Dynamic Reciprocating Bending Fatigue of Webbing

摘要

Bending fatigue as a possible cause of degradation of textile webbings has been investigated using a dynamic bending apparatus. Changes in strength and thickness due to dynamic bending fatigue were measured on webbings used in automotive passenger restraints (seat belts). Influences of abrasion and webbing tension were also considered. Webbing strength dropped by about 8% after 500,000 fatigue cycles. Repeated bending also caused an increase in webbing thickness, indicating relative movement of fibers and yarns in the fabric. Some explanations for this behavior are given.