Modeling of hydrogen-induced fracture toughness degradation of pipe steel
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Abstract
A correction to the existing hydrogen-induced fracture toughness degradation model was introduced. We formulated a new degradation model that simplifies predictions without compromising accuracy, effectively reducing the mean absolute error from 93 N/mm to 1.4 N/mm on experimental data – a reduction of more than 90 times. The fundamental difference between degraded steel and its as-delivered (reserve) state was demonstrated, and two separate models were proposed for each case. It was shown that the difference between using a constant stress value and the solution to the Lamé equation is only 2%, which justified simplifying the chosen diffusion equation to a classical form. An example application of the new model, together with the solution to the diffusion equation, was presented. The developed models were applied to the parameters of real pipes and validated against experimental data.
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