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Estimating Janka Hardness From Specific Gravity For Tropical And Temperate Species.pdf

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Preview of Estimating Janka Hardness from Specific Gravity for Tropical and Temperate Species
🔗 Source: mathscinotes.com
📊 Size: 578 KB
👤 Author: Michael C. Wiemann, David W. Green
⬇️ Downloads: 42

Summary

Researchers Wiemann and Green developed regression equations to predict Janka side hardness from specific gravity for tropical and temperate species. Key findings include:

- The hardness-specific gravity relationship is similar for tropical and temperate hardwoods but different for softwoods.
- Equations were developed for green wood and wood at 12% moisture content (MC).
- Green hardness equations (in pounds force, lbf):
- Temperate softwoods: H(lbf) = 1,560(Gg)^1.50, r² = 0.70
- Temperate hardwoods: H(lbf) = 3,500(Gg)^2.17, r² = 0.91
- Tropical hardwoods: H(lbf) = 3,000(Gg)^1.91, r² = 0.90
- All hardwoods: H(lbf) = 3,060(Gg)^1.96, r² = 0.90
- 12% MC hardness equations (in lbf):
- Temperate softwoods: H(lbf) = 2,560(Gg)^1.65, r² = 0.73
- Temperate hardwoods: H(lbf) = 4,470(Gg)^2.14, r² = 0.91
- Tropical hardwoods: H(lbf) = 4,040(Gg)^2.06, r² = 0.94
- All hardwoods: H(lbf) = 4,090(Gg)^2.05, r² = 0.93

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Description

Researchers Wiemann and Green present a method to estimate Janka hardness from specific gravity for both tropical and temperate wood species, published by the USDA Forest Service in 2007.

Technical Information

  • File Format: PDF
  • File Size: 578 KB
  • Pages: 26
  • Language: EN
  • Author: Michael C. Wiemann, David W. Green
  • Total Downloads: 42
  • Last Updated: 3 weeks ago

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