LAUSR

Abstract The present paper deals with sampling size related uncertainties for the delayed failure of SiC-based bundles under static fatigue condition. It is shown that 75 tests are required to assess the median lifetime with a 20% error at a given stress/temperature. Extending this work at different stress highlights the error on prediction parameters (classical power law model) for different testing strategies: stress scanning with little repetition or conversely extensive repetition at few stresses. It is shown, for a fixed total number of tests, a mixed approach (inconstant number of repetition) should be preferred to reduce the error.