On Factors Affecting Fatigue Life of Stranded-wire Helical Spring

doi:10.3969/j.issn.1000-1093.2022.02.024

Abstract

Abstract: Stranded-wire helical spring (SWHS) is a kind of cylindrical helical spring formed by twisting multiple steel wires into steel strands. At present, there are few studies on fatigue failure of SWHS. For the fatigue failure of SWHS in practical application, the influences of the fracture characteristics of SWHS steel wire and the geometrical parameters of SWHS on SWHS fatigue life are analyzed and studied. The analyzed results show that the surface defect of steel wire is the main reason that causes crack initiation and reduces fatigue life, and the geometric parameters of SWHS have also an effect on its fatigue life. The surface defects of steel wire include the line patterns, scars, pits, etc. In addition, the micro-holes and micro-cracks inside the steel wire material would accelerate the crack growth and reduce the fatigue life of spring. Among the geometric parameters of SWHS, the restoring force under the maximum vibration amplitude is taken as a variable, the effect of spring helix angle α on fatigue life of SWHS is the greatest, followed by spring winding ratio C and steel wire twist angle β.

Key words: stranded-wirehelicalspring, fatiguelife, surfacedefect, crackinitiation, geometricparameter

CLC Number:

TG111.8

ZHANG Rui, YI Lili, LIU Zhipeng. On Factors Affecting Fatigue Life of Stranded-wire Helical Spring[J]. Acta Armamentarii, 2022, 43(2): 458-466.

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