<i>Schizolobium Parahyba</i> var. Amazonicum Glulam Classified by Non-destructive Tests

Rosa, Talitha Oliveira; Terezo, Rodrigo Figueiredo; Rios, Polliana D’Angelo; Sampietro, Jean Alberto; Rosa, Gabriel Oliveira

doi:10.1590/2179-8087.120217

Original Article, Wood Science and Technology • Floresta Ambient. 26 (2) • 2019 • https://doi.org/10.1590/2179-8087.120217 linkcopy

Schizolobium Parahyba var. Amazonicum Glulam Classified by Non-destructive Tests

Authorship SCIMAGO INSTITUTIONS RANKINGS

The objectives of this study were to evaluate the relationship between the density and the E_W (modulus of elasticity) values obtained by two non-destructive methods: the accuracy of an expeditious method using a graduated ruler; and the homogenization of elasticity between the methods for glulam elements. In the analysis, displacements were measured with a graduated ruler and an automatic data acquisition system of 136 glulam pieces with corresponding structural size was used. The methods were evaluated by correlations, and the homogenization of elasticity was evaluated by the Tukey test. We found that density does not influence the E_W values obtained by the studied methods, and it is concluded that an expeditious method using a graduated ruler can be used to determine E_W by applying a corrected equation.

Keywords:
planted forest timber; paricá; modulus of elasticity; glulam

Apparent density classes	Measurement methods		P-value
	Ruler	Transducer
	E_w (MPa)	E_w (MPa)
C1			0.3295
(270-300 kg.m^-3)	7,042.62 a	5,140.06 a
C.V.(%)	44.05	35.01
C2			0.0033
(330.1-330 kg.m^-3)	7,899.01 a	5,927.06 b
C.V.(%)	19.55	32.44
C3			0.0147
(330.1-360 kg.m^-3)	8,095.00 a	6,983.30 b
C.V.(%)	14.48	48.81
C4			0.0228
(360.1-390 kg.m^-3)	8,291.54 a	6,904.86 b
C.V.(%)	22.34	29.47
C5			0.5144
(390.1-420 kg.m^-3)	8,538.66 a	8,036.64 a
C.V.(%)	24.74	30.44
C6			0.3141
(420.1-450 kg.m^-3)	8,941.32 a	8,080.84 a
C.V.(%)	19.58	35.51
C7			0.0114
(450.1-480 kg.m^-3)	9,645.94 a	7,296.46 b
C.V.(%)	24.95	34.61
C8			0.1406
(480.1-510 kg.m^-3)	11,451.31 a	9.375.84 a
C.V.(%)	18.91	43.96
Overall mean	8.738 a	7.218 b	0.0000

SPs	E_W (MPa)		R.E. (%)	SPs	E_W (MPa)		R.E. (%)
SPs	Ruler	Transducer	R.E. (%)	SPs	Ruler	Transducer	R.E. (%)
V1	9,351	10,003	-6.52	V17	9,535	9,213	3.49
V2	9,349	8,785	6.43	V18	9,532	9,291	2.60
V3	9,367	8,887	5.41	V19	9,520	9,221	3.25
V4	9,451	8,939	5.73	V20	9,527	9,239	3.12
V5	9,493	8,966	5.88	V21	9,526	9,314	2.28
V6	9,476	8,930	6.12	V22	9,517	9,354	1.75
V7	9,479	8,797	7.76	V23	9,510	9,322	2.01
V8	9,456	8,839	6.97	V24	9,536	9,377	1.70
V9	9,483	8,837	7.32	V25	9,536	9,477	0.63
V10	9,483	8,818	6.34	V26	9,554	9,522	0.35
V11	9,550	8,998	6.13	V27	9,557	9,537	0.21
V12	9,538	9,119	4.60	V28	9,545	9,580	-0.37
V13	9,539	9,147	4.29	V29	9,533	9,623	-0.94
V14	9,547	9,154	4.30	V30	9,553	9,629	-0.79
V15	9,534	9,159	4.09	V31	9,574	9,757	-1.87
V16	9,551	9,212	3.67	V32	9,570	9,816	-2.51
Mean Ruler		9,509 a	Mean Transducer		9,249 b	p-value	0.0002
C.V.(%) Ruler = 0.62				C.V.(%) Transducer = 3.46

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[1] Means followed by the same letter in the row do not differ statistically by the Scott-Knott test with 5% significance. C.V. = coefficient of variation.