Predicting Mechanical Properties of Southern Pine Lumber with Nondestructive Measurements
Author: Jacob Romer
Publisher:
Published: 2013
Total Pages:
ISBN-13:
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Author: Jacob Romer
Publisher:
Published: 2013
Total Pages:
ISBN-13:
DOWNLOAD EBOOKAuthor: Frederico Jose Nistal Franca
Publisher:
Published: 2017
Total Pages: 80
ISBN-13:
DOWNLOAD EBOOKSouthern pine (SP) lumber is the primary softwood material in the United States. The main procedure during lumber grading process is the identification of the strength reducing characteristics that impacts the modulus of rupture (MOR). Non-destructive evaluation technology can be used to identify higher-stiffness material. This study investigated the use of vibration methods to evaluate the mechanical properties of southern pine lumber. Significant correlations between the properties determined by nondestructive techniques and the static MOE were found. No strong correlations were found for MOR because it is related to the ultimate strength of material, often associated with the existence of localized defects, such as a knot. Non-destructive measurements, visual characteristics, and lumber density were used as independent variables. Linear models were constructed to indirectly estimate the MOE and MOR. The variables selected was dynamic modulus of elasticity (dMOE) to predict MOE. Adding density and knot diameter ratio to the model it was possible to develop a prediction model for MOR. It was possible to improve predictability of strength (MOR) with a combination of non-destructive and knot evaluation.
Author: Ivan Orosz
Publisher:
Published: 1968
Total Pages: 12
ISBN-13:
DOWNLOAD EBOOKThis study suggests grading variables and functions that are capable of better strength predictions than strength ratio or modulus of elasticity alone. It provides well supported bases for improving stress grading of lumber. (Author)
Author: Marly Gabriela Carmona Uzcategui
Publisher:
Published: 2022
Total Pages: 0
ISBN-13:
DOWNLOAD EBOOKThe 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.
Author:
Publisher:
Published: 1986
Total Pages: 156
ISBN-13:
DOWNLOAD EBOOKAuthor: C. C. Gerhards
Publisher:
Published: 1972
Total Pages: 544
ISBN-13:
DOWNLOAD EBOOKAuthor: Forest Service (U S )
Publisher: Government Printing Office
Published: 2015
Total Pages: 176
ISBN-13: 9780160928871
DOWNLOAD EBOOKNature's engineering of wood through genetics, wind, and weather creates a wide variability in wood as a material. Consequently, manufacture and users of wood products are frequently frustrated in dealing with the forest resource. Manufacturers sometimes argue that wood is difficult to consistently process into quality products because of the wide range of properties that exist in this raw material. Users of wood products can be equally frustrated with the performance variability found in finished products. Nondestructive evaluation (NDE) technologies have contributed significantly toward eliminating the cause of these frustrations. NDE technologies have been developed and are currently used in lumber and veneer grading programs that result in engineered materials that have consistent well-defined performance characteristics. This brief volume explores some of the processes that are used to manufacture wood, including green wood technology and provides a bit of history to wood production and its uses too. Other products that may interest you from the US Forest Service can be found at this link: https://bookstore.gpo.gov/agency/819
Author: Robert Jon Ross
Publisher:
Published: 1994
Total Pages: 44
ISBN-13:
DOWNLOAD EBOOKAuthor: Voichita Bucur
Publisher: Springer Science & Business Media
Published: 2013-03-14
Total Pages: 361
ISBN-13: 3662089866
DOWNLOAD EBOOKThis book on the Nondestructive Characterization and Imaging of Wood by Professor Voichita Bucur is truly the most outstanding reference on the subject ever written. Since the origins of mankind, wood has played a key role in the history of humans and other living creatures, ranging from provision of life from trees giving air, heat, light, and food to nourish their bodies to structures to protect them from the elements. Wood has also played a key role in one of the world's primary religions. Nondestructive diagnostics methods have long found application in medi cal practice for examination of the human body in order to detect life threatening abnormalities and permit diagnosis to extend life. Nondestructive testing has been used for many years to insure the safety of machinery, air craft, railroads, tunnels, buildings and many other structures. Therefore, it is timely for a treatise, like the present one, to be written describing how wood can be characterized without employing destructive test methods. Since wood is so valuable to mankind, it is important to know the latest methods to nondestructively characterize wood for all practical applications.
Author: Angela Marie Terry
Publisher:
Published: 1991
Total Pages: 16
ISBN-13:
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