In this paper the influences of the drawing temperature on physical structures and properties of PET filaments have been studied. The results show that the temperatures of the first-stage drawing will have significant...In this paper the influences of the drawing temperature on physical structures and properties of PET filaments have been studied. The results show that the temperatures of the first-stage drawing will have significant effects on birefringence development of filaments during the second stage drawing, as well as the oriented amorphous filaments change to crystanine-oriented filaments after heat treatment. Increasing temperature of the second-stage drawing can be greatly increasing the crystallinity and decreasing the dry heat shrinkage of the filaments.展开更多
基于ABAQUS软件模拟了Ф0.5 mm TC4钛合金细丝拉拔过程。结果表明,沿试样轴向,在试样和模具压缩椎接触区域残余应力较大;沿试样径向,残余应力最小值分布区域随着模具压缩角发生改变。随着压缩率增加,试样外侧残余应力最大值分布区域增...基于ABAQUS软件模拟了Ф0.5 mm TC4钛合金细丝拉拔过程。结果表明,沿试样轴向,在试样和模具压缩椎接触区域残余应力较大;沿试样径向,残余应力最小值分布区域随着模具压缩角发生改变。随着压缩率增加,试样外侧残余应力最大值分布区域增加。压缩率大于50%时,试样断裂。拉拔温度随着模具压缩角和压缩率的增大而增加。实际生产时设置道次压缩率小于20%,总压缩率小于50%,模具压缩角小于25°最为合适。展开更多
文摘In this paper the influences of the drawing temperature on physical structures and properties of PET filaments have been studied. The results show that the temperatures of the first-stage drawing will have significant effects on birefringence development of filaments during the second stage drawing, as well as the oriented amorphous filaments change to crystanine-oriented filaments after heat treatment. Increasing temperature of the second-stage drawing can be greatly increasing the crystallinity and decreasing the dry heat shrinkage of the filaments.
文摘基于ABAQUS软件模拟了Ф0.5 mm TC4钛合金细丝拉拔过程。结果表明,沿试样轴向,在试样和模具压缩椎接触区域残余应力较大;沿试样径向,残余应力最小值分布区域随着模具压缩角发生改变。随着压缩率增加,试样外侧残余应力最大值分布区域增加。压缩率大于50%时,试样断裂。拉拔温度随着模具压缩角和压缩率的增大而增加。实际生产时设置道次压缩率小于20%,总压缩率小于50%,模具压缩角小于25°最为合适。
