Abstract

Despite the importance and complexity of Poisson’s effect in tubular braids, it has been overlooked in researches investigating the mechanical properties. In this study, the effect of structural parameters on the Poisson’s Ratio (PR) of tubular braid was investigated. For this purpose, braids with different structural parameters such as braid angle, weave pattern, yarn count and the structural layer and structural axis was produced. Then, the PR of braids was evaluated and expressed in different structural deformation regimes by image processing technique. Results showed that Among the factors studied, braid angle had a prominent effect on the initial PR, in a way as the braid angle increased the magnitude of PR decreased. By increasing the floating length of yarns, initial PR increased. By increasing the yarn’s count and structural layers of tubular braids, initial PR decreased. Triaxial braids have lower initial PR in comparison to biaxial braids.

摘要

尽管泊松效应在管状编织物中的重要性和复杂性，但在调查机械性能的研究中却被忽视了。在这项研究中，研究了结构参数对管状编织物泊松比 (PR) 的影响。为此，生产了具有不同结构参数的编织物，例如编织角度、编织图案、纱线支数以及结构层和结构轴。然后，通过图像处理技术在不同的结构变形状态下评估和表达辫子的 PR。结果表明，在所研究的因素中，编织角对初始 PR 有显着影响，随着编织角的增加，PR 的幅度减小。通过增加纱线的浮动长度，初始 PR 增加。通过增加纱线的支数和管状编织层的结构层，初始 PR 降低。与双轴编织物相比，三轴编织物的初始 PR 较低。