WITHDRAWAL AND BENDING STRENGTHS OF DOWELS FROM THREE MALAYSIAN TIMBERS

The factors influencing the performance of dowel joints using three Malaysian timbers, nyatoh (species of Sapotaceae), ramin (Gonystylus sp.) and rubberwood (Hevea brasiliensis) were assessed. The effects on withdrawal and bending strengths on dowel species, dowel patterns and depths of dowel insert...

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Veröffentlicht in:Journal of tropical forest science 1993-09, Vol.6 (1), p.74-80
Hauptverfasser: Ahmad, Said, Amin, Ashaari Haji, Ali, Roslan, Tahir, Hilmi Md
Format: Artikel
Sprache:eng
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Zusammenfassung:The factors influencing the performance of dowel joints using three Malaysian timbers, nyatoh (species of Sapotaceae), ramin (Gonystylus sp.) and rubberwood (Hevea brasiliensis) were assessed. The effects on withdrawal and bending strengths on dowel species, dowel patterns and depths of dowel insertion were determined on testing blocks made from nyatoh. Species differences were not detected. Spiral-grooved dowels provided higher withdrawal strength while straight-grooved dowels performed better in bending. Both withdrawal and bending strengths increased with an increase in depth of insertion. In terms of application, dowels made from rubberwood are recommended. Faktor-faktor yang mempengaruhi keupayaan dowel dari tiga jenis kayu kayan Malaysia, nyatoh, ramin dan kayu getah sebagai alat sambungan telah dinilai. Keberkesanan kekuatan lentur dan cabut, corak permukaan dowel dan kedalaman susup dari jenis-jenis tersebut telah dilaksanakan dengan menggunakan kayu nyatoh sebagai blok ujian. Perbezaan antara spesies tidak dapat dikesan. Dowel berpilin memberikan nilai kekuatan cabut yang lebih tinggi manakala dowel dengan corak menegak menghasilkan kekuatan lentur yang lebih baik. Nilai kekuatan cabut dan lentur meningkat apabila kedalaman bertambah susup. Dari segi kegunaan, dowel yang di buat dari kayu getah adalah disyorkan.
ISSN:0128-1283