To implement yield theory into design specifications for engineered nailed connections, some practical estimates of nail yield strength and other properties are needed. This short-term study sampled 1170 nails in five sizes from four locations in the United States. Twelve different manufacturers were represented in the sample. All nails were tested in centerpoint bending and their mechanical properties were determined. MIBANT angle, commonly used for quality control in the pallet nail industry, was also measured.
The results showed that: (a) The pennyweight system of classification is inadequate for identifying nail properties for engineering purposes. (b) Nail yield stress decreases as diameter increases, but elastic modulus is reasonably constant. (c) Variation in yield stress between manufacturers is less than 13% coefficient of variation (COV) for any one size nail, which is generally much greater than the variation found for samples from an individual manufacturer. (d) A normalized MIBANT angle may provide a way to insure a minimal level of nail quality for engineering purposes, but additional research is needed.
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