Effects of strain rate, mixing ratio, and stress-strain definition on the mechanical behavior of the polydimethylsiloxane (PDMS) material as related to its biological applications
Effects of strain rate, mixing ratio, and stress-strain definition on the mechanical behavior of the polydimethylsiloxane (PDMS) material as related to its biological applications
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DOI：
10.1007/s10544-008-9256-6
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发表时间：
2009-04-01
影响因子：
2.8
通讯作者：
Berguer, Ramon
中科院分区：
文献类型：
--
作者：
Khanafer, Khalil;Duprey, Ambroise;Berguer, Ramon
通过对聚二甲基硅氧烷（PDMS）材料的拉伸试验，研究了混合比、应力-应变曲线的定义、应变速率对弹性模量和应力-应变曲线的影响。根据弹性材料的ASTM标准制备PDMS试样。我们的研究结果表明，生理弹性模量强烈依赖于应力-应变曲线的定义，混合比，和应变速率。对于各种混合比和应变率，与工程应力-应变和真应力-工程应变定义相比，真应力-应变定义导致更高的应力和弹性模量。弹性模量随着混合比增加而增加，直到9：1的比例，之后弹性模量开始降低，即使混合比继续增加。本研究的结果将有助于设计体外实验来模拟动脉中的血流，并有助于理解使用PDMS弹性体的血流与动脉壁之间的复杂相互作用。
Tensile tests on Polydimethylsiloxane (PDMS) materials were conducted to illustrate the effects of mixing ratio, definition of the stress-strain curve, and the strain rate on the elastic modulus and stress-strain curve. PDMS specimens were prepared according to the ASTM standards for elastic materials. Our results indicate that the physiological elastic modulus depends strongly on the definition of the stress-strain curve, mixing ratio, and the strain rate. For various mixing ratios and strain rates, true stress-strain definition results in higher stress and elastic modulus compared with engineering stress-strain and true stress-engineering strain definitions. The elastic modulus increases as the mixing ratio increases up-to 9:1 ratio after which the elastic modulus begins to decrease even as the mixing ratio continues to increase. The results presented in this study will be helpful to assist the design of in vitro experiments to mimic blood flow in arteries and to understand the complex interaction between blood flow and the walls of arteries using PDMS elastomer.