Some Factors Affecting the Toughness of White Ash

Six white ash (Fraxinus americana L.) trees from three central eastern Maine locations were sampled for toughness testing. The data were grouped by rate of growth (three classes), mode of loading (two classes), and wood class (sapwood or heartwood), with 36 samples, selected by random numbers, in each cell. Analysis of variance indicated that mode of loading (tangential vs. radial face) and rate of growth (rings per inch of radius) were highly significant while wood class was not. Analysis by Duncan’s Multiple Range Test showed that: a) the means of the three classes of growth rate were significantly different at the 1 percent level, toughness decreasing with increasing ring count; b) the mean value for loading on the tangential face was significantly greater (1 percent level) than the mean of the radial face loading; c) there was no significant difference between the means of sapwood samples and heartwood samples. Average toughness value for all samples in all categories was 215 inch-pounds.

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