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The purpose of this work was to ascertain the influence of the nondestructive testing (NDT) method, as well as the location and number of measuring points, on the correlation between NDT indices and the flexural modulus (MOE) of small clear specimens of aged wood. The MOE of the Tibetan  Populus cathayana  specimens sawed from an ancient floor beam were measured, and multiposition NDT was carried out with a stress wave and resistography detector. Unary and multivariate linear methods and the stepwise regression method were used to discuss the correlation between the NDT indices and MOE. The results indicated that the NDT index of  Mf   , which combined stress wave velocity and microdrilling resistance, had the highest correlation coefficient ( R ) with MOE. When the number of measuring points was increased from 2 to 8,  R  could be increased by up to 180.2%. The stepwise regression method is efficient in determining the optimal combination of variables while avoiding colinearity. Thus, using appropriate NDT indices while considering the texture characteristics of the specimen can effectively improve the MOE prediction accuracy.

Influence of number and position of measuring points on the nondestructive testing method to predict the flexural modulus of aged wood