Influence of Staircase Fatigue Test Data Closed or Not onStatistical Estimation of Material Fatigue Strength

ZHENG Cheng; LU Qi; LI Hongtao

doi:10.11973/jxgccl202101007

Materials and Mechanical Engineering > 2021 > 45(1): 41-45. > DOI: 10.11973/jxgccl202101007

ZHENG Cheng, LU Qi, LI Hongtao. Influence of Staircase Fatigue Test Data Closed or Not onStatistical Estimation of Material Fatigue Strength[J]. Materials and Mechanical Engineering, 2021, 45(1): 41-45. DOI: 10.11973/jxgccl202101007

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Influence of Staircase Fatigue Test Data Closed or Not onStatistical Estimation of Material Fatigue Strength

1. Shanghai Key Laboratory for Engineering Materials Application and Evaluation, Shanghai Research Institute ofMaterials, Shanghai 200437, China;
2. Technical Center for Industrial Product and Raw Material Inspection andTesting of Shanghai Customs, Shanghai 200135, China

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Received Date: August 10, 2020
Revised Date: November 25, 2020

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Abstract

Two types of unclosed staircase chart were cited, and reasonable assumptions were made on the test results that may appear during the staircase fatigue test. The effect of test data closed or not on the fatigue strength was analyzed when the fatigue strength was statistically estimated by the staircase method. The results show that when the last-level stress in the staircase chart of unclosed test data was lower than the first effective stress, the statistically estimated fatigue strength after subsequent supplementary of hypothetical staircase chart was also lower than the statistically estimated fatigue strength from the original unclosed fatigue test staircase chart. When the last-level stress of the staircase chart of unclosed test data was higher than the first effective stress, the statistically estimated fatigue strength after subsequent supplementary of hypothetical staircase chart was also higher than the statistically estimated fatigue strength from the original unclosed fatigue test staircase chart. Even if test data was not closed, the fatigue strength statistically estimated from failure events and non-failure events may be equal.
- fatigue strength,
- standard deviation,
- staircase method,
- closed test data

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