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首页> 外文期刊>Journal of the Mechanics and Physics of Solids >Thermally actuated shape-memory polymers: Experiments, theory, and numerical simulations
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Thermally actuated shape-memory polymers: Experiments, theory, and numerical simulations

机译：热致动形状记忆聚合物：实验，理论和数值模拟

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With the aim of developing a thermo-mechanically coupled large-deformation constitutive theory and a numerical-simulation capability for modeling the response of thermally actuated shape-memory polymers, we have (ⅰ) conducted large strain compression experiments on a representative shape-memory polymer to strains of approximately unity at strain rates of 10~(-3) and 10~(-1) s~(-1), and at temperatures ranging from room temperature to approximately 30 ℃ above the glass transition temperature of the polymer; (ⅱ) formulated a thermo-mechanically coupled large-deformation constitutive theory; (ⅲ) calibrated the material parameters appearing in the theory using the stress-strain data from the compression experiments; (ⅳ) numerically implemented the theory by writing a user-material subroutine for a widely used finite element program; and (ⅴ) conducted representative experiments to validate the predictive capability of our theory and its numerical implementation in complex three-dimensional geometries. By comparing the numerically predicted response in these validation simulations against measurements from corresponding experiments, we show that our theory is capable of reasonably accurately reproducing the experimental results. As a demonstration of the robustness of the three-dimensional numerical capability, we also show results from a simulation of the shape-recovery response of a stent made from the polymer when it is inserted in an artery modeled as a compliant elastomeric tube.
机译：为了发展热力学耦合的大变形本构理论和数值模拟能力来建模热致动形状记忆聚合物的响应，我们（ⅰ）对代表性的形状记忆聚合物进行了大应变压缩实验在10〜（-3）和10〜（-1）s〜（-1）的应变速率下，在室温至高于聚合物的玻璃化转变温度约30℃的温度范围内，产生大约1的应变； （ⅱ）提出了热力耦合大变形本构理论； （ⅲ）使用来自压缩实验的应力-应变数据校准理论中出现的材料参数； （ⅳ）通过编写用于广泛使用的有限元程序的用户材料子例程以数字方式实现该理论； （ⅴ）进行了具有代表性的实验，以验证我们的理论的预测能力及其在复杂三维几何中的数值实现。通过将这些验证模拟中的数值预测响应与来自相应实验的测量结果进行比较，我们表明我们的理论能够合理准确地再现实验结果。为了证明三维数值能力的鲁棒性，我们还显示了由聚合物制成的支架插入模型为顺应性弹性管的动脉时，其形状恢复响应的仿真结果。

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