高性能纤维扭转疲劳断裂研究

Study on torsional fatigue fracture of high-performance fiber

在自制的扭转疲劳装置上,进行对位芳纶和超高相对分子质量聚乙烯(UHMWPE)纤维扭转疲劳实验,分析扭转机理及其扭转疲劳断口形貌特征。结果显示,相同条件下,UHMWPE纤维的耐扭转疲劳性能优于对位芳纶。对位芳纶扭转疲劳断口呈现原纤分裂,UHMWPE纤维皮层呈蠕变特征,芯层有脆性断裂特征。

The torsion fatigue test was conducted on para-aromatic fiber and ultrahigh-molecular weight polyethylene ( UH-WPE) by using self-developed torsion fatigue apparatus. The mechanism and morphology of their torsional fatigue fracture were analyzed. The experimental results showed that UHWPE fiber was superior to para-aromatic fiber in resistance to torsion fatigue. Fibrillation cleavages were observed on torsional fatigue fracture ends of para-aromatic fiber while creep characteristics was observed on the skin of UHMWPE fiber and the brittle rupture in the core.