An indentation method to determine the constitutive parameters of hyperelastic films under large deformation: Theoretical model, experiments and simulations

IF 3.4 3区工程技术 Q1 MECHANICS

International Journal of Solids and Structures Pub Date : 2024-08-08 DOI:10.1016/j.ijsolstr.2024.113007

Haoyuan Che , Martine Ben Amar , Wei Zhu , Shengjun Fan , Jinsong Leng , Fei Jia , Yanju Liu

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引用次数: 0

Abstract

The characterization of the mechanical properties of soft films is of great importance for their applications. In our previous research, we demonstrate the existence of a maximum load occurring during the indentation process of a perforated film by a spherical indenter. Based on this result, an approach to obtain the shear modulus of the film material using the method of finite element analysis has been proposed. However, our previous work does not consider the effect of friction between the film and the indenter, which has a significant influence on the value of the maximum load. Here, a theoretical model is presented which takes into account the role of friction. The reliability and accuracy of the theoretical model are validated by comparison with simulations and experimental results. In addition, the indenter eccentricity and round hole shape deviations which commonly occur in actual indentation tests, are investigated by combining indentation test measurements with finite element analysis. The performance of this method on porous films is also analyzed experimentally and numerically. The results reveal that this indentation method is still effective for porous films. This work provides a fundamental understanding of the mechanism of the indentation method and is expected to provide a new perspective for local characterization of films, even with multiple holes.

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确定大变形条件下超弹性薄膜构成参数的压痕法：理论模型、实验和模拟

软薄膜机械性能的表征对其应用具有重要意义。在之前的研究中，我们证明了在球形压头压入穿孔薄膜的过程中存在最大载荷。基于这一结果，我们提出了一种利用有限元分析方法获得薄膜材料剪切模量的方法。然而，我们之前的工作并没有考虑薄膜与压头之间的摩擦力影响，而摩擦力对最大载荷值有重大影响。在此，我们提出了一个考虑到摩擦作用的理论模型。通过与模拟和实验结果的对比，验证了理论模型的可靠性和准确性。此外，通过将压痕测试测量与有限元分析相结合，研究了实际压痕测试中经常出现的压头偏心和圆孔形状偏差。此外，还对该方法在多孔薄膜上的性能进行了实验和数值分析。结果表明，这种压痕方法对多孔薄膜仍然有效。这项工作从根本上理解了压痕法的机理，有望为薄膜的局部表征（即使有多个孔）提供一个新的视角。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Solids and Structures 物理-力学

CiteScore

6.70

自引率

8.30%

发文量

405

审稿时长

70 days

期刊介绍： The International Journal of Solids and Structures has as its objective the publication and dissemination of original research in Mechanics of Solids and Structures as a field of Applied Science and Engineering. It fosters thus the exchange of ideas among workers in different parts of the world and also among workers who emphasize different aspects of the foundations and applications of the field. Standing as it does at the cross-roads of Materials Science, Life Sciences, Mathematics, Physics and Engineering Design, the Mechanics of Solids and Structures is experiencing considerable growth as a result of recent technological advances. The Journal, by providing an international medium of communication, is encouraging this growth and is encompassing all aspects of the field from the more classical problems of structural analysis to mechanics of solids continually interacting with other media and including fracture, flow, wave propagation, heat transfer, thermal effects in solids, optimum design methods, model analysis, structural topology and numerical techniques. Interest extends to both inorganic and organic solids and structures.