低密度山羊绒纤维集合体的压缩性能

Compressibility of Cashmere Fibrous Assembly with Low Packing Density

采用变密度纤维集合体力学和传导性原位综合测量系统,测试低密度山羊绒纤维集合体在压缩及回复过程中的受力情况,通过计算特征值对集合体的压缩性能进行表征。结果表明:低密度的山羊绒纤维集合体在压缩的初始阶段,空隙率为主导因素,力-位移曲线和模量曲线均比较平缓;压缩结束阶段,集合体内纤维间的挤压占主导因素,挤压变形为主,特征曲线斜率表现为急剧增大;回复曲线表现出明显的滞后性,表明一次压缩回复过程中存在能量损耗。另外分别对压缩、回复曲线积分可计算一次循环过程中的压缩功、回复功以及能量损耗。

A FACBES （fiber assembly complex behavior evaluation system） was used to investigate compressional behavior of cashmere fibrous assembly with low packing density, and some structural values were calculated to characterize compressional properties. Results show that porosity may be the essential factor during the initial stage of compressional test, and the slopes of force-replacement and modulus curves are quite smooth. Extrusion between fibers which leads to extrusion deformation is more significant when the compressional test comes to the final stage, and the slopes of curves increase sharply. Pronounced hysteresis during recovery stages demonstrates the existence of energy loss. In addition, compressional energy, recovery energy and energy loss are calculated during one successful circle.