Abstract

Under quasi-static loading an irregular failure mode of high-strength thin-carbon steel cords were observed after low temperature thermal aging. Character and kinetics of damage in such wire ropes highly depend on the plastic elongation of the steel wires, which is significantly modified by the strain aging effect. In this paper, the static strain aging effect on heavily drawn high-carbon steel wires and their cords is experimentally studied in the 100–200 °C temperature range. Quantitative analysis of the affected strength and strain parameters is given. Kinetics of the aging process is discussed, and based on this, the macroscopic failure mechanism is fundamentally explained.

Highlights

  • One of the most interesting applications of strands made of high strength steel wires is the reinforcement of high-pressure flexible pipes

  • These types of flexible pipes are typically used in the oil industry, where they can be exposed to extremely high pressure up to more than 300 MPa [1]

  • The saturation character of static strain ageing (SSA) on the investigated high-carbon steel wires has been proven in the temperature range 125–200 °C

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Summary

Introduction

One of the most interesting applications of strands made of high strength steel wires is the reinforcement of high-pressure flexible pipes. The embedding of strands into rubber layers is followed by the vulcanization procedure at around 150 °C This temperature is high enough to start, or even to complete the strain ageing process of the wires. This question is highly important in the case of steel cords that contain wires with different diameters Another relevant question to be answered is how the damage of the strands is affected by SSA. In this study we are looking for the answer to the questions raised above For this reason, high-carbon steel wires—with specific diameter, chemical composition and strength—and two different types of steel strands (Warrington and compact) that are used as reinforcement materials for high-pressure oil hoses are investigated. Consequences to engineering applications and their resolutions are discussed

Materials and Methods
Kinetic character of static strain aging effect on wires
Abnormal sequential break of Warrington steel cords
Conclusions

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