Estimation of the internal shear strength distribution of the element for laminated veneer lumber by nonlinear least-squares method

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 3 The values of parameter for the element estimated strengths by nonlinear least-squares method

Test no.	Distribution		Modulus of elasticity		Shear strength		Correlation coefficient	Residual sum of squares
Test no.	Modulus of elasticity	Shear strength	Parameter 1	Parameter 2	Parameter 1	Parameter 2	Correlation coefficient	Residual sum of squares
1	2PW	LN	13.05 (kN/mm²)	6.04	2.08	0.20	− 0.98	0.07
2	LN	N	2.25	0.22	7.61 (N/mm²)	1.68 (N/mm²)	− 0.95	0.04
3	LN	2PW	2.44	0.22	6.42 (N/mm²)	11.91	0.77	0.04
4	2PW	N	12.16 (kN/mm²)	6.39	8.20 (N/mm²)	0.98 (N/mm²)	− 0.01	0.08
5	LN	LN	2.39	0.21	2.04	0.07	0.64	0.03

N normal distribution, LN log-normal distribution, 2PW 2-parameter Weibull distribution, Parameter 1 average in case of N and LN, scale parameter in case of 2PW, Parameter 2 standard deviation in case of N and LN, shape parameter in case of 2PW