Janka hardness

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Wood Handbook, Chapter 11: Mechanical Properties of …

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Hardness is measured as resistance to indentation using a modified Janka hardness test, measured by the load required to embed an 11.3-mm (0.444-in.) diameter ball to one-half its diameter. Fastener holding strength is the maximum resistance to separate or withdraw a fastener in …

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Wood Handbook, Chapter 11: Mechanical Properties of, Hardness, Janka hardness