Long creep-recovery behavior of bamboo-based products

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 4 Creep and recovery coefficients of Burgers model

Species	stress level (%)	Creep parameter				Correlation coefficient	Recovery parameter	Correlation coefficient
Species	stress level (%)	ε ₁	ε ₂	β ₃	β ₄	R ²	ε ₄	R ²
BLVL	30	2.51	0.29	0.07	0.0008	0.99	0.62	0.98
BLVL	50	4.17	0.64	0.06	0.0020	0.99	1.63	0.91
GLB	30	3.36	1.07	0.06	0.0013	0.99	0.73	0.97
	50	5.57	2.46	0.05	0.0014	0.99	3.37	0.95
	70	7.25	2.58	0.10	0.0140	0.98	6.77	0.90

ε ₁ initial instantaneous strain, ε ₂ and β ₃ creep components determined by characteristic life and shape parameters, β ₄ irrecoverable creep component, BLVL bamboo-laminated veneer lumber, GLB glue laminated bamboo