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arXiv 2206.04444cond-mat.soft
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非线性弹性介质中的广义应力校正

Generic Stress Rectification in Nonlinear Elastic Media

Félix Benoist, Guglielmo Saggiorato, Martin Lenz

摘要:

非线性介质中的应力传播在细胞生物学中是至关重要的,其中分子马达在纤维状细胞骨架上施加各向异性力偶极子。虽然力偶极可以是收缩的或膨胀的,但由在压缩下弯曲的纤维制成的介质将这些应力矫正为生物学上至关重要的收缩。然而,缺乏对这种整流现象作为介质弹性的函数的一般理解。在这里,我们使用理论连续弹性表明,矫正实际上是一个非常普遍的效果,在非线性材料受到各向异性的内部应力。我们分析表明,bucklable和本构线性材料的几何非线性纠正小的收缩力,而粒状材料纠正膨胀。使用模拟,我们还表明,这些结果扩展到更大的力量。除了纤维网络,这些结果可以揭示应力在脆性或颗粒状材料中的传播,随后的局部塑性重排。

英文摘要:

Stress propagation in nonlinear media is crucial in cell biology, where molecular motors exert anisotropic force dipoles on the fibrous cytoskeleton. While the force dipoles can be either contractile or expansile, a medium made of fibers which buckle under compression rectifies these stresses towards a biologically crucial contraction. A general understanding of this rectification phenomenon as a function of the medium's elasticity is however lacking. Here we use theoretical continuum elasticity to show that rectification is actually a very general effect in nonlinear materials subjected to anisotropic internal stresses. We analytically show that both bucklable and constitutively linear materials subjected to geometrical nonlinearities rectify small forces towards contraction, while granular-like materials rectify towards expansion. Using simulations, we moreover show that these results extend to larger forces. Beyond fiber networks, these results could shed light on the propagation of stresses in brittle or granular materials following a local plastic rearrangement.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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