A Note on The Hankinson Formula
Keywords:
Hankinson Formula, Osgood Formula, grain angle, dog-bonedAbstract
Recent tests at the Weyerhaeuser Company Technology Center were aimed at determining the applicability of the Hankinson Formula for predicting the strength of wood loaded in tension at angles to the grain. Small specimens cut at varying grain angles were loaded in tension at a rate of 0.1 inches per minute. A stress versus grain angle plot of the data revealed that the Osgood Formula, a generalization of the Hankinson Formula, provided a better fit and that both could be applied in tension as well as compression loading.References
Ayres, Q. C. 1920. Crushing strength of southern pine at angles to grain. Eng. News-Record 85(14): 653-654.nKojis, D. D., and R. H. Postweiler. 1953. Allowable loads for common bolts at various angles to the grain for southern yellow pine. For. Prod. J. 3(3):21-26.nMartel, R. R. 1920. Tests of bearing strength of redwood agree with Howe's Formula. Eng. News-Record 85(20):959.nOsgood, W. R. 1928. Compressive stress on wood surfaces inclined to the grain. Eng. News-Record 100(6):243-244.nU.S. Army, Engineering Division. 1921. Investigation of crushing strength of spruce at varying angles of grain. Air Service Information Circular 3(259):3-15.n
