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Official Journal of the Japan Wood Research Society

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

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

Test no. Distribution Modulus of elasticity Shear strength Correlation coefficient Residual sum of squares
Modulus of elasticity Shear strength Parameter 1 Parameter 2 Parameter 1 Parameter 2
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
  1. 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