Identification of the viscoelastic properties of soft materials using a convenient dynamic indentation system and procedure

粘弹性 材料科学 剪切模量 缩进 动态模量 振荡(细胞信号) 流离失所(心理学) 机械 半径 球体 材料性能 变形(气象学) 动态力学分析 复合材料 物理 计算机科学 聚合物 化学 心理学 生物化学 计算机安全 天文 心理治疗师
作者
Hasan Körük,Salih Berk Yurdaer,Hayati Omer Koc,Ayca Besli
出处
期刊:Materials Today: Proceedings [Elsevier]
卷期号:57: 464-468 被引量:5
标识
DOI:10.1016/j.matpr.2022.01.188
摘要

The responses of soft structures such as tissue depend on their viscoelastic properties. Therefore, the knowledge of the elastic and damping properties of soft materials is of great interest. This paper presents the identification of the viscoelastic properties of soft materials using a convenient dynamic indentation system and procedure. Using an electromagnet, a force is applied to a rigid sphere located at the soft-material interface and the dynamic response of the sphere is recorded using a high-speed camera. The recorded video is processed to identify the displacement of the sphere as a function of time. The dynamic response of the sphere located at the soft-material interface is predicted using an analytical model that considers the shear modulus and density of the soft sample, the radiation damping due to shear waves, and the radius and density of the sphere. By matching the measured and predicted steady-state displacements of the sphere, the shear modulus of the soft sample is determined. The viscous damping ratio of the soft sample is identified by using an equivalent viscous damping ratio for the soft sample in the analytical model and matching the measured and predicted oscillation amplitudes of the sphere. Experiments and analyzes are performed using gelation phantoms with different mechanical properties, spheres of different materials and sizes, and different force levels to verify the system and procedure. Three experiments are performed for each gelation phantom, sphere, and external force, and the repeatability of the results is presented. The results show that the dynamic indentation system and procedure presented in this study can be conveniently used to determine the viscoelastic properties of soft materials in practical applications.
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