COMPARISON OF NONDESTRUCTIVE TESTING METHODS FOR EVALUATING NO. 2 SOUTHERN PINE LUMBER: PART A, MODULUS OF ELASTICITY

Authors

  • B. Z. Yang
  • R. D. Seale
  • R. Shmulsky Department of Sustainable Bioproducts Mississippi State University Mississippi State, MS 39762-9820
  • J. Dahlen Warnell School of Forestry and Natural Resources University of Georgia Athens, GA 30602-2152
  • X. Wang USDA Forest Service, Forest Products Laboratory Madison, WI 53726-2398

Abstract

Modulus of elasticity (MOE, or E) is one of the main quality indicators in structural lumber stress grading systems. Due to a relatively high amount of variability in contemporary sawn lumber, it is important that nondestructive evaluation technology be utilized to better discern high-E-value pieces from low-E-value pieces. The research described in this study is from a laboratory test of three nondestructive technologies applied to 343 pieces of visually graded No. 2 southern pine lumber collected across the southeast region of the United States. The evaluated technologies included continuous lumber test in continuous proof bending (Metriguard Model 7200 High Capacity Lumber Tester), transverse vibration (Metriguard E-Computer), and two stress wave tools (Falcon A-Grader and Carter Holt Harvey Director HM200). For each of the nondestructive techniques, results were compared with static E as determined by the four-point static bending tests following ASTM D198-14. In all cases, the nondestructive techniques successfully predicted E for all lumber sizes, with linear regression r2 values ranging from 0.77 to 0.86.

Author Biographies

B. Z. Yang

PhD Candidate

R. D. Seale

Thompson Professor

R. Shmulsky, Department of Sustainable Bioproducts Mississippi State University Mississippi State, MS 39762-9820

Professor

J. Dahlen, Warnell School of Forestry and Natural Resources University of Georgia Athens, GA 30602-2152

Assistant Professor

X. Wang, USDA Forest Service, Forest Products Laboratory Madison, WI 53726-2398

Research Forest Products Technologist

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Published

2015-10-19

Issue

Vol. 47 No. 4 (2015)

Section

Research Contributions

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