The Quasi-Static Loading Of Local Wood Fiber Filled Rolled Thin Tubes

Mohd Radzai, Said and Amzatul Akmam, Mokhtar (2006) The Quasi-Static Loading Of Local Wood Fiber Filled Rolled Thin Tubes. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The energy absorption capacity of a series of axially crushed tube filled with oil palm fiber is compared with those similar tubes but empty to determine the viability of considering the use of such composites or bimaterials in transportation system especially in automotive application. To that end mild steel tubular specimens with square and rectangular cross-sectional geometries; filled with Empty Fruit Bunch (EFB) fibers and with Oil Palm Frond (OPF) fibers; and some of them were added with water or urea formaldehyde and crush quasi-statically to examine the energy absorption characteristics.The fiber initial densities in the tubes, in the form of dry were stated to start from 150kgm·3 , 200kgm·3 • 250kgm'3 and 300kgm·3. From initial experimental works, the tubes that filled with dry fiber show the best energy absorption in term of specific energy. For final experimental works, nine specimens were cut from each two 6m mild steel tubes for a total of eighteen specimens. All of these specimens were crushed quasi-statically in a load frame (Instron 8858 Universal Testing Machine). In order to ensure that the entire specimens were able to be compared with, a number of measurements were taken. These measurements included length, wall thickness, cross-sectional dimensions, volume and mass. Two important energy measures were examined: the specific energy absorption (SEA) and the ratio of peak load to the average load. The geometry and fibers had a significant effect on the energy absorption but changing the loading rate did not. By considering all parameters involved, it was also found that the rectangular mild steel tubes filled with 300kgm'3 Oil Palm Frond fiber was effective at absorbing energy that others those of them but still may be acceptable. This project was actually continued from the past project on order to validate the experimental data to Finite Element Analysis data. The result is still not really achieved to be compared with but this project can be continued with some modification.

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