有机高性能纤维材料的轴向压缩变形行为

介绍了利用偏光显微镜、扫描电子显微镜及Ｘ射线衍射等方法研究具有伸直链结构的有机高性能纤维及膜材料的轴向压缩变形行为。在初级变形阶段，因晶面滑移形成与纤维轴呈一定角度并较有规则的变形带。变形带内大分子受剪切作用发生挫屈或折断。随变形程度增加，变形带堆积厚度以及分布密度增大。如果继续增大变形程度，微原纤维间的相对滑移使材料大分子发生剧烈的侧向位移、高度取向和结晶材料所特有的结构各向异性同性化，试样轴向长度明显缩短，最终导致破坏。

Compressional Behavior of Organic High-performance Fibrous Materials

The present work is concerned with the axial compressional behavior of Organic high-performance fibers and filmes by means of polarizing optical microscopy,scanning electron microscopy and X-ray diffraction.In the initial stage of compression,kink bands are formed at a proper angle to the draw axis,the molecular chains within the band were broken or bent,that local crystalline slip systems are responsible for the formation of the kink band.With progressive compression,new kink bands were formed near the kink bands that were formed in the initial stage of compression,indicating that compressional stress is concentrated at regions near the kink bands.In the final stage of compression,massive lateral displacement occurred from place to place along fiber axis and the fiber was almost sqeezed out of shape.It can be assumed that intermicrofibrillar slip plays an important role at the final state of compression.