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Axial strength for balsa wood at different densities

What I don't understand are the subscripts under the sigmas (strenghths.) How do I know where the compression (crushing) and tensile strengths are? I'd like to know what represents what. Thank you!

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  • $\begingroup$ What material is this for? Composites, foams? Giving some context for this data would help a lot in answering your question. $\endgroup$ – Involute Dec 10 '16 at 21:26
  • $\begingroup$ I'm sorry, I did put in the caption but it doesn't seem to have shown up. I just added it. $\endgroup$ – Rithwik Sudharsan Dec 10 '16 at 21:35
  • $\begingroup$ typically you would study the text acompanying the table to learn the nomenclature $\endgroup$ – agentp Dec 10 '16 at 22:48
  • $\begingroup$ I have looked through it, and I wrote down all the information there in the caption. Throughout the text the only related phrase is "axial strength." $\endgroup$ – Rithwik Sudharsan Dec 10 '16 at 23:35
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    $\begingroup$ I can assure you the original source of that data defined the symbols. If your source is not adequate Id assume someone copied a table out of context, which is a dangerous thing to do. Perhaps they provided a citation you can track down. $\endgroup$ – agentp Dec 11 '16 at 15:17
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Wood is anisotropic. Its mechanical properties are different in different directions relative to the grain of the wood.

The R, L and T suffixes probably refer to the radial, tangential, and longitudinal directions (defined relative to the tree, when the wood was still growing). See the diagram in http://www.fpl.fs.fed.us/documnts/fplgtr/fplgtr113/ch04.pdf.

I have no idea what the other subscripts might mean. I could guess some of them, but if you are making any serious use of this data, guessing is always the wrong option!

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