Puncturing of soft tissues: experimental and fracture mechanics-based study

被引:6
|
作者
Montanari, Matteo [1 ]
Brighenti, Roberto [1 ]
Terzano, Michele [2 ]
Spagnoli, Andrea [1 ]
机构
[1] Univ Parma, Dept Engn & Architecture, Parco Area Sci 181 A, I-43124 Parma, Italy
[2] Graz Univ Technol, Inst Biomech, Stremayrgasse 16 2, A-8010 Graz, Austria
基金
欧盟地平线“2020”;
关键词
INTERACTION FORCES; NEEDLE INSERTION; DEEP PENETRATION; RESISTANCE; TOUGHNESS; HYDROGELS; STRENGTH; SOLIDS; SPEED;
D O I
10.1039/d3sm00011g
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The integrity of soft materials against puncturing is of great relevance for their performance because of the high sensitivity to local rupture caused by rigid sharp objects. In this work, the mechanics of puncturing is studied with respect to a sharp-tipped rigid needle with a circular cross section, penetrating a soft target solid. The failure mode associated with puncturing is identified as a mode-I crack propagation, which is analytically described by a two-dimensional model of the target solid, taking place in a plane normal to the penetration axis. It is shown that the force required for the onset of needle penetration is dependent on two energy contributions, that are, the strain energy stored in the target solid and the energy consumed in crack propagation. More specifically, the force is found to be dependent on the fracture toughness of the material, its stiffness and the sharpness of the penetrating tool. The reference case within the framework of small strain elasticity is first investigated, leading to closed-form toughness parameters related to classical linear elastic fracture mechanics. Then, nonlinear finite element analyses for an Ogden hyperelastic material are presented. Supporting the proposed theoretical framework, a series of puncturing experiments on two commercial silicones is presented. The combined experimental-theoretical findings suggest a simple, yet reliable tool to easily handle and assess safety against puncturing of soft materials.
引用
收藏
页码:3629 / 3639
页数:11
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