arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2604.20437cond-mat.soft
收藏

通过接近阻塞相边界的结构记忆编程软复合材料的应变刚性

Programming strain-stiffening in soft composites via structural memory near jamming

The Hong Kong University of Science and Technology(香港科技大学);Chinese Academy of Sciences(中国科学院);Université de Montpellier(蒙彼利埃大学)

Yiqiu Zhao, Deng Pan, Yiming Pang, Jonathan Barés, Chang Xu, Che Liu, Haitao Hu, Yuliang Jin, Qin Xu

AI总结:

研究通过接近阻塞相边界的机械训练协议,揭示结构记忆驱动软复合材料从颗粒状到生物聚合物状应变刚性的转变,提出非平衡记忆效应驱动的可编程应变刚性设计策略。

摘要:

由离散包含物嵌入在柔顺基质中的软复合固体正成为工程合成组织和软机器人材料的候选材料。目前控制其非线性力学(如应变刚性)的策略主要依赖于聚合物基质的非线性弹性。尽管包含物之间的直接接触可能在高密度下增强刚性响应,但无序接触网络的非平衡和历史依赖性质在复合力学中的作用尚不清楚。在本工作中,通过应用接近剪切阻塞相边界的机械训练协议,我们证明了接触网络中编码的结构记忆驱动从颗粒状到生物聚合物状应变刚性的转变。粗粒度复合模型的模拟显示,这种生物聚合物状机械响应源于近阻塞接触网络的增强非仿射重构。不依赖基质非线性,我们建立了一种设计策略,利用粒状系统固有的非平衡记忆效应,实现软复合材料的高可编程应变刚性。

英文摘要:

Soft composite solids, comprising discrete inclusions embedded within a compliant matrix, are emerging candidates for engineering synthetic tissues and soft robotic materials. Current strategies for controlling their nonlinear mechanics, such as strain-stiffening, have primarily relied on the nonlinear elasticity of polymer matrices. Although direct contacts between inclusions may enhance stiffening responses at high densities, the role of the non-equilibrium and history-dependent nature of disordered contact networks in composite mechanics remains unexplored. In this work, by applying a mechanical training protocol near a shear-jamming phase boundary, we demonstrate that the structural memory encoded in contact networks drives a crossover from granular-like to biopolymer-like strain stiffening. Simulations of a coarse-grained composite model reveal that this biopolymer-like mechanical response emerges from enhanced non-affine reconfigurations of nearly-jammed contact networks. Without relying on matrix nonlinearity, we establish a design strategy that leverages non-equilibrium memory effects intrinsic to granular systems to achieve highly programmable strain-stiffening in soft composites.

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。

↑