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首页> 外文期刊>Materials at High Temperatures >Effect of oxidation on creep data: Part 2 - A procedure for assessing the effect of oxidation on constant-stress or constant-load creep curves using the Theta-projection concept
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Effect of oxidation on creep data: Part 2 - A procedure for assessing the effect of oxidation on constant-stress or constant-load creep curves using the Theta-projection concept

机译：氧化对蠕变数据的影响：第2部分-使用Theta投影概念评估氧化对恒定应力或恒定载荷蠕变曲线的影响的过程

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摘要

A procedure based on Theta-methodology coupled with the knowledge of oxidation kinetics is envisaged for quantitatively assessing the effect of oxidation on creep curves. The procedure is based on the generation of a series of real constant-stress creep curves, at different stress and temperature levels, in inert atmosphere, where the effects due to oxidation are kept to a minimum level. Stress enhancement factors due to the effect of area reduction on specimen cross-section with plastic deformation and oxidation are defined for constant-stress or constant-load creep testing. These factors can be used in the integration of the strain-rate equation related to the 40 - parameter analysis, to derive constant-stress or constant-load curves in air using either the strain hardening or time hardening theories. Although systematic constant-stress creep data in vacuum are not yet available to test the methodology effectively, a preliminary simulation is done to demonstrate how the model works, to check its performance and the possibilities of analysis.
机译：设想了一种基于Theta方法和氧化动力学知识的方法，用于定量评估氧化对蠕变曲线的影响。该程序基于在惰性气氛中在不同应力和温度水平下一系列实际恒应力蠕变曲线的生成，其中氧化引起的影响保持在最低水平。对于恒定应力或恒定载荷蠕变测试，定义了由于面积减小对试样横截面的影响而产生的应力增强因子，该截面具有塑性变形和氧化作用。这些因素可用于与40参数分析有关的应变率方程的积分，以使用应变硬化或时间硬化理论得出空气中的恒定应力或恒定载荷曲线。尽管尚无法获得真空中的系统恒应力蠕变数据来有效地测试该方法，但已进行了初步仿真以演示该模型如何工作，检查其性能以及分析的可能性。

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