arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2110.04897cond-mat.mtrl-scics.NAmath.NA
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结构变化对薄纤维材料本构响应和应变变化的影响

The influence of structural variations on the constitutive response and strain variations in thin fibrous materials

Mossab Alzweighi, Rami Mansour, Jussi Lahti, Ulrich Hirn, Artem Kulachenko

摘要:

细纤维网络结构特性的随机变化在很大程度上决定了其力学性能。为了评估局部结构变化对网络局部应变和机械响应的影响,我们提出了一种多尺度方法,结合建模,数值模拟和实验测量。基于微机械纤维网络模拟,描述在中尺度水平的响应的连续体模型。实验测得的厚度,密度,纤维取向和各向异性的空间领域,此后被用作输入到一个宏观尺度的有限元模型。后者用于模拟每个研究的结构特性的空间变异性的影响。此外,这项工作带来了新颖性,包括在生产过程中的干燥条件对纤维性能的影响。所提出的方法进行了实验验证,通过比较测量的应变场和单轴响应。结果表明,密度的空间变异性对局部应变场的影响最大,其次是厚度和纤维取向。同时,对于力学响应,相对于干燥约束的纤维取向角是关键的影响因素,其对力学性能的各向异性的贡献大于在纤维片材制造过程中形成的纤维各向异性的贡献。

英文摘要:

The stochastic variations in the structural properties of thin fiber networks govern to a great extent their mechanical performance. To assess the influence of local structural variability on the local strain and mechanical response of the network, we propose a multiscale approach combining modeling, numerical simulation and experimental measurements. Based on micro-mechanical fiber network simulations, a continuum model describing the response at the mesoscale level is first developed. Experimentally measured spatial fields of thickness, density, fiber orientation and anisotropy are thereafter used as input to a macroscale finite-element model. The latter is used to simulate the impact of spatial variability of each of the studied structural properties. In addition, this work brings novelty by including the influence of the drying condition during the production process on the fiber properties. The proposed approach is experimentally validated by comparison to measured strain fields and uniaxial responses. The results suggest that the spatial variability in density presents the highest impact on the local strain field followed by thickness and fiber orientation. Meanwhile, for the mechanical response, the fiber orientation angle with respect to the drying restraints is the key influencer and its contribution to the anisotropy of the mechanical properties is greater than the contribution of the fiber anisotropy developed during the fiber sheet-making.

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