Premium
THE EFFECT OF SAMPLE SIZE ON THE CONFIDENCE OF ENDURANCE FATIGUE TESTS
Author(s) -
Beretta S.,
Clerici P.,
Matteazzi S.
Publication year - 1995
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1995.tb00147.x
Subject(s) - sample size determination , confidence interval , fatigue limit , diagram , statistics , sample (material) , fatigue testing , scatter plot , structural engineering , materials science , mathematics , engineering , chemistry , chromatography
Experimental determination of the fatigue endurance (S‐N) curve of either a given material or a machine element imposes the choices of sample size and of stress levels to be tested. Since referenced recommendations do not apply when the data include run‐outs or have variable scatter, this paper studies the confidence of fatigue tests, taking into account the effect of sample size and of a statistical model. In this research, a great number of rotary bending fatigue tests were carried out, using a heat treated carbon steel with relevant scatter of fatigue lives. The statistical analysis allowed one to obtain confidence limits of the S‐N diagram estimates and to propose some criteria for a better formulation of test schedules.