Mines Saint-Etienne, Univ Lyon, Univ Jean Monnet, INSERM, U 1059 Sainbiose, Centre CIS, F - 42023, Saint-Etienne, France.
New Technologies - Research Centre, University of West Bohemia, Univerzitní 8, 301 00, Plzeň, Czech Republic.
J Mech Behav Biomed Mater. 2021 Feb;114:104210. doi: 10.1016/j.jmbbm.2020.104210. Epub 2020 Dec 4.
Textile-based implant (mesh) treatment is considered as a standard of care for abdominal wall hernia repair. Computational models and simulations have appeared as one of the most promising approach to investigate biomechanics related to hernia repair and to improve clinical outcomes. This paper presents a novel anisotropic hypo-elastoplastic constitutive model specifically established for surgical knitted textile implants. The major mechanical characteristics of these materials such as anisotropy and permanent set have been reproduced. For the first time ever, we report an extensive mechanical characterization of one of these meshes, including cyclic uniaxial tension, planar equibiaxial tension and plunger type testing. These tests highlight the complex mechanical behavior with strong nonlinearity, anisotropy and permanent set. The novel anisotropic hypo-elasto-plastic constitutive model has been identified based on the tensile experiments and validated successfully against the data of the plunger experiment. In the future, implementation of this characterization and modeling approach to additional surgical knitted textiles should be the direction to follow in order to develop clinical decision support software for abdominal wall repair.
基于纺织物的植入物（网片）治疗被认为是腹壁疝修补的标准治疗方法。计算模型和模拟已成为研究与疝修补相关的生物力学并改善临床结果的最有前途的方法之一。本文提出了一种专门为外科针织纺织植入物建立的新型各向异性次弹性塑性本构模型。重现了这些材料的主要力学特性，如各向异性和永久变形。我们首次对其中一种网片进行了广泛的力学特性研究，包括循环单轴拉伸、平面双向等轴拉伸和柱塞式测试。这些测试突出了具有强非线性、各向异性和永久变形的复杂力学行为。基于拉伸实验，确定了新型各向异性次弹性塑性本构模型，并成功地验证了柱塞实验数据。未来，应朝着对其他外科针织纺织品进行这种特性和建模方法的实施方向发展，以便为腹壁修复开发临床决策支持软件。
