VARIABILITAS KEKUATAN KAYU PADA POHON MAHONI
| Main Author: | Karnasudirdja, Suparman |
|---|---|
| Other Authors: | Puslitbang Hasil Hutan |
| Format: | Article info application/pdf eJournal |
| Bahasa: | ind |
| Terbitan: |
Pusat Penelitian dan Pengembangan Hasil Hutan
, 2017
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| Subjects: | |
| Online Access: |
http://ejournal.forda-mof.org/ejournal-litbang/index.php/JPHH/article/view/3114 http://ejournal.forda-mof.org/ejournal-litbang/index.php/JPHH/article/view/3114/2232 |
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<dc schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd"><title lang="id-ID">VARIABILITAS KEKUATAN KAYU PADA POHON MAHONI</title><creator>Karnasudirdja, Suparman</creator><subject lang="id-ID">Mahogany; Variation; combination; compression strengths</subject><description lang="id-ID">A  study  on a  variation of  bending  and compression  parallel to the grain strength  in Mahogany  (Swietenia mahogany) tree  has been  under  taken.  The material  consisted of 5  trees, each  of  which was represented by 4 bolt  taken  respectively from  near tree  base, at middle  half and  upper end of  the merchantable bole.  The test pieces  were then drawn from  each bolt  following   the  cruciform  pattern  of  the  ASTM   D14362 procedure. Using this pattern, 221  and  197  test specimens were respectively obtained  for  the  bending  and compression test.  The  result  shows  that  the  tree averages of  the  bending strength ranges from  90 - 110% of  the species  maan value, the cardinal point  averages from  100 -101% and the position within tree (bolt)  averages from  97 - 102%, As has been anticipated the tree averages are significantly different in both  the bending  and  compression strengths. Computation of the precision  of estimates  of the species  mean in term  of the probable limit  of  error (PLE) as percentage of  the species  mean  within 95%  confidence band as suggested by Pearson (1952)  indicates  an error of  9,51% and  12,44%   for  respectively the bending  and  compression   strength.  Values  of  the probable limit of error PLE were then calculated  using various combination of number of test pieces per tree and number  of  trees,  and  the result  compared   with   those  obtained   from  previous test  using  Agathis lorantifolia and  Schima  wallichii  tree species.  It shows  that  for structural and  non-structural purposes at leat 10 trees per species,  and 5-10 specimens  per  tree should  be employed   in future  strength  test in order to obtain  an error of  between  5 -10%. This is definitely an advantage  compared with  the  current  procedure.</description><publisher lang="id-ID">Pusat Penelitian dan Pengembangan Hasil Hutan</publisher><contributor lang="id-ID">Puslitbang Hasil Hutan</contributor><date>2017-08-09</date><type>Journal:Article</type><type>Other:info:eu-repo/semantics/publishedVersion</type><type>Other:</type><type>Other:</type><type>File:application/pdf</type><identifier>http://ejournal.forda-mof.org/ejournal-litbang/index.php/JPHH/article/view/3114</identifier><identifier>10.20886/jphh.1985.2.1.4-9</identifier><source lang="en-US">Jurnal Penelitian Hasil Hutan; Vol 2, No 1 (1985): Jurnal Penelitian Hasil Hutan; 4-9</source><source lang="id-ID">Jurnal Penelitian Hasil Hutan; Vol 2, No 1 (1985): Jurnal Penelitian Hasil Hutan; 4-9</source><source>2442-8957</source><source>0216-4329</source><language>ind</language><relation>http://ejournal.forda-mof.org/ejournal-litbang/index.php/JPHH/article/view/3114/2232</relation><rights lang="en-US">Copyright (c) 2017 Jurnal Penelitian Hasil Hutan</rights><rights lang="en-US">http://creativecommons.org/licenses/by-nc-sa/4.0</rights><recordID>--ejournal.forda-mof.org-ejournal-litbang-index.php-index-oai:article-3114</recordID></dc>
|
| language |
ind |
| format |
Journal:Article Journal Other:info:eu-repo/semantics/publishedVersion Other Other: File:application/pdf File Journal:eJournal |
| author |
Karnasudirdja, Suparman |
| author2 |
Puslitbang Hasil Hutan |
| title |
VARIABILITAS KEKUATAN KAYU PADA POHON MAHONI |
| publisher |
Pusat Penelitian dan Pengembangan Hasil Hutan |
| publishDate |
2017 |
| topic |
Mahogany Variation combination compression strengths |
| url |
http://ejournal.forda-mof.org/ejournal-litbang/index.php/JPHH/article/view/3114 http://ejournal.forda-mof.org/ejournal-litbang/index.php/JPHH/article/view/3114/2232 |
| contents |
A study on a variation of bending and compression parallel to the grain strength in Mahogany (Swietenia mahogany) tree has been under taken. The material consisted of 5 trees, each of which was represented by 4 bolt taken respectively from near tree base, at middle half and upper end of the merchantable bole. The test pieces were then drawn from each bolt following the cruciform pattern of the ASTM D14362 procedure. Using this pattern, 221 and 197 test specimens were respectively obtained for the bending and compression test. The result shows that the tree averages of the bending strength ranges from 90 - 110% of the species maan value, the cardinal point averages from 100 -101% and the position within tree (bolt) averages from 97 - 102%, As has been anticipated the tree averages are significantly different in both the bending and compression strengths. Computation of the precision of estimates of the species mean in term of the probable limit of error (PLE) as percentage of the species mean within 95% confidence band as suggested by Pearson (1952) indicates an error of 9,51% and 12,44% for respectively the bending and compression strength. Values of the probable limit of error PLE were then calculated using various combination of number of test pieces per tree and number of trees, and the result compared with those obtained from previous test using Agathis lorantifolia and Schima wallichii tree species. It shows that for structural and non-structural purposes at leat 10 trees per species, and 5-10 specimens per tree should be employed in future strength test in order to obtain an error of between 5 -10%. This is definitely an advantage compared with the current procedure. |
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Kementerian Lingkungan Hidup dan Kehutanan Republik Indonesia |
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475 |
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Perpustakaan Kementerian Lingkungan Hidup dan Kehutanan RI |
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Indonesian Journal of Forestry Research |
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Kehutanan Lingkungan Pertanian |
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BOGOR |
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JAWA BARAT |
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IOS3429 |
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2017-08-20T01:13:05Z |
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