期刊
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
卷 46, 期 4, 页码 1627-1637出版社
WILEY
DOI: 10.1111/ffe.13951
关键词
biomaterials; blunting line; crack tip displacement; hyperelastic material
This article discusses the phenomenon of large deformations that precede fracture in compliant materials, which reshapes initially sharp cracks into rounded defects. This elastic crack blunting is unique to rubber-like polymers and soft biological tissues like skin, vessel walls, and tendons. The characteristic features of the crack-tip zone and the strain-hardening behavior of soft biological tissues are analyzed through finite element analyses and experimental tests on silicone samples. A simplified geometrically nonlinear model is proposed and validated to describe the progressive blunting at the crack tip and its effect on flaw tolerance, providing a criterion for the fracture condition in nonlinear soft materials.
Fracture of compliant materials is preceded by large deformations that reshape initially sharp cracks into rounded defects. This phenomenon, known as elastic crack blunting, is peculiar of rubber-like polymers and soft biological tissues, such as skin, vessel walls, and tendons. With this work, we aim to provide a discussion on crack-tip blunting and its implications in terms of tearing resistance and flaw tolerance of soft elastic materials. The characteristic features of the crack-tip zone in the framework of nonlinear elasticity are reviewed analytically and with the help of finite element analyses on pure shear cracked geometries. Specifically, the strain-hardening behavior typical of soft biological tissues is addressed, and we illustrate its effect on crack-tip blunting, in terms of a local radius of curvature at the crack tip. A simplified geometrically nonlinear model, proposed to describe the progressive blunting at the crack tip and its effect on flaw tolerance, is validated through finite element analyses and experimental tests on silicone samples. We show how this can lead to a simplified criterion to define the fracture condition in nonlinear soft materials.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据