahead of the crack.

引用

页数：9

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