• Journal of the Korean Wood Science and Technology
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• v.40 no.6
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• pp.363-369
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• 2012

Shear tests parallel to the grain were conducted on domestic wood samples with different growth ring orientations. Shear strength was dependent on the angles between the direction of growth ring orientation and the applied force. The maximum shear strength showed at the intermediate growth ring orientations. Results of shear tests were also used to modify the formula which had previously been developed to predict the withdrawal strength of screw on the face of lumber. Predicted equations were fitted to the results of previous study with different length of No. 8 screw. Predicted equation was under-predicted the withdrawal strength of 25 and 30 mm length of screw within 8% and over-predicted withdrawal strength of 18 and 38 mm length of screw. A little differences between the predicted by shear strength with different growth ring orientation and observed values was existed.