The Forestry Forum

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 (https://www.researchgate.net/profile/George-Mantanis/publication/234102035_PHYSICAL_AND_MECHANICAL_PROPERTIES_OF_ATHEL_WOODTAMARIX_APHYLLA/links/0fcfd50f1b9a9c8c18000000/PHYSICAL-AND-MECHANICAL-PROPERTIES-OF-ATHEL-WOOD-TAMARIX-APHYLLA.pdf)

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) (https://www.wood-database.com/eastern-cottonwood/)

Thanks 

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 (https://dergipark.org.tr/en/pub/tjf/issue/20895/224369)

(https://th.bing.com/th?id=ODLS.94a85685-eb02-4c1f-bbe7-c2df43ac693f&w=32&h=32&qlt=90&pcl=fffffa&o=6&pid=1.2) (https://www.bing.com/ck/a?!&&p=0977ccea7cc00bf0e2377570fadfe0f68a4ee020af85f47963fadf0510e4082dJmltdHM9MTczNzg0OTYwMA&ptn=3&ver=2&hsh=4&fclid=29c66185-8bea-6b88-2c48-72908ae26a8a&psq=how+do+you+cnvert+janka+hardness+from+lbf+to+N&u=a1aHR0cHM6Ly93d3cubHVtYmVyam9ja3MuY29tL3RocmVhZHMvamFua2Etc2NhbGUtd29vZC1oYXJkbmVzcy4xMzE2My8&ntb=1)
LumberJocks Woodworking Forum (https://www.bing.com/ck/a?!&&p=0977ccea7cc00bf0e2377570fadfe0f68a4ee020af85f47963fadf0510e4082dJmltdHM9MTczNzg0OTYwMA&ptn=3&ver=2&hsh=4&fclid=29c66185-8bea-6b88-2c48-72908ae26a8a&psq=how+do+you+cnvert+janka+hardness+from+lbf+to+N&u=a1aHR0cHM6Ly93d3cubHVtYmVyam9ja3MuY29tL3RocmVhZHMvamFua2Etc2NhbGUtd29vZC1oYXJkbmVzcy4xMzE2My8&ntb=1)

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Wood (https://www.bing.com/ck/a?!&&p=0977ccea7cc00bf0e2377570fadfe0f68a4ee020af85f47963fadf0510e4082dJmltdHM9MTczNzg0OTYwMA&ptn=3&ver=2&hsh=4&fclid=29c66185-8bea-6b88-2c48-72908ae26a8a&psq=how+do+you+cnvert+janka+hardness+from+lbf+to+N&u=a1aHR0cHM6Ly93d3cubHVtYmVyam9ja3MuY29tL3RocmVhZHMvamFua2Etc2NhbGUtd29vZC1oYXJkbmVzcy4xMzE2My8&ntb=1)
Janka Hardness (https://www.bing.com/ck/a?!&&p=0977ccea7cc00bf0e2377570fadfe0f68a4ee020af85f47963fadf0510e4082dJmltdHM9MTczNzg0OTYwMA&ptn=3&ver=2&hsh=4&fclid=29c66185-8bea-6b88-2c48-72908ae26a8a&psq=how+do+you+cnvert+janka+hardness+from+lbf+to+N&u=a1aHR0cHM6Ly93d3cubHVtYmVyam9ja3MuY29tL3RocmVhZHMvamFua2Etc2NhbGUtd29vZC1oYXJkbmVzcy4xMzE2My8&ntb=1)

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?

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

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

Janka Schoen!  ffcool

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.