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Axial strength for balsa wood at different densities

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!

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!

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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What do these sigma subscripts represent?

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!