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Study on the wearability and abrasion mechanism of braided harness cord

The wearability of braided harness cord was studied by measuring the tensile properties of worn ones with a universal electronic strength tester and wearing test device developed in our laboratory. The abrasion mechanism of harness cord was investigated, and the fractured schematic diagram was proposed according to the morphology observed by a hand USB microscope and scanning electron microscope. The results indicated the abrasive action could significantly reduce the tensile properties of harness cord, and a negative linear correlation between the tensile properties and the abrasive times was observed. The morphology suggested the fractured process of harness cord could be divided into five stages: surface abrasion of sheath fibers, partial breakage of sheath fibers, structure failure, full breakage of sheath fibers, and breakage of core fibers. In addition, the fibers in harness cord presented different fracture types due to the combined effect of external friction, bending, stretching, and fatigue during the wearability test.