Numerical correction of Weibull function's nomogram for three-point bending test

摘要

In this technical note the stress field in the three-point bending test is calculated by means of the finite element method. The emphasis is placed in the distortion, with regard to the elementary theory of beams, of the tensile stress in the vicinity of the application point of load. With the numerical values of the stress field calculated, the Evans function is corrected and new Weibull function's nomograms are obtained to evaluate the Weibull parameters. The new nomograms predict lower values of sigma_L and sigma_0, while the value of m is not modified.