A feasible method for the estimation of the interval bounds based on limited strain-life fatigue data

•The intervals are established by omitting points within limited test data points.•The eRMSE is introduced to tell the uncertainty from the unreasonable deviation.•The proximities from the lower bounds to the R95C95 curves show the effectiveness. A feasible method for the estimation of the interval...

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Bibliographic Details
Published in:International journal of fatigue 2018-11, Vol.116, p.172-179
Main Authors: Gu, Zhengqi, Ma, Xiaokui
Format: Article
Language:English
Subjects:
Data points
Estimates
Fatigue tests
Feasibility
Interval bounds
Interval establishment
Limited test data
Materials fatigue
Omitting points
Parameter modification
Strain
Strain-life fatigue
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Summary:•The intervals are established by omitting points within limited test data points.•The eRMSE is introduced to tell the uncertainty from the unreasonable deviation.•The proximities from the lower bounds to the R95C95 curves show the effectiveness. A feasible method for the estimation of the interval bounds based on strain-life fatigue data is presented. The deviation from each point to the traditional fitting line is considered as the fatigue uncertainty. With groups of different test data points, new strain-life lines are fitted and the expand-root-mean-square-error is introduced as the index of grouped data points. The interval bounds are represented by the covered range of all these lines. Accordingly, the modified interval bounds of four strain-life parameters are obtained. Finally, the fatigue tests on a few samples of three materials are given as examples to show the effectiveness of the method.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2018.06.024