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The potential for major extrapolation of creep rupture and creep strain data

机译：蠕变破裂和蠕变应变数据的重大外推潜力

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A set of creep rupture data, for which two independent investigators have previously published models, is re-examined using the recently proposed parametric numerical isothermal datum (P-NID) approach to modelling. It is shown that neither of the existing models can be presumed reliable in extrapolation. In contrast, P-NID models are found to represent the data with much greater accuracy and to satisfy appropriate criteria for reliability in extrapolation. According to the principles of this approach, the close correspondence between the P-NID models and the data justifies extrapolation in rupture time at mid-range and lower test temperatures in excess of 15-fold. This expectation is confirmed by excluding from the analysis all data at more than 7% of the longest known rupture life, then comparing the resultant extrapolation to the excluded data. The; success of the procedure suggests a potential for greatly reducing the extent of rupture testing necessary to produce reliable extrapolation to times of practical interest. This is demonstrated for a set of data including simulated results at intermediate temperatures. The study shows a potential reduction to less than one-tenth of the aggregate test time conventionally considered necessary. The analysis of further sets of rupture data shows how a P-NID model may reliably be extrapolated even when the material behaviour necessitates a model partitioned according to temperature range, or exhibits instability. Limited investigation indicates that, for a given material, creep strain data are consistent with parametric models for rupture data and may be extrapolated over similar intervals.
机译：使用最近提出的参数化数值等温基准（P-NID）方法进行建模，重新检查了一组蠕变破裂数据，两个独立的研究人员此前已针对这些数据进行了建模。结果表明，现有模型都不能推定为可靠的。相反，发现P-NID模型可以以更高的精度表示数据并满足外推可靠性的适当标准。根据这种方法的原理，P-NID模型与数据之间的紧密对应关系证明了在中等温度和低于15倍的较低测试温度下的破裂时间外推是合理的。通过从分析中排除所有已知最长断裂寿命超过7％的数据，然后将所得的外推值与排除的数据进行比较，可以确认这一期望。的;该程序的成功表明，有可能极大地减少必要的破裂测试的范围，以将破裂次数可靠地推算到实际需要的时间。包括中间温度下的模拟结果在内的一组数据证明了这一点。研究表明，这种方法可以将总测试时间减少到通常认为必要的十分之一以下。对其他破裂数据集的分析表明，即使材料行为需要根据温度范围划分模型或表现出不稳定性，也可以可靠地推断P-NID模型。有限的研究表明，对于给定的材料，蠕变应变数据与破裂数据的参数模型一致，并且可以在相似的时间间隔内推断。

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