Viscosity Transient Phenomenon in Drop Impact Testing of Soft Material
Viscosity Transient Phenomenon in Drop Impact Testing of Soft Material作者机构：Department of Transportation and Environmental Engineering Graduate School of Engineering Hiroshima University Higashi-Hiroshima Japan
出 版 物：《World Journal of Mechanics》 (力学国际期刊（英文）)
年 卷 期：2016年第6卷第5期
页 面：181-191页
学科分类：08[工学] 0812[工学-计算机科学与技术（可授工学、理学学位）]
主 题：Strain Rate Dependence Soft Material Impact Force Thorn-Shape Waveform Viscosity Transient Standard Linear Solid (SLS) Model Flat Frontal Impact
摘 要：The authors carried out drop impact tests for several soft materials under a flat frontal impact condition in which a drop hammer with a flat bottom surface strikes a plate-like soft material in the normal direction. The experimental results indicated that the impact force waveforms of soft materials consisted of a thorn-shaped waveform and a subsequent mountain-shaped waveform. The thorn-shaped waveform was strongly affected by the strain rate. In the present study, the occurrence mechanism of this distinctive waveform was discussed from the viewpoint of the viscosity transient phenomenon. A standard linear solid (SLS) model in which the viscosity transient phenomenon was considered was applied to the simulation. Some features of the impact force waveform of soft materials could be explained by the SLS model. Furthermore, the thorn-shape waveform could also be observed in the impact force waveforms of human skin and free-falling hollow balls.
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