Material variability and repetitive member allowable property adjustments in forest products engineering

Steve P. Verrill; David E. Kretschmann

doi:10.2737/FPL-RP-649

Treesearch

Material variability and repetitive member allowable property adjustments in forest products engineering

Informally Refereed

Authors:

Steve P. Verrill, David E. Kretschmann

Year:

2008

Type:

Research Paper

Station:

Forest Products Laboratory

DOI:

https://doi.org/10.2737/FPL-RP-649

Source:

Research Paper FPL-RP-649. Madison, WI: U.S. Department of Agriculture,Forest Service, Forest Products Laboratory. 36 pages.

Download (PDF 1.09 MB)

Download (PDF 1.09 MB): https://research.fs.usda.gov/download/treesearch/30940.pdf

Abstract

It has been argued that repetitive member allowable property adjustments should be larger for high-variability material than for low-variability material. We report analytic calculations and simulations that suggest that the order of such adjustments should be reversed. That is, given the manner in which allowable properties are currently calculated, as the coefficient of variation of the strength distribution of individual elements increases, the upward repetitive member adjustments (if any) of assemblies constructed from these elements should decrease.

Keywords

Assembly, reliability, redundancy, allowable property

Citation

Verrill, Steve; Kretschmann, David. 2008. Material variability and repetitive member allowable property adjustments in forest products engineering. Research Paper FPL-RP-649. Madison, WI: U.S. Department of Agriculture,Forest Service, Forest Products Laboratory. 36 p.