Title: Evolution of Maximum Bending Strain on Poisson's Ratio Distribution Show Chinese title

Title: 泊松比分布上的最大弯曲应变演变

Abstract: In recent years, new flexible functional materials have attracted increasing interest, but there is a lack of the designing mechanisms of flexibility design with superstructures. In traditional engineering mechanics, the maximum bending strain (MBS) was considered universal for describing the bendable properties of a given material, leading to the universal designing method of lowering the dimension such as thin membranes designed flexible functional materials.In this work, the MBS was found only applicable for materials with uniformly distributed Poisson's ratio, while the MBS increases with the thickness of the given material in case there is a variation Poisson's ratio in different areas. This means the MBS can be enhanced by certain Poisson's ratio design in the future to achieve better flexibility of thick materials. Here, the inorganic freestanding nanofiber membranes, which have a nonconstant Poisson's ratio response on stress/strain for creating nonuniformly distributed Poisson's ratio were proven applicable for designing larger MBS and lower Young's modulus for thicker samples. Show Chinese abstract

Abstract: 近年来，新型柔性功能材料引起了越来越多的关注，但缺乏具有超结构的柔性设计机制。在传统工程力学中，最大弯曲应变（MBS）被普遍认为是描述给定材料可弯曲性能的指标，导致了降低维度的通用设计方法，例如设计薄膜以获得柔性功能材料。在本工作中，发现MBS仅适用于泊松比均匀分布的材料，而在不同区域存在泊松比变化的情况下，MBS会随着材料厚度的增加而增加。这意味着未来可以通过特定的泊松比设计来增强MBS，从而实现厚材料更好的柔性。在这里，证明了无机自立纳米纤维膜适用于设计更大的MBS和更低的杨氏模量，这些膜在应力/应变下表现出非恒定的泊松比响应，从而创建非均匀分布的泊松比。