期刊论文

Linear Viscoelastic Model for Ballistic Gelatin at Medium Time Scales

Fan, Yurun(yurunfan@zju.edu.cn)

中文

高分子材料科学与工程

1000-7555

2018

34

12

95-100

10.16865/j.cnki.1000-7555.2018.12.016

国家自然科学基金创新研究组资助项目(51221004).

本校为其他机构

在不同时间尺度下,明胶表现出不同的黏弹性行为。应用蠕变和应力松弛模式研究质量分数为10%的弹道明胶在中等时间尺度下的线性黏弹性行为。低剪切速率下的连续加载-卸载实验显示,在常规感知的时间尺度下(~1min)弹道明胶接近完全弹性体,其线性区应变范围为0~0.25。对蠕变实验对应的中等时间尺度(>1h),选择样品老化24h作为实验起点,这时明胶结构缓慢老化带来的影响可以忽略,从而能够构建恒定参数的本构方程来描述弹道明胶的线性黏弹性行为。对1组蠕变实验结果进行分析,可确定Burgers模型的4个粘弹性参数,然后使用该组参数的模型预测另外2组蠕变实验以及应力松弛实验。结果表明Burgers模型能较好地...

Ballistic gelatin is widely used as physical surrogate of biological tissues to simulate blunt impact and blast loading effect on human tissue. Gelatin shows different viscoelastic behaviors at different time scales. The linear viscoelastic behavior of 10% gelatin at medium time scales was studied by rheological creep and relaxation experiments. According to the results of aging experiments of ballistic gelatin, the onset of creep experiment is selected after 24 h of aging, so that the intricate influence of gelatin structural aging during the ...