Janka hardness using nonstandard specimens
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Author
Contributions
- Begel, Marshall. - Contributor
- Nelson, William. - Contributor
- Forest Products Laboratory (U.S.) - Contributor
Publication
2006 - U.S. Dept. of Agriculture, Forest Service, Forest Product Laboratory, Madison, WI, Wisconsin
Language
English
Word Count
3,250 words, Guess
Page Count
13 pages
Identifiers
- Library of Congress Control Number2006361890
- Open LibraryOL16140962M
Classifications
- LCCMLCM 2006/41138
Description
Janka hardness determined on 1.5- by 3.5-in. specimens (2x4s) was found to be equivalent to that determined using the 2- by 2-in. specimen specified in ASTM D 143. Data are presented on the relationship between Janka hardness and the strength of clear wood. Analysis of historical data determined using standard specimens indicated no difference between side hardness values determined on the radial face as opposed to the tangential. Analysis of historical data also indicated that the relationship between hardness modulus (HM) and Janka hardness (H) may be different for hardwood species than for softwood. Recommendations are given for ensuring that experimental procedures do not bias the results when testing non-standard specimens. The authors caution that if hardness (ASTM D 143) and hardness modulus (ASTM D 1037) are measured simultaneously for each ball penetration, the HM/H ratio may be different than that given in D 1037 because the two standards specify different rates of penetration.
Subjects
Series Statement
- Research note FPL -- RN-303.
- Research note FPL -- 0303.
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