Abstract
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.
Highlights
The authors develop an impact force sensor that can accurately measure a high-speed impact force waveform and apply the sensor to impact tests of several soft materials
Experiments are carried out using compact drop test equipment under a flat frontal impact condition [1]-[3]
The impact force waveforms of soft materials were examined based on a drop impact experiment and a dynamics model
Summary
The authors develop an impact force sensor that can accurately measure a high-speed impact force waveform and apply the sensor to impact tests of several soft materials. In a flat frontal impact, a free-falling drop hammer with a flat bottom surface strikes a plate-like soft material in the normal direction. (2016) Viscosity Transient Phenomenon in Drop Impact Testing of Soft Material. In the impact testing of soft materials, a thorn-shaped waveform (spike-like feature) has appeared in previous experiments [4]-[6]. The authors demonstrate that the feature of the impact force waveform can be qualitatively simulated by a standard linear solid (SLS) model [2]. The influences of strain rate and impact area on the thorn-shaped waveform are discussed based on the SLS model and the experimental results
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