Acoustic Emission of Bolt-Bearing Testing on Structural Composite Lumbers
Keywords:Acoustic emission (AE), structural composite lumbers, bolted connection, cumulative AE counts, AE count rate, AE signature, bolt-bearing strength
AbstractAcoustic emission (AE) characteristics of full-hole bolt-bearing testing on structural composite lumbers (SCL) including laminated veneer lumber (LVL) and oriented strand lumber (OSL) were investigated. The main conclusion is that AE cumulative counts vs time curves of the tested SCL in this study can be characterized with three distinct regions in terms of AE count rates: Region I with a lower constant count rate, Region II with varied and increased count rates, and Region III with a higher constant count rate. Differences in AE count rates of these three regions occurred between LVL and OSL. Also, within each tested SCL, differences in AE count rates were observed among the three regions. These differences in terms of AE count rates between two tested SCL indicate that different types of wood-based composites might have different AE characteristics in terms of the count rate changes when they are subjected to increased bolt compression load. In other words, these differences in AE characteristics between the two tested materials suggest AE "signatures" do exist for SCL bolt connections.
AF&PA (2001) National design specification (NDS) for wood construction. American Forest & Paper Association, Washington, DC.nAicher S, Hofflin L, Dill-Langer G (2001) Damage evolution and acoustic emission of wood at tension perpendicular to fiber. Holz Roh Werkst 59:104-116.nAndo K, Hirashima Y, Sugihara M (2006) Microscopic processes of shearing fracture of old wood, examined using the acoustic emission technique. J Wood Sci 52:483-489.nAnsell MP (1982) Acoustic emission from softwood in tension. Wood Sci Technol 16:35-58.nASTM (2002) E 1316. Standard terminology for nondestructive examinations. American Society for Testing and Materials, West Conshohocken, PA.nASTM (2004a) D 5456-99a. Standard specification for evaluation of structural composite lumber products. American Society for Testing and Materials, West Conshohocken, PA.nASTM (2004b) D 5764-97a. Standard test method for evaluating dowel-bearing strength of wood and wood-based products. American Society for Testing and Materials, West Conshohocken, PA.nAyarkwa J, Hirashima Y, Ando K, Sasaki Y (2001) Monitoring acoustic emissions to predict modulus of rupture of finger-joints from tropical African hardwoods. Wood Fiber Sci 33(3):450-464.nBeall FC (1985) Relationship of acoustic emission to internal bond strength of wood-based composite panel materials. J Acoustic Emission 4(1):19-29.nBeall FC, Wilcox WW (1987) Relationship of acoustic emission during radial compression to mass loss from decay. Forest Prod J 37(4):38-42.nBodig J, Jayne BA (1982) Mechanics of wood and wood composites. Van Nostrand Reinhold Company Inc., New York, NY. 712 pp.nBucur V (1995) Acoustics of wood. CRC Press, Inc., Boca Raton, FL.nChen Z, Gabbita B, Hunt D (2006) Monitoring the fracture of wood in torsion using acoustic emission. J Mater Sci 41:3645-3655.nDeBaise G, Porter A, Pentoney R (1966) Morphology and mechanics of wood fracture. Materials Research and Standards 6(10):493-499.nGozdecki C, Smardzewski J (2005) Detection of failures of adhesively bonded joints using the acoustic emission method. Holzforschung 59:219-229.nJohanson KW (1949) Theory of timber connections. International Association for Bridge and Structural Engineering 9:249-262.nKnuffel WE (1988) Acoustic emission as strength predictor in structural timber. Holzforschung 42:195-198.nNoguchi M, Ishii R, Fujii Y, Imamura Y (1992) Acoustic emission monitoring during partial compression to detect early stages of decay. Wood Sci Technol 26:279-287.nPorter AW, El-Osta ML, Kusec DJ (1972) Prediction of failure of finger joints using acoustic emission. Forest Prod J 22:74-82.nRaczkowski J, Lutomski K, Molinski W, Wos R (1999) Detection of early stages of wood decay by acoustic emission technique. Wood Sci Technol 33:353-358.nRaczkowski J, Molinski W (1994) Acoustic emission in fracture mechanics of wood. J Theor Appl Mech 2(32):300-322.nRitschel F, Brunner AJ, Niemz P (2013) Nondestructive evaluation of damage accumulation in tensile test specimens made from solid wood and layered wood materials. Compos Struct 95:44-52.nSato K, Fushitani M, Noguchi M (1984) Discussion of tensile fracture of wood using acoustic emissions—Estimation of tensile strength and consideration of AE generation based on fracture mechanics. J Japan Wood Res Soc 30(2):117-123.nSmardzewski J, Gozdecki C (2007) Decohesion of glue bonds in wood connections. Holzforschung 61:291-293.nSoltis LA (1994) Bolted connection research: Present and future. Wood Design Focus 5(2):3-5.n
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