‘Seeing’ Strain in Soft Materials
‘Seeing’ Strain in Soft Materials
复制标题
“看到”软材料中的应变
作者：
Z. Xia;V. D. Alphonse;Douglas B. Trigg;T. Harrigan;J. Paulson;Q. T. Luong;Evan P. Lloyd;Meredith H. Barbee;S. Craig
有几种技术可用于测量高速冲击条件下软材料的应变。这些技术包括高速拉伸试验、分离式霍普金森压杆试验、数字图像相关和高速X射线成像。然而，这些现有技术都不能在测试样本中产生连续的3D空间应变分布。在这里，我们报告了一种新的被动应变传感器的基础上，聚（二甲基硅氧烷）（PDMS）弹性体与共价结合螺吡喃（SP）机械基团测量冲击引起的应变。我们已经证明，将SP以0.25wt%的水平掺入PDMS中，可以在几分之一毫秒内在1500 s-1的高应变速率下通过颜色变化充分测量冲击应变。此外，颜色变化是完全可逆的，因此可以重复使用。该技术具有很高的潜力，可用于量化创伤性脑损伤应用的脑应变。
Several technologies can be used for measuring strains of soft materials under high rate impact conditions. These technologies include high speed tensile test, split Hopkinson pressure bar test, digital image correlation and high speed X-ray imaging. However, none of these existing technologies can produce a continuous 3D spatial strain distribution in the test specimen. Here we report a novel passive strain sensor based on poly(dimethyl siloxane) (PDMS) elastomer with covalently incorporated spiropyran (SP) mechanophore to measure impact induced strains. We have shown that the incorporation of SP into PDMS at 0.25 wt% level can adequately measure impact strains via color change under a high strain rate of 1500 s−1 within a fraction of a millisecond. Further, the color change is fully reversible and thus can be used repeatedly. This technology has a high potential to be used for quantifying brain strain for traumatic brain injury applications.
影响因子：
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作者：
W. Hardy;M. Mason;C. Foster;C. Shah;James M. Kopacz;King H. Yang;A. King;Jennifer L. Bishop
通讯作者：
W. Hardy;M. Mason;C. Foster;C. Shah;James M. Kopacz;King H. Yang;A. King;Jennifer L. Bishop