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Wood hardness conversion help, please

Started by David B, January 22, 2025, 06:57:49 PM

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David B

I deal with tamarix aphylla  a bit down here. It's similar to cottonwood. The only indication of hardness I can find is this "  The Janka hardness was estimated at ca. 33.7 N/mm2 in the transverse direction ..."

Link :  Microsoft Word - Tamarix-paper _SDU-submitted_.doc

I can't figure out how to convert that spec to some standard numbers so that I can compare to other woods. 

Here is cottonwood and sample of "normal" hardness specs. 

Eastern Cottonwood | The Wood Database (Hardwood)

Thanks 
Machine and welding shop day job, trees after work.

rusticretreater

QuoteThe aim of this work was to determine the main physical and mechanical properties of athel wood (Tamarix aphylla), one of the least studied non-commercial wood species. Wood samples of Tamarix aphylla were collected from a small tree stand in Molyvos coastal area (Lesvos, Greece) and standard test methods were followed on small green specimens. Athel wood's air- and oven dry densities were determined at 0.73 and 0.66 g/cm3, while maximum tangential shrinkage and swelling were approximately 10.8 and 12.1%, respectively. The volumetric shrinkage and swelling were estimated at 14.0 and 15.5%, respectively. Modulus of rupture, modulus of elasticity, compression strength parallel to grain and Janka hardness (perpendicular to grain) values were found to be 88.5 N/mm2, 7533 N/mm2, 40.9 N/mm2 and 33.7 N/mm2, respectively.
https://dergipark.org.tr/en/pub/tjf/issue/20895/224369

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Janka scale, wood hardness - LumberJocks ...
Jan 2, 2010 ยท To convert the United States pound-force (lbf) units to newtons N multiply pound-force by 0.453 592 37 then multiply by 9.80665 (1 standard g in units of m/s2). Janka hardness N = (lbf x 0.453 592 37) x 9.80665 OR multiply ...
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Ianab

The fun of different units of measurement.  :wacky:

What I can make of it, the 33.7 Newtons / mm2 should equate to 3370 N / cm2, which is the usual metric measure of hardness. 

That would be roughly 770 lb/ft, and put the hardness around Sycamore / box Elder or Radiata pine. Quite a bit harder than Cottonwood @ 1900 N

Does it "feel" anything like those woods when you work with it?
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Old Greenhorn

And, just to be clear... How much is that in Euro's? ffcheesy
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Ianab

Quote from: Old Greenhorn on January 26, 2025, 08:59:40 PMAnd, just to be clear... How much is that in Euro's? ffcheesy
I think they use Dinars in it's home range.  ffcheesy
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rusticretreater

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David B

Quote from: Ianab on January 26, 2025, 07:43:17 PMThe fun of different units of measurement.  :wacky:

What I can make of it, the 33.7 Newtons / mm2 should equate to 3370 N / cm2, which is the usual metric measure of hardness.

That would be roughly 770 lb/ft, and put the hardness around Sycamore / box Elder or Radiata pine. Quite a bit harder than Cottonwood @ 1900 N

Does it "feel" anything like those woods when you work with it?

Thank you. I got the same numbers extrapolating/estimating off the Ash in the article.

Radiata would be the only thing I have experience with and I'd say yes. Like I hear about cottonwood, heavy when wet, light when dry. It's definitely not a hard wood.
Machine and welding shop day job, trees after work.

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