Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

França, Frederico José Nistal

Committee Member

Seale, R. Dan

Committee Member

Ross, Robert

Committee Member

Senalik, Christopher

Date of Degree

8-9-2022

Document Type

Dissertation - Open Access

Major

Forest Resources

Degree Name

Doctor of Philosophy (Ph.D)

College

College of Forest Resources

Department

Department of Sustainable Bioproducts

Abstract

The flexural and tensile properties of visually graded southern yellow pine lumber were modeled. Longitudinal and transverse vibration techniques and proof-loading bending tests were used to assess the flexural and tensile properties of southern pine lumber. The properties evaluated were dynamic modulus of elasticity (dMOE), static modulus of elasticity (Eb), tension modulus of elasticity (Et), and ultimate tensile stress (UTS). The tensile properties were evaluated in the direction parallel to the grain. This study presents the results of tests conducted on No. 2 2 × 6 and 2 × 10 southern pine lumber of two different lengths (14 ft. and 16 ft.). The results of the analysis show that nondestructive testing techniques are excellent to assess Et and Eb. Moderate relationships were found between dMOE and UTS and between Eb and UTS. Improvements in the prediction of UTS were done with the inclusion of additional parameters into the model. The combination of dMOE, density, and frequency domain area (FDA) generated the highest coefficient of determination for UTS. The distributions of flexural and tensile properties were analyzed for the goodness of fit. Normal distribution was found for Eb data whereas the lognormal distribution was the best fit for the tensile properties.

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