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发明授权
CN106769531B 一种低硬度P91管件持久曲线外推函数的建立方法 有权 转让

一种低硬度P91管件持久曲线外推函数的建立方法
摘要：
本发明公开了一种低硬度P91管件持久曲线外推函数的建立方法，包含以下步骤：获取一组正常硬度值HB1及一组较低硬度值HB2的P91无缺陷试样的570℃持久断裂数据；根据公式P(tr,HB)＝(1000‑HB)(logtr+C)和使用优化法获得使P与f(σ)之间具有最佳相关系数R2的C值，以使函数与实验数据的吻合性更好；根据公式P(tr,HB)＝(1000‑HB)(logtr+C)和log10(σ)＝a+b*ln(P)+c*(ln(P))2，拟合得到相关系数a、b、c的数值；由已知C值的公式P(tr,HB)＝(1000‑HB)(logtr+C)和已知a、b、c值的公式log10(σ)＝a+b*ln(P)+c*(ln(P))2外推其他硬度值P91部件的持久曲线。本发明计算过程简单、快速，可广泛用于不同硬度Gr.91钢570℃持久曲线外推函数的建立和持久强度的外推。
摘要（英）：

The invention discloses a building method of a persistent curve extrapolation function of a low-hardness P91 pipe fitting. The method comprises the following steps of obtaining persistent fracture data at 570 DEG C of a P91 flawless specimen with a group of normal hardness values HB1 and a group of relatively low-hardness values HB2; obtaining a C value with the best correlation coefficient R2 between P and f(sigma) by using an optimization method according to the formula as shown in the specification to make the conformity of the function and experiment data better, fitting to obtain the values of correlation coefficients a, b and c according to the formulas as shown in the specification; and extrapolating the persistent curve of other hardness value P91 components according to the formula of the known C value and the formula of the values a, b and c. The building method is simple and fast in calculation process, and can be widely applied to building of the persistent curve of Gr.91 steel of different hardness at 570 DEG C and extrapolation of the persistent strength.

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