Drvna industrija, Vol. 65 No. 1, 2014.
Izvorni znanstveni članak
https://doi.org/10.5552/drind.2014.1229
An Estimation of Dynamic Modulus of Elasticity in Cantilever Flexural Timber Beams
Mehran Roohnia
; Odjel za znanost i tehnologiju drva i papira, Karaj Branch, Islamsko sveučilište Azad, Karaj-Iran
Sažetak
Due to considerable influence of shear deflection and rotary motion, the modulus of elasticity is hardly obtainable in fixed-free flexurally-excited (cantilever) beams. For isotropic materials, Timoshenko has proposed a set of curves to correct the fixed-free modal frequencies as the radius of gyration and free length; however, its performance for wood was not sufficiently conclusive. In this study, rectangular beams of pine wood were tested in a fixed-free condition, altering the free length to height ratios in a proper extent and comparing them to their reference free-free data in terms of natural frequency and dynamic modulus of elasticity shifts. The equality of two pairs of fixed-free versus free-free data, for both frequency and dynamic modulus, was significantly confirmed. The correlation coefficient between experimental and calculated fixed-free frequencies was high enough, and however the correlation coefficient of the modulus of elasticity was rather low.
Ključne riječi
assessment; cantilever beam; flexural; nondestructive technique (NDT); Timoshenko; vibration; wood
Hrčak ID:
118893
URI
Datum izdavanja:
1.4.2014.
Posjeta: 3.682 *