Computational lifetime prediction of hydrogen influenced lubricated rolling contact components –CoLifeHy–

轴承中的钢制滚动体会发生氢助滚动接触疲劳（HARCF），这是一个严重的问题，具有巨大的经济影响。这种轴承用于包括风力涡轮机的许多应用中。本项目的目的是实现定量寿命预测的轴承组件进行HARCF损坏。这将通过基于可靠的实验分析开发数值模拟模型来实现。氢在轴承钢中的扩散是一个多方面的问题，取决于材料行为、材料处理和表面处理工艺。该项目计划的模拟应能够模拟应力辅助氢扩散作为氢含量的函数及其对钢的机械响应、氢陷阱密度和材料内应力的影响。为此，设计了一个全面的实验方案，以帮助补充数值模拟模型。为了实现定量寿命预测，将对氢气预充样品进行全轴承滚动接触疲劳试验。试样中的氢含量将通过充氢曲线准确测定。在整个项目中应用和开发的方法将使知识转移到其他应用程序和系统。

Steel rolling elements in bearings undergo hydrogen-assisted rolling contact fatigue (HARCF), which is a serious problem with drastic economic implications. Such bearings are used in numerous applications including wind turbines. The aim of this proposed project is to achieve quantitative lifetime predictions of bearing components undergoing HARCF damage. This will be achieved through the development of numerical simulation models based on reliable experimental analyses.Hydrogen diffusion in bearing steel is a multifaceted problem that depends on the material behavior and material handling and surface conditioning processes. The simulations planned in this project should be able to model stress-assisted hydrogen diffusion as function of hydrogen content and its effect on the mechanical response of steel, hydrogen trap density and internal stresses in the material. For this reason a comprehensive experimental program was designed to help complement the numerical simulation model. To achieve quantitative lifetime predictions, full-bearing rolling contact fatigue tests on hydrogen gas pre-charged samples will be conducted. The hydrogen content in the samples will be accurately determined through charging curves. The methods applied and developed throughout this project will enable transfer of knowledge to other applications and systems.