ABSTRACT Uniaxial creep life data is still used to estimate long-term creep strength and maximum allowable design stresses for structural materials. Many ‘single-line’ equations have been developed to correlate uniaxial creep life data, such as the Larson-Miller Parameter (LMP) and Wilshire (WS) equations; few are derived from the physics of creep. Some forms of these equations can be mathematically inconsistent with the behaviour of metals at high temperatures, making them potentially unreliable predictors of long-term life. Two modified hyperbolic sine minimum creep rate equations combined with the Monkman-Grant equation were used to correlate uniaxial creep life data of Sanicro 25 and HR6W, and then calculate their long-term creep strength. A modified hyperbolic sine equation was selected because it has a physical basis in dislocation creep and is numerically stable. It was found that the modified hyperbolic sine equations fit the experimental data as well as the LMP and WS equations.

中文翻译：

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应用修正的双曲正弦蠕变速率方程关联 Sanicro 25 和 HR6W 的单轴蠕变断裂数据

摘要 单轴蠕变寿命数据仍用于估算结构材料的长期蠕变强度和最大允许设计应力。已经开发了许多“单线”方程来关联单轴蠕变寿命数据，例如 Larson-Miller 参数 (LMP) 和 Wilshire (WS) 方程；很少有来自蠕变物理学的。这些方程的某些形式在数学上可能与金属在高温下的行为不一致，使它们成为可能不可靠的长期寿命预测指标。两个修正的双曲正弦最小蠕变速率方程结合 Monkman-Grant 方程被用来关联 Sanicro 25 和 HR6W 的单轴蠕变寿命数据，然后计算它们的长期蠕变强度。选择修正的双曲正弦方程是因为它具有位错蠕变的物理基础并且数值稳定。发现修改后的双曲正弦方程与实验数据以及 LMP 和 WS 方程拟合。