MECHANO-SORPTIVE CREEP MECHANISM OF BAMBOO-BASED PRODUCTS IN BENDING
Keywords:
mechano-sorptive creep, bamboo laminated veneer lumber, glued laminated bambooAbstract
The phenomenon of mechano-sorptive (MS) creep is critical to structural design. It can result in greater deformation and earlier failure under cyclical moisture conditions. This study focuses on the MS bending creep of bamboo laminated veneer lumber (BLVL) and glued laminated bamboo (GLB). All samples were found to exhibit a large creep increment during moisture cycling compared with samples under constant humidity conditions. Relative creep increased with adsorption and showed a slight increase with desorption. However, in the modified creep, subtracting the elastic and shrinkage-swelling components of the total creep, a substantial decrease in absorption for the BLVL was observed, whereas the adsorption increased for the GLB. The creep limit of BLVL was 1.293 mm, and GLB’s limit was 3.363 mm.
References
Armstrong LD, Kingston RST (1960) Effect of moisture
changes on creep in wood. Nature 185:862-863.
Armstrong LD, Christensen G (1961) Influence of moisture
changes on deformation of wood under stress. Nature
:869-870.
Armstrong LD, Kingston RST (1962) The effect of moisture
content changes on the deformation of wood under
stress. Aust J Appl Sci 18(4):257-276.
Bengtsson C (2001) Mechano-sorptive bending creep
of timber-influence of material parameters. Holz Roh-
Werkst 59:229-236.
Bodig J, Jayne BA (1993) Mechanics of wood and wood
composites. Krieger publishing, Malabar, FL.
Genevaux JM, Guitard D (1988) Anisotropie du
comportement différé: Essai de fluage à température
croissanted’un bois de peuplier. Groupement Scientifique
Rhéologie du Bois, Bordeaux, France. pp. 155-166.
Gibson LJ, Ashby MF (1988) Cellular solids: Structure
and properties. Pergammon Press, New York, NY.
Grossman PUA (1976) Requirements for a model that exhibits
mechano-sorptive behavior. Wood Sci Technol 10:163-168.
Hoffmeyer P, Davidson RW (1989) Mechano-sorptive
creep mechanism of wood in compression and bending.
Wood Sci Technol 23(3):215-227.
Hong S-I, Arima T (1998) Shear creep and mechanosorptive
behavior of nai-plate-jointed laminated veneer
lumber. J Wood Sci 44(3):186-190.
Hunt DG, London UK (1989) Linearity and non-linearity
in mechano-sorptive of softwood in compression and
bending creep. Wood Sci Technol 23(4):323-333.
Hunt DG, Shelton CF (1987) Stable-state creep limit of
softwood. J Mater Sci 6:353-354.
Hunt DG, Shelton CF (1988) Longitudinal moistureshrinkage
coefficients of softwood at the mechanosorptive
creep limit. Wood Fiber Sci 22(3):199-210.
Jennifer G, Kent A, Xu QF (2014) Creep behavior of bamboo.
Construct Build Mater 66(1):79-88.
Nielsen LF (2000) Lifetime and residual strength of wood
subjected to static and variable load. Part II: Applications
and design. Holz Roh-Werkst 58:141-152.
Nielsen LF (2005) On the influence of moisture and load
variations on the strength behavior of wood. Paper
presented at the final COST-E24 Conference on Probabilistic
Models in Timber Engineering.
Ozawa M, Fushitani M, Sato K, Kubo T (1995) Stress
dependence of bending creep behavior of wood
under changing moisture conditions. Mokuzai Gakkaishi
(3):281-288.
Pierce CB, Dinwoodie JM, Paxton BH (1979) Creep in
chipboard: Part 2: The use of fitted response curves for
comparative and predictive purposes. Wood Sci Technol
(4):265-282.
Robert J, Rafike Y, Jill T (1994) The effect of moisture
cycling on creep of small glued laminated beams. Wood
Fiber Sci 26(4):556-562.
Schniewind AP, Lyon DE (1973) Further experiments on
creep-rupture life under cyclic environmental conditions.
Wood Fiber Sci 4(4):334-341.
Srpcic S, Srpcic J, Saje M, Turk G (2009) Mechanical
analysis of glulam beams exposed to changing humidity.
Wood Sci Technol 43:9-22.
Vaessen MJ, Janssen JJA (1997) Analysis of the critical
length of culms of bamboo in four-point bending tests.
Heron 42(2):113-124.
Wang FH (2005) The rheology of wood materials. Northeast
Forestry University Press, Harbin, China (in Chinese).
Wu Q, Milota MR (1995) Rheological behavior of Douglasfir
perpendicular to the grain at elevated temperature.
Wood Fiber Sci 27(3):285-295.
Zhou YG, Masami F (1999) Bending creep behavior
of wood under cyclic moisture changes. J Wood Sci
(2):113-119.
Zhou YG, Masami F (2000) Effect of stress level on bending
creep behavior of wood during cyclic moisture
changes. Wood Fiber Sci 32(1):20-28.
