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首页> 外文期刊>Journal of Applied Polymer Science >Mechanical Properties of Bombyx mori Silk YarnsStudied with Tensile Testing Method
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Mechanical Properties of Bombyx mori Silk YarnsStudied with Tensile Testing Method

机译：拉伸试验法研究家蚕真丝纱的力学性能

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摘要

The mechanical properties of Bombyx morisilk yarns and baves were investigated with tensile testingmethod. After silk yarns were pre-extended at differentstrain levels and fixed for a while followed by recoveryprocess, the tensile characteristics were examined in detail.It was commonly observed that low preliminary exten-sions up to 2-3% do not cause the changes of the mechani-cal properties and stress-strain curves because they resultin small structural changes and distortions, which wererecovered within relatively short time 1 min) in recov-ery process. However, pre-extension values >3% strainlead to great changes of the mechanical properties andfibre structure, i.e., the changes of the shape of stress-strain curve where additional transition point wasobserved, increase in the rigidity and stress at rupture, butdecrease in extensibility as a result of orientation anddestruction of the fibre structure especially in the amor-phous region. It was stated that silk fibre consists of twodistinct deformation regions, namely first linear regionextending up to 2-3% strain and the second region beyond2-3% strain where the main reorganization processes ofthe fibre structure, that is, the straining of macromolecularchains especially in the amorphous regions, the orientationof structural units such as β-sheet microcrystals in stretch-ing direction, and the destruction of macromolecules takeplace.
机译：用拉伸试验方法研究了Bombyx morisilk纱线和轻纱的力学性能。将丝线在不同的应变水平下预拉伸并固定一会儿，然后进行恢复过程后，将详细检查其拉伸特性。通常观察到，低至2-3％的低初始伸长率不会引起纱线的变化。力学性能和应力-应变曲线，因为它们会导致小的结构变化和变形，这些变化和变形在相对较短的1分钟内即可恢复。但是，预拉伸值> 3％会导致机械性能和纤维结构发生很大变化，即观察到附加过渡点的应力-应变曲线的形状发生变化，断裂时的刚度和应力增加，但延伸性降低由于纤维结构的定向和破坏，特别是在非晶体区域。有人说，蚕丝纤维由两个不同的变形区域组成，即第一线性区域延伸至2-3％应变，第二区域超出2-3％应变，这是纤维结构的主要重组过程，即大分子链的应变，特别是在非晶区，结构单元如β-片状微晶在拉伸方向上的取向以及大分子的破坏发生。

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