This research develops a theory of the so called reconstruction method to estimate the
Young?s modulus (E) and modulus of rupture (SR) of coconut logs. The reconstruction method
includes among others; flexure test on small-clear specimens, which were taken from locations
distributed along the horizontal as well as vertical direction inside the logs. Further, the
estimated E and SR were acquired by arranging systematically each of the small clear specimens
as if back in the original location in the logs. The estimation was assisted by mechanical theory,
statistics (best fit multiple regression equations), mathematics (calculus), and geometry
approach. This reconstruction method successfully estimates E and SR of the coconut logs. The
average estimated E and SR value as acquired from tree sample number 1 and 2 were 8,118?
8,596 MPa, and 118?124 MPa, respectively. Those two values were still comparable to common
US wood species used for construction i.e. 6,660?15,000 MPa (for E); and 58?132 MPa (for SR).
Moreover those estimations of E and SR correlated significantly with each other. This again
strengthens the reliability and representativeness of the E and SR values for coconut logs as
acquired using the proposed reconstruction methods.

Creator(s)

• BAHTIAR, E.T.
• NUGROHO, N.
• SURJOKUSUMO, S.

Contributor(s)

-

Publisher

Universitas Kristen Petra; 2010

Language

English

Category

jou – Journal

Sub Category

-

Source

Civil Engineering Dimension, Vol. 12, No. 2, September 2010, 65-72; Bahtiar, E.T. (NA00404147), Nugroho, N. (NA00404146), Surjokusumo, S. (NA00404145)

Subject(s)

• WOOD
• BUILDING, WOODEN

File(s)

• jiunkpe-ns-jou-2010-na00404147-23640-young_modulus-resource1.pdf