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 80–200 °C temperature range. The kinetics of the aging process is studied in detail. Experimental data are fit by the Johnson–Mehl–Avrami–Kolmogorov (JMAK) kinetic model. The temperature dependence of the static strain aging process is given by means of the Arrhenius equation. The associated JMAK exponents, the apparent activation energy and the pre-exponential constant are determined. Quantitative analysis of the affected strength and strain parameters is given, and based on this, the macroscopic failure mechanism is fundamentally explained.
Highlights
High-pressure flexible pipes are a unique field of application of high-strength carbon steel wires and strands made of them
The yield strength of Ø0.71 wire is determined after isothermal aging at temperature levels in the 80–200 ◦ C range (Figure 2)
Yield strength was determined in as-drawn conditions
Summary
High-pressure flexible pipes are a unique field of application of high-strength carbon steel wires and strands made of them. These reinforcement plies are embedded in rubber. Pedro Oliveira, Eric D. van and give the primary strength of the composite hose structure while they keep its flexibility. These pipes are typically used in the oil and gas industry, where extreme high. Jae-chun Lee and Alex Lanzutti loads is challenging and highly based on proper information about the mechanical characteristics of the steel strands, especially their tensile properties. Received: 30 September conditions, any phenomena that may affect the mechanical behavior of the steel plies 2must.
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