An Observation of Direction of Load on Bending Strength of Psedotsuga taxifolia (Douglas fir)

Author: Ezhumalai R., Karthik Ramesh Surapura and Sharma Sukh Dev

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Abstract

Study of stiffness (modulus of elasticity-MOE) and Bending strength/flexural strength (modulus of rupture-MOR) in Psedotsuga taxifolia (Douglas fir) wood on radial and Tangential surface were evaluated. The Tree itself grows to be very large, and yields a large amount of usable lumber and veneer for plywood. It is an incredibly valuable commercial timber, widely used in construction and building purposes. The wood is very stiff and strong due to its weight, and is also among the hardest and heaviest softwoods (dried weight is 510 kg/m3). The strength properties vary with species to species and application of direction of load. Loading direction appreciably affects the bending properties remarkably due to the anisotropic /orthotropic nature of timber. The bending strength of timber when loaded parallel to the direction of load is greater than that of timber loaded perpendicular to the direction of load. So it was very much important to study the direction of loading so that we can use

Keywords

Bending strength, Modulus of Elasticity (MOE), Modulus of Rupture (MOR) and Psedotsuga taxifolia (Douglas fir)

Conclusion

The strength properties vary with species to species and application of direction of load. Loading direction appreciably affects the bending properties remarkably due to the anisotropic /orthotropic nature of timber. The study about Mechanical tests on small clear specimens of Eucalyptus globulus L. were performed in Europe. The best correlations between ultimate stress and modulus of elasticity were found in bending and tension parallel to the grain (Jorge Crespo et al., 2020) and one more study in India shows that Radial direction wood sample of Melia compositae bending strength was more in tangential direction (Ezhumalai et al., 2021). Here in our case, the bending strength of timber when loaded parallel to the direction of load is greater than that of timber loaded perpendicular to the direction of load. The ratio of flexural strength values varied from15% to 17% for Doglas fir. The statistical analysis shows significant difference between radial and tangential direction in MoE an

References

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How to cite this article

Ezhumalai, R., Karthik Ramesh Surapura and Sharma, Sukh Dev (2021). An observation of Direction of load on bending Strength of Psedotsuga taxifolia (Douglas fir). Biological Forum – An International Journal, 13(1): 68-73.